摘要
民机在降雨环境下的起飞和爬升过程中,雨水和飞行迎角耦合形成的复杂进气畸变对发动机性能有着不可忽视的影响,探究降雨浓度和飞行迎角对发动机风扇性能的影响具有积极意义。以某小型高涵道比涡扇发动机为研究对象,基于两相流原理,利用数值模拟方法研究了不同飞行迎角和大气雨浓度对进气道、风扇级的影响。结果表明,在适航规定要求的大气雨浓度和飞行迎角的共同影响下,飞行迎角增大使得雨滴在风扇各通道内周向分布不均匀,受进气总压畸变影响的通道内雨滴数目减少,非畸变区通道内雨滴数目增加,且迎角越大,雨滴分布越不均匀。雨水没有明显增强受总压畸变影响通道内的流场畸变程度,而是主要恶化总压畸变影响较弱区域的风扇和出口导叶的性能。
During the takeoff and climb processes of civil aircraft in rainy environments,the complex intake distortion formed by the coupling of rainwater and flight attack angle has a significant impact on engine performance.Investigating the influence of rainfall concentration and flight attack angle on the engine fan is of paramount importance.In this study,a small high bypass ratio turbofan engine is selected as the research object,and numerical simulation method based on the two-phase flow principle is employed to investigate the effects of different flight attack angles and atmospheric rain concentration on the intake duct and fan stages.The results indicate that,under the joint influence of atmospheric rain concentration and the required flight attack angle as per airworthiness regulations,increasing the flight attack angle leads to non-uniform distribution of raindrops in the fan ducts,reduces the number of raindrops in the ducts affected by total pressure distortion,increases the number of raindrops in the channels non-distortion area,and makes the distribution of raindrops more uneven with an increasing angle of attack.Rainwater does not significantly increase flow field distortion in the ducts affected by total pressure distortion,but primarily impairs the performance of the fan and outlet guide vanes in the areas of total pressure distortion affected weakly.
作者
傅文广
余军杨
郭重佳
孙鹏
Wen-guang Fu;Jun-yang Yu;Chong-jia Guo;Peng Sun(College of Safety Science and Engineering,Civil Aviation University of China;Marine Engineering College,Dalian Maritime University)
出处
《风机技术》
2023年第5期1-8,共8页
Chinese Journal of Turbomachinery
基金
天津市多元投入基金项目青年项目(21JCQNJC00930)。
关键词
涡扇发动机
飞行迎角
大气雨浓度
两相流
进气畸变
Turbofan Engine
Flight Attack Angle
Atmospheric Rain Concentration
Two Phase Flow
Inlet Distortion
