亚声速旋拧射流噪声中的温度效应

doi:10.7527/S1000-6893.2016.0100

非定常流动数值模拟研究

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亚声速旋拧射流噪声中的温度效应

杨海华¹, 周林², 万振华¹, 孙德军¹

1. 中国科学技术大学近代力学系, 合肥 230027;
2. 中国工程物理研究院总体工程研究所, 绵阳 623100

收稿日期:2016-03-03 修回日期:2016-03-24 出版日期:2016-08-15 发布日期:2016-04-05
通讯作者: 万振华,Tel.:0551-63606954。E-mail:wanzh@ustc.edu.cn E-mail:wanzh@ustc.edu.cn
作者简介:杨海华,男,博士研究生。主要研究方向:气动噪声。E-mail:dream@mail.ustc.edu.cn;周林,男,博士,副研究员。主要研究方向:气动噪声、高超声速流动。E-mail:411zhoul@caep.ac.cn;万振华,男,博士,副教授。主要研究方向:流动稳定性、气动噪声和热对流。Tel:0551-63606954。E-mail:wanzh@ustc.edu.cn;孙德军,男,博士,教授,博士生导师。主要研究方向:流动稳定性、气动噪声和热对流。E-mail:dsun@ustc.edu.cn
基金资助:
国家自然科学基金（11232011，11402262，11572314）；中国博士后科学基金（2014M561833）；中央高校基本科研业务费专项资金

Temperature effects on noise in subsonic swirling jets

YANG Haihua¹, ZHOU Lin², WAN Zhenhua¹, SUN Dejun¹

1. Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China;
2. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 623100, China

Received:2016-03-03 Revised:2016-03-24 Online:2016-08-15 Published:2016-04-05
Supported by:
National Natural Science Foundation of China (11232011, 11402262, 11572314);China Postdoctoral Science Foundation (2014M561833);the Fundamental Research Funds for Central Universities of China

摘要/Abstract

摘要：

采用大涡模拟（LES）方法模拟亚声速旋拧射流，着重考察温度效应对旋拧射流近场流动演化过程、湍流脉动空间发展和远场噪声的影响。线性稳定性分析表明，旋拧射流中提高射流中心温度会增加剪切层的扰动增长率；数值结果显示，加热会促进剪切层中大尺度结构的产生及相互作用，促使流动更快进入湍流状态，并缩短射流势核区的长度。在初始层流发展阶段，加热会提高中心线上的流向速度脉动峰值，但是对剪切层中的流向速度脉动峰值几乎没有影响；在湍流发展阶段，提高射流中心温度会提高流向速度脉动衰减率，并降低脉动幅值。此外，在非等温射流中，密度脉动幅值要远高于等温射流。在30°方位角附近，等温射流的总声压级幅值最高，冷射流的噪声幅值最低。方位角大于50°时，加热使总声压级降低，且随着方位角幅值的增大，降低越明显；而冷却则会提高总的声压级幅值。

关键词: 旋拧射流, 大涡模拟, 温度效应, 噪声, 相干结构

Abstract:

Large eddy simulation (LES) is performed for investigating temperature effects in subsonic swirling jets. The effects on the flow development and far-field noise are discussed in detail. The results of linear stability theory show that the growth rates of the shear layers are raised as the core temperature increases; the LES results show that heating promotes the interactions of large-scale structures, makes the flows develop into turbulence more quickly and shortens jet potential cores. At the laminar stage, heating raises the peak of axial velocities fluctuations in center lines; however, it has negligible influence on the peak values in shear layers. At the turbulent stage, as the core temperature increases, the levels of velocity fluctuations become lower and the decay rates become higher. Additionally, it is found that the density fluctuations in non-isothermal jets are much higher than those in isothermal jets. At polar angles near 30°, the overall sound pressure level of the hot jet is lower than that in the isothermal jet and higher than that in the cold jet. However, when polar angle is larger than 50°, heating reduces the sound pressure level and the reduction becomes much larger as polar angle increases. While, the sound pressure level increases slightly in the cold jet.

Key words: swirling jet, large eddy simulation, temperature effect, noise, coherent structure

中图分类号:

V211.3

杨海华, 周林, 万振华, 孙德军. 亚声速旋拧射流噪声中的温度效应[J]. 航空学报, 2016, 37(8): 2436-2444.

YANG Haihua, ZHOU Lin, WAN Zhenhua, SUN Dejun. Temperature effects on noise in subsonic swirling jets[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(8): 2436-2444.

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亚声速旋拧射流噪声中的温度效应

Temperature effects on noise in subsonic swirling jets

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