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利用Fluent软件,通过脊状平板表面数值模拟,分析黏性阻力、压差阻力、壁面切应力、湍流特性等在脊状平板表面中分布规律,基于能量耗散分析,为脊状结构尺寸选取和局部区域改造提供参考依据。结果表明:脊状尺寸越大越有利于黏性阻力减小,但会导致压差阻力增加,而脊状结构压差阻力主要由迎风面与间隔交接处附近高压区决定。高壁面剪切应力集中于相邻沟槽之间区域前段,且脊状结构越小,光滑表面大于脊状结构内壁面剪切应力的区域也相对越多。对脊状结构平板近壁区涡量与湍流特性分析发现,沟槽最底端部分流体是近乎静止的,脊状结构表面涡量与湍流强度均小于光滑表面,而在脊状结构沟槽内所形成的旋涡区域,能量耗散开始大于光滑表面。
Fluent software is used to analyze the distribution of viscous resistance, pressure resistance, wall shear stress and turbulent flow in the ridge plate surface through numerical simulation of ridge plate surface. Based on energy dissipation analysis, Local area to provide a reference for the transformation. The results show that the larger the ridge size is, the better the viscosity resistance decreases, but the pressure drop resistance increases. The pressure drop resistance of the ridge structure is mainly determined by the high pressure zone near the junction of the windward surface and the space. The high wall shear stress is concentrated in the anterior section of the area between adjacent grooves, and the smaller the ridge structure is, the more the smooth surface is larger than the shear stress of the inner wall surface of the ridge structure. The analysis of the vorticity and turbulence in the near wall of ridge structure shows that the fluid in the bottommost part of the groove is almost stationary and the vorticity and turbulence intensity on the surface of the ridge are less than those on the smooth surface. The resulting swirl region begins to dissipate more energy than the smooth surface.