摘要
针对大宽高比弯曲混合喷管排气红外和射流噪声抑制的需求,在狭长矩形喷口的基础上对混合喷管喷口结构进行重新设计,包括不同尺寸参数的波瓣喷口和不同侵入程度的冠状锯齿喷口。针对上述喷管,采用数值模拟的方法,获得大宽高比弯曲混合喷管的射流流场,并通过正反射线追踪法和Fluent软件FW-H声学模块分别计算了混合喷管的排气红外辐射强度和射流噪声总声压级。对研究结果进行分析,揭示了狭长矩形喷口、波瓣喷口和冠状锯齿喷口对混合喷管的引射性能、压力损失以及排气红外和噪声特性的影响机制,阐释了喷口激励的流向涡在射流与环境气流掺混过程中的强化主导作用及其抑制排气红外辐射和噪声的兼容性。
To suppress exhaust plume infrared and jet noise of the curved mixing duct with a large aspect ratio,the structure of the mixing duct nozzle is redesigned on the basis of the narrow rectangular nozzle,including lobed nozzles with different structural parameters and coronal sawtooth nozzles with different intrusion degrees.The numerical simulation method is used to obtain the jet flow field of the above nozzles.The forward-reverse ray-tracing method and FW-H acoustic module of Fluent software are used to calculate the infrared radiation intensity of the exhaust plume and the overall sound pressure level of the jet,respectively.Analysis of the results reveals the mechanism of influence of the narrow rectangular nozzle,lobe nozzle and coronal sawtooth nozzle on the pumping performance,pressure loss and exhaust plume infrared and jet noise characteristics of the mixing duct.The strengthening leading role of the flow vortex excited by the lobe nozzle and sawtooth nozzle in the mixing process of jet and ambient air flow and the abilities of the flow vortex to suppress both exhaust plume infrared radiation and jet noise are also explained.
作者
杨宗耀
张靖周
单勇
Zongyao YANG;Jingzhou ZHANG;Yong SHAN(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2023年第5期106-120,共15页
Acta Aeronautica et Astronautica Sinica
基金
国家科技重大专项(J2019-Ⅲ-0009-0053)。
