A new approach to off-design performance analysis of gas turbine engines and its application

This paper presents a new method to formulate the problem of simulating and off-design performance analysis of gas turbine engines and organizing this problem to solve. This method, without any simplification, follows an identical procedure for off-design analysis of all configurations of gas turbines. The method is based on solving an equations system, modular and flexible, and requires the least user experience. Details on the formulation of characteristic and compatibility equations and subsequently formation and details on solving the equations system were presented. The performance of the Olympus-HP micro turbojet engine was obtained from this method validated against test rig and manufacturer results. As an application, the off-design performance of a double-shaft gas turbine was investigated, which is configured from the Olympus-HP core and power turbines that are corresponding to the loads. A centrifugal compressor and a fan with 45 kW consuming power with different design speeds were utilized as the load. The running line and power map of the double-shaft engine were shown. The effects of the environmental changes on the engine performance evaluated. This engine will be used as a driver of a test rig facility of centrifugal compressors of micro gas turbines (MGTs).

Automated summary

This study presents a new method for analyzing the simulation and off-design performance of gas turbine engines, successfully applied to the performance testing of the Olympus-HP micro turbojet engine. The research also explores the off-design performance of a double-shaft gas turbine, providing important insights for evaluating the impact of environmental changes on engine performance.