摘要
采用雷诺平均纳维—斯托克斯方程(RANS)和基于壁面律的RNGk-ε湍流模型,运用SIM-PLEC算法,模拟了导叶后扩散段喇叭口至流道顶板7种不同高度hp时箱涵式出水流道的三维流场,预测了旋涡的发生位置和形态,分析各方案的流道水力损失规律.结果表明:当hp/D1<0·2时(D1为喇叭口直径),喇叭口为环向出水,再增大则渐变为单向;环向出水时,后壁区居中处,有一旋涡存在而单向出水,则为对称旋涡.相同流量下,扩散段喇叭口至顶板距离越小,则水力损失越大,当hp/D1<0·20时,水力损失随hp/D1减小而急剧增加.
Reynolds-Averaged Navier-Stokes （RANS） equation is applied for the simulation of 3D flow field in the tank-style outlet passage of large pumping stations. The RNG k - ε model with wall function law and SIMPLEC algorithm is adopted in the calculation. The inner flow status and various types of vortices in the tank-style outlet passage for different height from the outlet of distribution part to the top of passage are predicted. A general conclusion is that with the height becomes smaller, the hydraulic loss becomes larger. When hp/D1〈0. 20, the hydraulic loss increases rapidly.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2005年第6期468-471,共4页
Journal of Jiangsu University：Natural Science Edition
基金
江苏省重点实验室开放基金资助项目(KJS02035)
扬州大学自然科学基金资助项目(G0211086)
