【摘要】 为了改善矩形截面直角弯管内流场均匀性,利用FLUENT软件对弯管内流体流动情况进行数值模拟计算,分析了不同数量和不同结构导流板的布置对弯管内流场均匀性、局部阻力和能量损失的影响。结果表明:弯管内未加装导流板时,流速分布不均匀、出现涡流和二次流,而布置导流板后可以有效提高流场均匀性;布置合理数量的导流板不仅能有效改善流场均匀性、完全消除因直角弯头引起的涡流和二次流,而且能大幅度减小流动阻力和能量损失。通过对3种不同设计方案的导流板进行数值模拟分析,获得最优的导流板数量和结构。更多还原

【Abstract】 In order to improve the flow field uniformity in a right-angle bent tube with rectangular section,the fluid flow in the elbow was numerically simulated by FLUENT software. The effects of the uniformity of flow field and local resistance and energy loss in the elbow were analyzed by using different quantities and structures of flow deflectors. The results show that the velocity distribution is not uniform,vortex and secondary flow occurs when the flow deflectors are not installed in the elbow,while the uniformity of flow field can be effectively improved after arranging the deflector plates; using a reasonable number of baffles can not only effectively improve the flow field uniformity and completely eliminate the vortex and secondary flow caused by the right-angle elbow,but also greatly reduce the flow resistance and energy loss. Through the numerical simulation analysis of the deflectors of three different design schemes,the optimal number and structure of the deflectors are obtained.更多还原