Mechanism study of performance enhancement in a subsonic axial flow compressor with recirculating casing treatment

The improvements in both compressor efficiency and stability have been observed in a subsonic axial flow compressor with recirculating casing treatment. The study aims to understand the underlying flow mechanisms of the beneficial effect on the compressor efficiency of recirculating casing treatment. The recirculating casing treatment was investigated experimentally and numerically. In the experiment, static pressure fluctuations over the rotor tip were measured with fast-response pressure transducers. Whole-passage time-accurate simulations were also implemented to help in understanding the flow details. The unsteadiness of double-leakage flow and its effect on the loss generated at the rotor tip were discussed in detail for the solid casing. The effect of recirculating casing treatment on the double-leakage flow related loss was subsequently investigated. The results indicate that the double leakage flow is a main loss source in the rotor tip region. The double-leakage flow is completely unsteady, which induces a cyclical fluctuation of the amount of loss generated in the rotor tip region for the solid casing. With the recirculating casing treatment installed, the high-energy jet created in recirculating loops changes the unsteady characteristics of double-leakage flow by getting it diffused over the rotor tip gap along the chordwise direction, which results in the loss fluctuation that is dominated by the high-energy jet rather than the unsteadiness of double-leakage flow. The double-leakage flow is also pushed downstream by the jet and the amount is reduced when it passes through the recirculating loops. The effect of recirculating casing treatment on the double-leakage flow is primarily responsible for the improvement in the compressor efficiency.

[1]  Michael D. Hathaway.  Passive Endwall Treatments for Enhancing Stability , 2007 .

[2]  Paul C. Ivey,et al.  Performance enhancement in transonic axial compressors using blade tip injection coupled with casing treatment , 2005 .

[3]  Edward M. Greitzer,et al.  Active suppression of aerodynamic instabilities in turbomachines , 1989 .

[4]  Jakob Hermann,et al.  High Pressure Compressor Stabilization by Controlled Pulsed Injection , 2012 .

[5]  Michael D. Hathaway,et al.  Compressor Stability Enhancement Using Discrete Tip Injection , 2000 .

[6]  Roland Matzgeller,et al.  Modeling of Discrete Tip Injection in a Two-Dimensional Streamline Curvature Method , 2012 .

[7]  Baojie Liu,et al.  Modeling of the double leakage and leakage spillage flows in axial flow compressors , 2014 .

[8]  C. C. Koch,et al.  Experimental evaluation of outer case blowing or bleeding of single stage axial flow compressor, part 6 Final report , 1970 .

[9]  Wuli Chu,et al.  Parametric Investigation of Circumferential Grooves on Compressor Rotor Performance , 2010 .

[10]  Ivor Day,et al.  Experiments in active control of stall on an aeroengine gas turbine , 1998 .

[11]  W. Chu,et al.  The effect of injector size on compressor performance in a transonic axial compressor with discrete tip injection , 2014 .

[12]  Qingpeng Li,et al.  Investigation of Pre-Stall Behavior in an Axial Compressor Rotor—Part I: Unsteadiness of Tip Clearance Flow , 2012 .

[13]  S. Song,et al.  Injection profile effects on low speed axial compressor stability enhancement , 2011 .

[14]  Alan H. Epstein,et al.  Active Stabilization of Rotating Stall and Surge in a Transonic Single Stage Axial Compressor , 1997 .

[15]  Hossein Khaleghi.  Effect of discrete endwall recirculation on the stability of a high-speed compressor rotor , 2014 .

[16]  Jichao Li,et al.  The Dual Mechanisms and Implementations of Stability Enhancement With Discrete Tip Injection in Axial Flow Compressors , 2015 .

[18]  Albert Kammerer,et al.  Parametric study of tip injection in an axial flow compressor stage , 2007 .

[20]  Michael D. Hathaway,et al.  Self-Recirculating Casing Treatment Concept for Enhanced Compressor Performance , 2002 .

[21]  Dennis E. Culley,et al.  Compressor Stall Control Through Endwall Recirculation , 2004 .

[22]  J. Denton.  Loss Mechanisms in Turbomachines , 1993 .

[23]  B. T. Sirakov,et al.  Effect of Upstream Unsteady Flow Conditions on Rotor Tip Leakage Flow , 2002 .

[24]  Yanhui Wu,et al.  Numerical Investigation on the Effects of Circumferential Coverage of Injection in a Transonic Compressor With Discrete Tip Injection , 2014 .

[25]  Edward M. Greitzer,et al.  1997 Best Paper Award—Controls and Diagnostics Committee: Active Stabilization of Rotating Stall and Surge in a Transonic Single-Stage Axial Compressor , 1998 .

[26]  M. Boroomand,et al.  A numerical study of the effects of injection velocity on stability improvement in high-speed compressors , 2008 .

[27]  INVESTIGATION OF UNSTEADY COMPRESSOR FLOW STRUCTURE WITH TIP INJECTION USING PARTICLE IMAGE VELOCIMETRY , 2011 .

[28]  B. F. Beacher,et al.  The Impact of Forward Swept Rotors on Tip Clearance Flows in Subsonic Axial Compressors , 2004 .

[29]  Frank E. Marble,et al.  Endwall Blockage in Axial Compressors , 1998 .

[30]  Ivor Day,et al.  Self-Regulating Casing Treatment for Axial Compressor Stability Enhancement , 2011 .

[31]  Konrad Vogeler,et al.  Rotating Instabilities in an Axial Compressor Originating From the Fluctuating Blade Tip Vortex , 2000 .

[33]  Hong Yang,et al.  Numerical Investigation of Casing Treatment Mechanisms With a Conservative Mixed-Cell Approach , 2003 .

[34]  Gang Xu,et al.  Micro Air Injection and Its Unsteady Response in a Low-Speed Axial Compressor , 2002 .

[35]  Feng Lin,et al.  Numerical Investigation on the Self-Induced Unsteadiness in Tip Leakage Flow for a Transonic Fan Rotor , 2010 .

[36]  John D. Denton,et al.  The 1993 IGTI Scholar Lecture: Loss Mechanisms in Turbomachines , 1993 .

[37]  Ivor Day,et al.  Experiments in active control of stall on an aeroengine gas turbine , 1999 .

[38]  Carsten Clemen,et al.  Active Flow Control in a Single-Stage Axial Compressor Using Tip Injection and Endwall Boundary Layer Removal , 2008 .