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本文在原曲面原理基础上提出了一种适于工程技术的设计方法,将设计叶型的三维空间座标(r、ψ,z)降维成二维平面座标(z,s)。这样,即可按初始条件先给定轮盖叶型轮廓线座标参数,并由前倾角约束方程算出轮毂叶型轮廓线座标参数,然后由子午面的子午流线与三个曲面元素线所组成的准正交线组算出叶型型面上坐标参数,使叶型设计简单方便,而仍具有三维空间特性,同时可以修正叶型的几何形状来给出叶片气动负载最佳值。通过轮径75mm的后掠式压气机的计算示例,证实了该法是正确可行的。
Based on the principle of the original surface, this paper presents a design method suitable for engineering, which reduces the three-dimensional space coordinates (r, ψ, z) of the designed leaf shape into two-dimensional plane coordinates (z, s). In this way, according to the initial conditions, firstly, the coordinate parameters of the outline of the wheel cover leaf profile can be given, and the coordinate parameters of the hub outline profile can be calculated according to the constraint equation of forward inclination, and then the meridional line of the meridian plane and the three surface element lines The composition of the quasi-orthogonal line group to calculate the coordinate parameters of the leaf surface, the leaf design is simple and convenient, but still has three-dimensional space characteristics, and can correct the leaf shape to give the best aerodynamic blade values. The calculation example of a swept-back compressor with a wheel diameter of 75mm confirms that this method is correct and feasible.