高速飞行器空腔脉动压力主动控制与非线性数值模拟
收稿日期: 2014-07-02
修回日期: 2014-10-08
网络出版日期: 2014-10-23
基金资助
航空科学基金(2012ZC52035)
Active control and nonlinear numerical simulation for oscillating pressure of high-speed aircraft cavity
Received date: 2014-07-02
Revised date: 2014-10-08
Online published: 2014-10-23
Supported by
Aeronautical Science Foundation of China (2012ZC52035)
空腔脉动压力(空腔噪声)预测是高速飞行器内埋弹舱的关键技术之一。非线性噪声求解方法是近年来新提出的一种噪声求解方法,为研究该方法对空腔噪声的预测性能,将雷诺平均Navier-Stokes(RANS)方程与之相结合。首先,通过RANS求解空腔周围流场,得到初始湍流统计平均解,其中包含平均流场基本特征及强制设定的湍流脉动的统计描述。然后,采用非线性噪声求解方法重构噪声源并高精度模拟压力脉动的传播,计算了马赫数Ma=1.5和Ma=5条件下的空腔噪声。结果表明,噪声特性计算值与试验结果基本吻合,说明非线性噪声求解方法对于高速空腔流动噪声具有较好的预测能力。在此基础上,研究了马赫数Ma=1.5和Ma=5条件下在空腔前缘加入气帘喷流主动控制措施对噪声的抑制作用,并得出在超声速和高超声速条件下,气帘喷流对于空腔脉动压力都有较好的抑制作用。
王一丁 , 郭亮 , 童明波 , 张杰 . 高速飞行器空腔脉动压力主动控制与非线性数值模拟[J]. 航空学报, 2015 , 36(1) : 213 -222 . DOI: 10.7527/S1000-6893.2014.0277
Prediction of oscillating pressure is a key technology for the weapon bay of high-speed aircraft cavity. Nonlinear numerical simulation is proposed as a new method to analyze noise recently. In order to evaluate the prediction performance of cavity noise, nonlinear numerical simulation solver is combined with Reynolds-averaged Navier-Stokes(RANS) equation. Firstly, the flow field around cavity is solved by RANS, and the average solution of initial turbulent statistics is obtained which contains the basic characteristics of average flow field and statistics description of turbulence fluctuation. After that, noise source is refactored and the spreading of pressure fluctuation is simulated precisely by the nonlinear acoustics solution. According to the comparison of the cavity noise calculation and experimental results under Ma = 1.5 and Ma = 5, it indicates that nonlinear numerical solution is able to well predict cavity flow noise at high speed. Based on that, the contribution to noise suppression made by active control such as adding jet screen at the leading edge of cavity under Ma = 1.5 and Ma = 5 is investigated. It is found that jet screen is suitable for suppression of oscillating pressure under supersonic condition as well as in hypersonic state.
Key words： oscillating; nonlinear; cavity; turbulence; active control
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