Accession Number : AD0784767

Title :   Formulation and Comparison of Instantaneous Distortion Indices for Assessing Compressor Stall.

Descriptive Note : Master's thesis,


Personal Author(s) : Vann,John Lloyd

Report Date : JUN 1974

Pagination or Media Count : 102

Abstract : 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 Master's thesis. The program is expanded in this thesis to compute and compare the three indices. (Author)

Descriptors :   *Turbojet engines, *Axial flow compressors, *Stalling, Distortion, Vortices, Surges, Computer programs, Theses

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE