Technical report | An Investigation into Performance Modelling of a Small Gas Turbine Engine

Abstract

 A small gas turbine performance modelling and testing project has been completed as part of a Divisional Enabling Research Program (DERP). The main objective of the program was to enhance DSTO's capability in understanding and modelling the thermodynamic and performance characteristics of gas turbine engines. Secondary objectives of the program included the investigation of thrust augmentation technologies and infrared suppression modelling and analysis. This report presents the results of both numerical and experimental investigation into engine performance simulation. It outlines the different tools and techniques used in modeling engine component behaviour and discusses their advantages and disadvantages. The results of two different tests designed to explore engine operating regions close to compressor stall and surge is presented.

Exeutive Summary

A small gas turbine performance modelling and testing project has been completed as part of a Divisional Enabling Research Program (DERP). The main objective of the program was to enhance DSTO's capability in understanding and modelling the thermodynamic and performance characteristics of gas turbine engines. Secondary objectives of the program included the investigation of thrust augmentation technologies and infrared suppression modelling and analysis.

Engine performance modelling was conducted using commercial software and an in-house developed code. The engine performance model of the small gas turbine engine was validated through engine testing. A number of non-standard tests were also conducted in order to "stress" the engine and compare results with the engine performance model and to provide an insight into thrust augmentation options. A number of auxilary tools and techniques were developed during this process.

The primary objectives of the project were successfully reached. An engine performance modelling tool was developed and validated and different tools and techniques were evaluated. Infrared suppression related studies were also conducted.

A number of other projects have been initiated based on the tools, technologies and processes developed during this project. An alternate fuels research program will directly utilise the testing infrastructure, tools and know-how. A PhD into infrared prediction technologies is currently under way and a final year thesis completed. A feasibility study into compressor and turbine performance testing will be completed. A number of numerical tools will continue to be developed to aid and improve the modelling of engine performance components.

The tools, techniques and conclusions derived from this project have direct impact on Australian Defence Organisation outcomes. Engine performance modelling is critical for ADF gas turbine engine performance analysis and requirements, structural, thermal and creep assessment, performance degradation studies, infrared suppression technologies to name a few. The tools and techniques developed in this project will be directly used to model the performance of ADF gas turbine engines.