UNSTEADY 3D FLOW IN A SINGLE-STAGE TRANSONIC FAN. PART I: UNSTEADY ROTOR EXIT FLOW FIELD

Detailed unsteady aerodynamic measurements have been taken in a single-stage transonic fan with a very high stator-hub loading. 2D dynamic yawmeter probes, capable of measuring mean and fluctuating levels of stagnation pressure, static pressure and yaw angle have been traversed at rotor exit, and downstream of the stator along with several types of pneumatic 3D probe. Part I of this paper describes the dynamic yawmeters and their performance, and presents ensemble-averaged stagnation pressure and random stagnation pressure unsteadiness measurements taken at rotor exit. These are used to illustrate the salient features of the rotor flow field, and the effects of compressor aerodynamic loading. Part II presents measurements taken at stator exit.Copyright © 1994 by ASME

[1]  Wing Ng,et al.  Flow Randomness and Tip Losses in Transonic Rotors , 1993 .

[2]  Roger W. Ainsworth,et al.  The Use of Semi-Conductor Sensors for Blade Surface Pressure Measurement in a Model Turbine Stage , 1991 .

[3]  Alan H. Epstein,et al.  Vortex shedding in high-speed compressor blade wakes , 1988 .

[4]  Alan H. Epstein,et al.  Blade Row Interaction Effects on Compressor Measurements , 1993 .

[5]  Paul C. Ivey,et al.  Endwall Effects at Two Tip Clearances in a Multistage Axial Flow Compressor With Controlled Diffusion Blading , 1993 .

[6]  R. P. Dring,et al.  An Investigation of Axial Compressor Rotor Aerodynamics , 1982 .

[7]  Alan H. Epstein,et al.  Unsteady Losses in Transonic Compressors , 1985 .

[8]  M A Cherrett,et al.  3D Pneumatic and 2D Dynamic Probes: Their Development and Subsequent Use in a Transonic Fan , 1992 .

[9]  H. E. Gallus,et al.  Three-Dimensional Wake Decay Inside of a Compressor Cascade and Its Influence on the Downstream Unsteady Flow Field: Part I—Wake Decay Characteristics in the Flow Passage , 1991 .

[10]  M. A. Cherrett,et al.  Unsteady Viscous Flow in a High Speed Core Compressor , 1992 .

[11]  H. E. Gallus,et al.  Three-Dimensional Wake Decay Inside of a Compressor Cascade and Its Influence on the Downstream Unsteady Flow Field: Part II—Unsteady Flow Field Downstream of the Stator , 1991 .

[12]  M. A. Cherrett,et al.  Three-Dimensional Flow in a Highly Loaded Single-Stage Transonic Fan , 1993 .

[13]  Motoo Kuroumaru,et al.  Structure of Tip Clearance Flow in an Isolated Axial Compressor Rotor , 1989 .

[14]  A. Epstein,et al.  Unsteady design-point flow phenomena in transonic compressors , 1986 .