Abstract:
From the perspective of performance and reliability testing, this paper analyzes the testing requirements for the engine-level test of gas turbine engine, and identifies the key parameters, including thrust, power, speed, flow rate, temperature, pressure, and vibration. The principles, applications, and development trends of the relevant testing techniques for each parameter are introduced. For thrust and power measurement, the structure of thrust measurement bench and power measurement system, along with their calibration methods, are described. In terms of rotational speed measurement, typical speed measurement systems and strategies for dealing with signal distortion are presented. Regarding flow rate measurement, velocity, differential pressure, and mass flow meters used for fuel flow measurement, as well as the structure and measurement point arrangement of the intake air flow measurement section are discussed. For temperature measurement, gas temperature measurement and wall temperature testing methods encompassing resistance temperature detectors, thermocouples, temperature-indicating paint, fluorescent temperature measurement, and radiation temperature measurement techniques are introduced. In pressure measurement, the pressure testing system is described, and the challenges and solutions for dynamic pressure testing in high-temperature environments are analyzed. In vibration measurement, the engine-level vibration testing system and the issues related to vibration measurement point arrangement are discussed. The testing techniques for the key parameters of gas turbine engine are expected to evolve towards higher accuracy, higher frequency response, and higher temperature tolerance. Meanwhile, the engine-level testing systems will tend towards intelligence and integration.