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本文根据二维不可压紊流附面层理论推导得到平面叶栅叶背优化速度分布的一般表达式,提出按给定的进出口气流条件估算叶背环量的方法,从而具体地确定了叶背的优化速度分布。最后作了一个具体算例,即根据叶背优化速度分布,用中心流线法求解无粘流反问题,得出大致满足各方面要求的压气机叶型,并用S_1流面正问题计算机程序对叶片表面速度分布进行了校验。计算表明:这种叶型的总压损失系数比之于为满足同样进出口气流条件而按常规方法选配的NACA-65系列叶型来说要小。
Based on the theory of two-dimensional incompressible turbulent boundary layer, the general expression of the optimal velocity distribution of flat blade cascades is deduced, and the method of estimating the amount of leaf dorsal rings according to the given inlet and outlet airflow conditions is proposed. Back speed of optimization distribution. Finally, a concrete example is given. According to the optimal speed distribution of the blade back, a central streamline method is used to solve the non-viscous flow inverse problem, and the compressor blade type that meets the requirements of all aspects is obtained. The computer program of S_1 flow surface positive problem Leaf surface velocity distribution was checked. Calculations show that the total pressure loss coefficient for this type of vane is smaller than that of the NACA-65 series of vanes that are conventionally chosen to meet the same inlet and outlet airflow conditions.