【摘要】 应用自行开发的管网算法,数值模拟了某型重燃第一级动叶内部冷却结构在静止和旋转状态下的流动和换热特性,结果表明:在相同的边界条件下,与静止状态比较,动叶旋转产生的离心力和科氏力改善了冷气在冷却流道内的流动,提高了冷气的流量以及被冷却壁面对冷气的扰动,增大了冷却流道內壁面的换热系数,从而提高了冷气的冷却效率。如果在静止状态动叶冷却结构满足设计要求,那么在旋转状态动叶的冷却结构也必定满足设计要求。更多还原

【Abstract】 The independently designed fluid network algorithm is used to simulate the original cascade of Mark Ⅱ. The calculated results are compared with the experimental data to verify the reliability of the algorithm. Meanwhile, the improved cascade of Mark Ⅱ is numerically simulated to verify the engineering practicability of the algorithm. The heat transfer between the cooling gas and the blade wall is enhanced and then the temperature of the blade wall is reduced attributing to the increased turbulence of the coolant, which is caused by the sudden expansion and contraction of the cooling passage. The numerical results of the original and improved cascade show that the fluid network algorithm can quickly and qualitatively determine the feasibility of the design with the characteristics of clear physical meaning, simple and reliable.更多还原