尺度适应模型用于模拟射流流量对空腔压力脉动的抑制  

Suppression effect of jet flow on pulsating pressure of cavity using scale-adaptive simulation model

作　　者：余培汛[1] 白俊强[1] 郭博智[1,2] 韩啸[1] 韩珊珊[1] 

机构地区：[1]西北工业大学航空学院,西安710072 [2]中国商用飞机公司上海设计研究所,上海200233

出　　处：《声学学报》2015年第1期71-81,共11页Acta Acustica

摘　　要：空腔气动噪声的抑制对武器舱声学相关难题的解决具有重要意义。采用两方程尺度适应模型的计算流体力学方法对空腔标模进行模拟,通过与国外学者及风洞试验数据的对比,验证了该计算方法的可靠性。基于此,对比分析了不同射流量的射流方式对空腔时均变量,湍动能、压力脉动均方根、声源分布及压力脉动的频域特性的影响,分析可得:射流方式通过改变剪切层的形态来达到影响空腔中的流场形态及压力脉动均方根分布,其中射流构型4(Spout4)能有效降低整个空腔的压力脉动均方根。结果表明:不同射流量对腔内压力脉动及远场噪声的抑制效果不同,且射流量的大小与其抑制效果并不成正比关系。The suppression of the aerodynamic noise in the cavity has a great significance to solve relevant puzzles of weapon bays. Acoustic field of the standard cavity model is simulated by using the computational fluid dynamics technology based on scale-adaptive simulation （SAS） model. The results obtained by the proposed method in this paper show reasonable agreement with experiments. In the basis of this, effect of different jet flow rates on the time-averaged variables, turbulent kinetic energy, root mean square （RMS） of sound pressure, sound sources distribution and the pulsating pressure distribution in the cavity is studied. The analysis shows that the jet flow has great influence on the cavity flow field morphology and the distribution of pulsating pressure RMS by changing the morphology of the shear layer. The most obvious of these measures is spout4 configuration, the influence mainly in the form of reducing the pulsating pressure of the whole cavity and changing the sound pressure level in the far field. The results show that different jet flow rates have different control effects on pulsating pressure in the cavity and sound pressure level in the far field. Furthermore, the jet flow rates and the suppression effect on the pulsating pressure have no linear relation.

关 键 词：射流流量 压力脉动 空腔 模拟 模型 计算流体力学方法 气动噪声 抑制效果 

分 类 号：O358[理学—流体力学]