非定常环境中叶栅总压恢复系数的数值研究
Numerical Investigation of Total-Pressure Recovery Coefficient of Cascade in Unsteady Environment
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摘要: 利用以Ni格式和隐式双时间步法求解二维非定常N-S方程为基础的数值模拟方法研究了流动的非定常性对涡轮叶栅总压恢复系数的影响,并与文中提出的定常模型和准定常模型进行了对比。结果发现,非定常流动能够提高叶栅的总压恢复系数,但这是建立在与准定常流相比较的层面上,而和定常流比较时,非定常流只会使总压恢复系数下降。Abstract: A numerical method based on Ni and implicit dual-time steps scheme for solving the 2-D unsteady N-S equations is applied to investigating the influence of unsteadiness on the total-pressure recovery coefficient of turbine cascade,results of which are compared with that of the steady model and quasi-steady model introduced in this paper.Calculated results show that the unsteadiness of flow can increase the total-pressure recovery coefficient of cascade,when compared with quasi-steady flow.The unsteady flow tends to decrease the total-pressure recovery coefficient when compared with steady flow.
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