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在气动噪声的数值计算过程中,非定常流动的求解精度对声学计算结果有着重要的影响。以机体噪声计算的标准算例双圆柱绕流气动噪声问题为研究对象,采用基于非线性k-ε湍流模型的限制数值尺度(LNS)方法对双圆柱绕流进行了数值模拟,将计算得到的气动特性和流动特征与相应的试验结果进行了对比分析。为了求解远场观测点处的气动噪声,在精确求解双圆柱绕流流动的基础上结合基于FW-H(Ffowcs Williams-Hawkings)方程的声类比方法进行数值计算,并通过圆柱体的展向相关性对计算结果进行了修正,将得到的最终结果与相应的声学试验结果进行了对比,两者吻合良好,表明该数值方法是准确、可靠的。
In the numerical calculation of aerodynamic noise, the accuracy of unsteady flow solver has an important influence on the acoustic calculation results. Based on the standard example of body noise calculation, the problem of aerodynamic noise of double-cylinder around-flow was studied. The flow around a double-cylinder was numerically simulated by limiting numerical scale (LNS) based on the nonlinear k-ε turbulence model. The calculated The aerodynamic characteristics and flow characteristics were compared with the corresponding test results. In order to solve the aerodynamic noise at far-field observation points, the acoustic analogy method based on the FW-H (Ffowcs Williams-Hawkings) equation is used to solve the flow of double-cylinder flow accurately. The result of calculation is modified, and the final result is compared with that of the corresponding acoustic test. The results agree well with each other, which shows that the numerical method is accurate and reliable.