【摘要】：展向旋轉(zhuǎn)平面庫埃特湍流是旋轉(zhuǎn)系統(tǒng)下壁湍流研究的經(jīng)典問題,并且此湍流問題中的大尺度渦卷(roll cells)結(jié)構(gòu)也受到廣泛關(guān)注.本文采用五分解方法將存在二次流的瞬時場分解為五部分,包括平均流場、二次流場的流向和橫向部分以及剩余場的流向和橫向部分.通過五分解法,可以掌握湍動能各分量在能量平衡和能量傳遞方面的重要機(jī)制.研究結(jié)果表明:二次流和剩余場的流向運(yùn)動(橫向運(yùn)動)是通過二次流渦量與剩余場剪應(yīng)力相關(guān)項(xiàng)進(jìn)行能量傳遞,二次流(剩余場)的流向運(yùn)動和橫向運(yùn)動之間是通過旋轉(zhuǎn)項(xiàng)進(jìn)行能量傳遞;此外,剩余場的流向和橫向運(yùn)動之間還通過壓力與應(yīng)變率相關(guān)的再分配項(xiàng)進(jìn)行能量傳遞;對于剩余場流向部分,在一定的旋轉(zhuǎn)強(qiáng)度范圍內(nèi),通過二次流渦量與剩余場剪應(yīng)力相關(guān)項(xiàng)從二次流流向部分獲取的能量大于從平均流獲取的能量,說明二次流流向運(yùn)動對剩余場流向運(yùn)動有很大影響.
[Abstract]:The spanned plane Kuett turbulence is a classical problem in the study of the wall turbulence in a rotating system, and the large scale vortex (roll cells) structure in this turbulence problem has been paid more and more attention. In this paper, the instantaneous field with secondary flow is decomposed into five parts, including the average flow field, the flow direction and transverse part of the secondary flow field, and the flow direction and transverse part of the residual field. By means of the five-decomposition method, the important mechanism of energy balance and energy transfer of the components of turbulent kinetic energy can be grasped. The results show that the flow direction motion (transverse motion) of the secondary flow and the residual field is transmitted through the terms of the vorticity of the secondary flow and the shear stress of the residual field. The energy transfer between the flow direction and the transverse motion of the secondary flow (residual field) is carried out by the rotation term. In addition, the energy transfer between the flow direction and the transverse motion of the residual field is carried out by the redistribution term which is related to the strain rate. For the flow direction part of the residual field, the energy obtained from the secondary flow direction is larger than the energy obtained from the average flow through the second flow vorticity and the shear stress of the residual field in a certain range of rotation intensity. It shows that the secondary flow direction motion has a great influence on the residual flow direction motion.
【作者單位】： 北京大學(xué)工學(xué)院湍流與復(fù)雜系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室;北京大學(xué)工學(xué)院航空航天工程系;北京大學(xué)工學(xué)院應(yīng)用物理與技術(shù)研究中心;浙江大學(xué)航空航天學(xué)院工程力學(xué)系;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:11521091,11272013,11302006)資助的課題~~
【分類號】：O357.5

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