中文摘要：

为获得风扇孤立转子噪声信息及评估降噪设计的效果,采用了一种混合数值方法来模拟航空发动机的风扇噪声。运用非定常雷诺应力平均方法构造出了风扇声源,应用边界元方法对一种低噪声设计的弯掠风扇叶片以及进气道声衬效果进行了分析。结果表明,两类降噪措施可以改善叶片的噪声源特性和机身表面的风扇纯音噪声量级。

英文摘要：

A hybrid numerical method is used to simulate the fan noise from aeroengine. Such work is aimed to acquire source strength of the rotor blade and to obtain the acoustic load on fuselage. The fan noise source is calculated using periodic URANS code. A sweep rotor blade design and inlet duct liner are modelled to assess their potential in decreasing fan noise with BEM,and results indicated promising tonal noise reduction and significant broadband noise reduction.