掠叶片进口流动的流线曲率通流模型

掠叶片作为一项设计技术，在当前轴流风扇/压气机的设计中已被广泛采用，对掠叶片的流动机理研究也被广泛而深入地开展。近年来，多项研究表明掠能够改变叶片的攻角，这种攻角的改变是由掠造成叶片进口的径向平衡发生变化、轴向速度重新分布而产生的。提出了一种用于S2流线曲率法的掠叶片的进口流动模型，不再假设叶片进口周向流动均匀，因而能够计入由于叶片掠而产生的进口径向平衡的变化。将此模型应用到亚声掠转子叶片的设计中，结果表明该模型能够比原始方法更准确地计算轴向速度和攻角，从而提高了设计精度，并定量地分析了叶片掠对进口流动压力平衡的作用机理。

An inlet flow model of swept blades for streamline curvature through-flow methods

As a designing technique, blade sweep is currently widely utilized in the design of axial fans/compressors. The flow mechanisms of blade sweep has been extensively studied. In recent years, many studies have reported the incidence variation due to sweep, which can be attributed to the alteration of inlet radial equilibrium and axial velocity distributions induced by blade sweep. An inlet flow model of swept blades for streamline curvature through-flow methods is developed. The model takes into account the variation of inlet radial equilibrium due to blade sweep, without the hypothesis that the flow is uniform in the circumferential direction at the blade inlet. The model is applied for the design of a subsonic swept rotor blade, and the results show that in comparison with the original calculation, the model proposed can predict the distribution of axial velocity as well as the incidence angle more precisely. Therefore, the accuracy of design is improved with the model. Moreover, the effect of blade sweep on inlet radial pressure equilibrium is quantitatively analyzed.