Formulation and Comparison of Instantaneous Distortion Indices for Assessing Compressor Stall.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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This thesis examines the problem of predicting distortion induced stall in an axial flow compressor. Three instantaneous distortion indices are used on the data presented. The data consist of eleven stall events run at 2.5 Mach by NASA Lewis on a J85-GE-13 turbojet engine. The three indices used include two indices based on vorticity and developed at the Naval Postgraduate School. The third index was developed by Pratt and Whitney and is based on total pressure distributions. The three indices are compared by visual means using computer plots and are also compared by using a simple statistical approach. The computer program used was first developed by Shoemaker in his Masters thesis. The program is expanded in this thesis to compute and compare the three indices. Author
- Jet and Gas Turbine Engines