PIV Measurements of the Flow Field in the Rotor Tip Region of a Compressor

Researchers at Johns Hopkins University (Prof. Joseph Katz) have conducted a set of experiments under a NASA Research Announcement (NRA), that measure and demonstrate the effect of varying rotor tip clearances in a low-speed axial compressor. Detailed stereo PIV measurements of the tip flow field were obtained in their optically index-matched facility. To help understand the complex flow phenomena associated with the tip clearances, the researchers used rotor and stator blades based on the first 1.5 stages of the Low-Speed Axial Compressor (LSAC) at NASA Glenn Research Center. Various casing treatments, semicircular, U-shape and S-shape grooves, were then tested to determine the effect on the large tip clearance flow and their effect to the onset of stall.


For the smooth wall test cases, data was collected at both high flow coefficient, φ = 0.35, and low flow, φ = 0.25, which also represented pre-stall conditions. The tip clearance over the rotor were set (and measured) to be 0.49% (small tip gap) and 2.3% (large tip gap) of the total axial chord.


Test data with the semi-circle casing treatment were obtained for three flow coefficients: φ = 0.25, φ = 0.35 and φ = 0.38 (design condition), and data collected with the U-groove and S-groove casing treatments were at a flow coefficient of φ = 0.25 and φ = 0.38.


The tip clearance for all casing treatment cases were measured to be 1.8 mm


Downloadable geometry and data files are displayed by clicking the Show Files button. Geometry files in .stl, .stp and .igs formats are listed on top for each casing treatment change. There is a design change in rotor geometry starting at case 3 and remains the same through case 34. JHU PIV data are stored in MATLAB binary *.mat files and are listed by a chordwise location (s/c) of the measurement plane for each test condition/configuration. The *.mat file contains several arrays including velocity, vorticity, TKE and turbulence quantities. A description of all arrays can be found here. For more detail about test cases, configurations, measurement planes and inlet velocity profiles you can download the xlsx file, Supplemental_info.xlsx


DATASET DICTIONARY

Homepage https://nasa.github.io/JHU-PIV-data/
Data POC Barb Lucci
Contact Email lucci@nasa.gov
Publisher National Aeronautics and Space Administration
Program Code 026:024
Keywords tip leakage, tip vortex, compressor, secondary flow, velocity, turbulent flow

1 Smooth Wall, Small Tip Gap, Low Flow & Geometry Files

Download URL File Format
Rotor geometry (Casing radius = 228.6mm)​ binary .stl file
Rotor geometry​ ascii .stp file
Rotor geometry​ ascii .igs file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

2 Smooth Wall, Small Tip Gap, High Flow

Download URL File Format
s/c .328​ binary .mat file
s/c .437​ binary .mat file
s/c .546 binary .mat file
s/c .655​ binary .mat file
s/c .764​ binary .mat file
s/c .873​ binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

3 Smooth Wall, Large Tip Gap, Low Flow & Geometry Files

Download URL File Format
IGV-Rotor-Stator ascii .stp file
Rotor geometry (Casing radius = 228.6mm)​ binary .stl file
Rotor geometry​ ascii .stp file
Rotor geometry​ ascii .igs file
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

4 Smooth Wall, Large Tip Gap, High Flow

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

5 Semi-circle Grooves, Low Flow, Theta 1 & Geometry Files

Download URL File Format
Rotor geometry​ binary .stl file
Rotor geometry​ ascii .stp file
Rotor geometry​ ascii .igs file
Casing geometry​ binary .stl file
Casing geometry​ ascii .igs file
s/c 0​ binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
s/c .927 binary .mat file
s/c .982 binary .mat file
s/c 1.036 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

6 Semi-circle Grooves, Low Flow, Theta 2

Download URL File Format
s/c 0​ binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
s/c .927 binary .mat file
s/c .982 binary .mat file
s/c 1.036 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

7 Semi-circle Grooves, Low Flow, Theta 3

Download URL File Format
s/c 0​ binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
s/c .927 binary .mat file
s/c .982 binary .mat file
s/c 1.036 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

8 Semi-circle Grooves, L1 at Theta2, Flow = 0.35

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

9 Semi-circle Grooves, L1 at Theta2, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

10 Semi-circle Grooves, L2 at Theta2, Flow = 0.35

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

11 Semi-circle Grooves, L2 at Theta2, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

12 Semi-circle Grooves, Radial Plane R1, Flow = 0.25

Download URL File Format
s/c 0​ binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
s/c .927 binary .mat file
s/c .982 binary .mat file
s/c 1.036 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

13 Semi-circle Grooves, Radial Plane R1, Flow = 0.35

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

14 Semi-circle Grooves, Radial Plane R1, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

15 Semi-circle Grooves, Radial Plane R2, Flow = 0.35

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

16 Semi-circle Grooves, Radial Plane R2, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.m

See sample plot & figures

17 U Grooves, M1 plane, Flow = 0.25 & Geometry Files

Download URL File Format
Rotor & U groove geometry​ ascii .igs file
Rotor & U groove geometry​ ascii .stp file
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

18 U Grooves, M2 plane, Flow = 0.25

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

19 U Grooves, R1 plane, Flow = 0.25

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

20 U Grooves, R2 plane, Flow = 0.25

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

21 U Grooves, M1 plane, Flow = 0.38

20Release.rar
Download URL File Format
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

22 U Grooves, M2 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

23 U Grooves, R1 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

24 U Grooves, R2 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

25 U Grooves, Axial Plane s/c=0.086

Download URL File Format
Flow 0.25​ binary .mat file
Flow 0.38 binary .mat file
Plot Code 025 MATLAB/.zip
Plot Code 038 MATLAB/.zip

See sample plot & figures

26 S Grooves, M1 plane, Flow = 0.25 & Geometry Files

Download URL File Format
Rotor & S groove geometry​ ascii .igs file
Rotor & S groove geometry​ ascii .stp file
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

27 S Grooves, M2 plane, Flow = 0.25

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

28 S Grooves, R1 plane, Flow = 0.25

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

29 S Grooves, R2 plane, Flow = 0.25

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

30 S Grooves, M1 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

31 S Grooves, M2 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109, with turbulence terms binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328, with turbulence terms binary .mat file
s/c .437, with turbulence terms binary .mat file
s/c .546, with turbulence terms binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

32 S Grooves, R1 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

33 S Grooves, R2 plane, Flow = 0.38

Download URL File Format
s/c -.163​ binary .mat file
s/c -.109 binary .mat file
s/c -.055 binary .mat file
s/c 0 binary .mat file
s/c .055 binary .mat file
s/c .109 binary .mat file
s/c .163 binary .mat file
s/c .218 binary .mat file
s/c .328 binary .mat file
s/c .437 binary .mat file
s/c .546 binary .mat file
s/c .655 binary .mat file
s/c .764 binary .mat file
s/c .873 binary .mat file
Plot Code MATLAB/.zip

See sample plot & figures

34 S Grooves, Axial Plane s/c=0.086

Download URL File Format
Flow 0.25​ binary .mat file
Flow 0.38 binary .mat file
Plot Code 025 MATLAB/.zip
Plot Code 038 MATLAB/.zip

See sample plot & figures

35 Cavitation Video, Smooth Wall, Small Gap

Download URL File Format
Flow 0.25​ Microsoft .avi file
Flow 0.35 Microsoft .avi file

36 Cavitation Video, Smooth Wall, Large Gap

Download URL File Format
Flow 0.24 Stall Microsoft .avi file
Flow 0.25 Prestall 1 Microsoft .avi file
Flow 0.25 Prestall 2 Microsoft .avi file
Flow 0.35 Microsoft .avi file

37 Cavitation Video, Semi-Circle, Large Gap

Download URL File Format
Flow 0.14 Stall Microsoft .avi file
Flow 0.15 Prestall Microsoft .avi file
Flow 0.20 Microsoft .avi file
Flow 0.24 Microsoft .avi file
Flow 0.25 Microsoft .avi file
Flow 0.35 Microsoft .avi file
Flow 0.38 Microsoft .avi file

Publications


Measurements and Characterization of Turbulence in the Tip Region of an Axial Compressor Rotor, 2017 (PDF)

An Experimental Study of Stall Suppression and Associated Changes to the Flow Structures in the Tip Region of an Axial Low Speed Fan Rotor by Axial Casing Grooves, 2017 (PDF)

Visualizations of Flow Structures in the Rotor Passage of an Axial Compressor at the Onset of Stall, 2017 (PDF)

On the Interations of a Rotor Blade Tip Flow with Axial Casing Grooves in an Axial Compressor near the Best Efficiency Point, 2018 (PDF)

Challenges in Modeling of Turbulence in the Tip Region of Axial Turbomachines, 2019 (PDF)

Systematic Experimental Evaluations aimed at Optimizing the Geometry of Axial Casing Groove in a Compressor, 2019 (PDF)

On the Effects of Tip Clearance and Operating Condition on the Flow Structures Within an Axial Turbomachine Rotor Passage, 2019 (PDF)

Effects of Axial Casing Grooves on the Structure of Turbulence in the Tip Region of an Axial Turbomachine Rotor, 2020 (PDF)

Effect of Axial Casing Groove Geometry on Rotor-Groove Interactions in the Tip Region of a Compressor (PDF)