湍流边界层流场与噪声实验研究  

An Experimental Study on the Turbulent Boundary Layer Flow Field and Its Noise

作　　者：罗柏华[1] 刘宇陆[1] 

机构地区：[1]上海大学应用数学和力学研究所,200072

出　　处：《实验力学》2001年第4期378-386,共9页Journal of Experimental Mechanics

摘　　要：在重力式水洞中进行了水翼及半翼湍流边界层流场与噪声的实验研究 .测量了水翼及半翼边界层附近的湍流脉动速度场 ;测量了半翼翼型表面三点处的压力脉动及其辐射噪声 ,测量了水翼内部测点的噪声及外部辐射噪声 ,在不同流速、不同攻角、光滑和粗糙翼面的情况下都进行了测量分析 .试验结果发现 ,上述因素对模型的边界层湍流速度场有显著影响 ,1 5度攻角时 ,翼面附近湍流强度要比 0度时大得多 ,粗糙翼面附近的湍流强度比光滑的大 ,而湍流强度随来流速度的变化不大 ,u(来流 )方向和v方向的湍流强度量级相当 ;一般地 ,翼面压力脉动、翼内部噪声及外部噪声都是随来流速度的增大而增大 ,随攻角的增大而增大 ,粗糙翼面时的结果要比光滑翼面的大 .从压力脉动与噪声测量结果与相应的流场测量结果比较可知 。Tests were conducted in water tunnel for the turbulent boundary flow and its noise of a hydrofoil and a half-hydrofoil. Measurements were made for the fluctuating velocities of the hydrofoils and its noise relating to various free flows, attack angles and different roughness of the foil-surfaces. It was found that flow velocity, attack angle and roughness of the surface all have obvious effects on the turbulent flow and its noise. The turbulent intensity of 15° attack angle was much larger than that of 0° attack angle, and the turbulent intensity of rough surface was larger than that of smooth surface. The turbulent intensity was nearly independent of the free flow velocity,and the magnitude of the u-wise and v-wise turbulent intensity were of the same order. Generally, the noise of the turbulent boundary layer of the hydrofoil was more intensive for the cases with higher velocity, larger attack angle and rougher surface. From the measuring results of both fluctuating velocity and its noise, we can deduced that the noise source intensity could be qualitatively observed by the turbulent intensity though it is known theoretically that the noise source intensity is determined by the second time derivative of the fluctuating velocity.

关 键 词：湍流噪声 湍流边界层 流动噪声 流场 重力式水洞 水翼 

分 类 号：O357.52[理学—流体力学] U661.71[理学—力学]