涡扇发动机整机试验高压压气机流量计算方法研究

Approachfor Computing Mass Flow Rate of High Pressure Compressor in Turbofan Engine Test

关键词:  涡扇发动机  整机试验  高压压气机  进口流量  计算

Key words:  Turbofan engine  Whole engine test  High pressure compressor  Inlet mass flow  Computation

摘要:

发展了一种涡扇发动机整机状态下高压压气机进口流量的计算方法。通过部件试验获得转速、压比、可调静叶（VSV）角度和级间引气对高压压气机进口换算流量的影响规律，基于此规律将核心机试验结果修正到设计要求状态，获得对应于设计要求工况的压气机“转速-流量基准数据”。基于该“转速-流量基准数据”和整机试验工况相对于设计要求状态的偏差，根据部件试验获得的各因素影响规律，修正得到整机试验实际工况下的高压压气机的进口流量。本方法经某大涵道比涡扇发动机部件试验和多台份核心机试验验证，方法可靠，流量计算偏差小于0.5%，应用于整机试验能够有效支撑试验的开展和整机性能的评估。

Abstract:

Proposed an approach for obtaining high pressure compressor （HPC） inlet mass flow rate in a turbofan engine test. Firstly， data of HPC rig tests is accumulated to illustrate which pattern the HPC mass flow rate is influenced by rotational speed， pressure ratio， variable stator vanes （VSV） angle， and inter-stage bleeding. Secondly， based on the pattern acquired above， the HPC mass flow rate in core engine tests is modified to get the “rotational speed-mass flow rate baseline data”， which is accord with the design objective. Lastly， the HPC massflow rate under actual working condition of a whole engine test is calculated by modifying the “rotational speed-mass flow rate baseline data”， based on the deviation from design objective of the influence factors. This approach has been verified by HPC rig tests and core engine tests of a certain high bypass ratio turbofan engine. The deviation of calculated mass flow rate is less than 0.5%.It can effectively support whole engine tests and the evaluation of engine performance.