Communications Project

Document Type:Master's Thesis
Name:Joseph E. Cahill
Title:Identification and Evaluation of Loss and Deviation Models for use in Transonic Compressor Stage Performance Prediction
Degree:Master of Science
Department:Mechanical Engineering
Committee Chair: Dr. W.F. O'Brien
Committee Members:Dr. A.A. Hale
Dr. C.L. Dancey
Keywords:Loss, Deviation, Axial Compressors, Transonic
Date of defense:September 22, 1997
Availability:Release the entire work immediately worldwide.


The correlation of cascade experimental data is one method for obtaining compressor stage characteristics. These correlations specify pressure loss and flow turning caused by the blades. Current open literature correlations used in streamline curvature codes are inadequate for general application to high-speed transonic axial-flow compressors. The objective of this research was to investigate and evaluate the available correlations and ultimately discover sets of correlations which best fit the empirical data to be used in streamline curvature codes. Correlations were evaluated against experimental data from NASA Rotor 1-B and NASA Stage 35. It was found that no universal set of correlations was valid for minimum-loss point predictions. The Bloch shock loss model showed promising results in the stall regime for supersonic relative inlet Mach numbers. The Hearsey and Creveling off-minimum-loss deviation angle prediction performed consistently better than all other correlations tested.

List of Attached Files

Etd1.pdf Etd2.pdf

The author grants to Virginia Tech or its agents the right to archive and display their thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. The author retains all proprietary rights, such as patent rights. The author also retains the right to use in future works (such as articles or books) all or part of this thesis or dissertation.