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采用商用计算流体力学软件CFX,湍流模型采用标准k-w两方程湍流模型,叶型为单涡轮动叶叶片,应用数值模拟方法研究了弧形端壁造型对动叶泄漏流动及涡轮气动性能的影响。数值研究结果表明:适当优化的弧形端壁造型可以改善泄漏涡和通道涡作用状况、提高出口总压和改善气流角分布、降低叶顶间隙泄漏和提高效率。最优端壁造型可以减少间隙泄漏0.27%,提高效率0.77%。在变攻角下,最优端壁造型效率最高点出现在设计攻角下,但攻角变化越大,间隙泄漏流动越少。
The commercial computational fluid dynamics software CFX is used. The standard k-w turbulence model is used for the turbulence model and the single-turbine rotor blade is used for the turbulence model. The numerical simulation is used to study the influence of curved end wall on the leakage flow and the aerodynamic performance of the turbine. The numerical results show that the proper arc shape of the end wall can improve the effect of leakage vortex and channel vortex, increase the total outlet pressure and improve the air flow angle distribution, reduce the tip clearance leakage and improve the efficiency. Optimal end wall shape can reduce the gap leakage 0.27%, improve the efficiency of 0.77%. Under variable angle of attack, the highest point of the best efficiency of the end wall design appears at the design attack angle, but the larger the angle of attack changes, the less the gap leakage flow.