Evaluating Complex Inlet Distortion With a Parallel Compressor Model: Part 2—Applications to Complex Patterns

Abstract

This paper is the second paper (Part 2) in a companion set and presents results of computer simulations using a parallel compressor model developed with the extended concepts presented in the previous paper (Part 1). The computer model, constructed using the parallel compressor theory with extensions, has been exercised and compared with test results from several gas turbine engines to demonstrate the usefulness of this simulation technique. Distortion patterns used in the tests were created using distortion-generator devices such as distortion screens. A technique to simplify complex distortion patterns through approximate means is presented. This simplification is implemented based upon the flow physics of the compression system, thus allowing the model to better represent the distortion pattern while providing minimal impact on the simulation output and the comparison to the test results. The usefulness of the extended parallel compressor model is demonstrated from its ease of use, simplicity, and ability for quick turn-around of results. Applying a timely analysis capability using the demonstrated parallel compressor model provides an additional physical understanding of the effects of complex distortion on compression system operation.