本文選題：大渦模擬　切入點：FW-H方程　出處：《航空動力學(xué)報》2016年09期 　論文類型：期刊論文

【摘要】：采用大渦模擬(LES)結(jié)合Ffowcs Williams-Hawkings(FW-H)方程研究了圓柱-翼型干涉噪聲的頻譜特征和四極子噪聲的影響.流場結(jié)果與實驗吻合較好,聲場獲得了與實驗相一致的頻譜形狀,翼型前緣30%弦長為主要干涉噪聲源.針對計算與實驗展向高度不同的問題,首先基于相關(guān)函數(shù)為三角函數(shù)的假定推導(dǎo)了展向修正公式,并與相關(guān)文獻(xiàn)采用矩形函數(shù)、指數(shù)函數(shù)及高斯函數(shù)所得結(jié)果進(jìn)行了對比.結(jié)果表明:不同的修正方法修正量差別高達(dá)7.6dB,三角函數(shù)與矩形函數(shù)修正效果類似,優(yōu)于高斯函數(shù),指數(shù)函數(shù)修正效果最差.分別采用固體壁面和可穿透數(shù)據(jù)面作為積分面,研究了體聲源的影響,結(jié)果表明低馬赫數(shù)下四極子噪聲的影響可以忽略不計.
[Abstract]:The spectral characteristics of cylindrical airfoil interference noise and the influence of quadrupole noise are studied by means of large eddy simulation (les) and Ffowcs Williams-Hawkingsn FW-HH equation. The results of the flow field are in good agreement with the experimental results. The 30% chord length of the leading edge of the airfoil is the main interference noise source. Aiming at the problem of the difference between the calculated and experimental spanned height, based on the assumption that the correlation function is a trigonometric function, the spanned correction formula is derived, and the rectangular function is used with the related literature. The results obtained from exponential function and Gao Si function are compared. The results show that the correction quantity of different correction methods is as high as 7.6 dB, and the effect of trigonometric function is similar to that of rectangle function, which is better than that of Gao Si function. The effect of volume sound source is studied by using solid wall surface and penetrating data surface as integral surface respectively. The results show that the influence of quadrupole noise at low Mach number can be neglected.
【作者單位】： 西北工業(yè)大學(xué)動力與能源學(xué)院;
【基金】：國家自然科學(xué)基金(51276149;51476134) 空氣動力學(xué)國家重點實驗室研究基金(SKLA20140201)
【分類號】：V211

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本文編號：1607799