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本文讨论了用模化法设计压气机时,当展弦比1/b发生变化、静叶加减内围带、延长叶片及加厚叶片这四方面破坏几何相似条件时对压气机性能的影响。 文章指出,用模化法设计压气机时,在严格的几何相似不能保证的情况下,某些几何参数和结构可以作一些变化而不会对特性带来很大的影响。 目前,在设计压气机时,除采用平面叶栅资料来设计以外,还广泛地采用整机模化法。这种设计方法的先决条件是,必须有现成的母型和详细的试验资料。根据己经发表的资料来看,这种设计方法能够得出较理想的结果。 用整机模化法设计压气机时,需要满足三个相似条件:(1)动力相似、(2)运动相似、(3)几何相似。一般说来,这三个条件在大多数情况下是可以保证的。但是,在有些条件下,几何相似不能严格得以保证。例如,径向间隙数值就是如此。这就提出一个问题:在什么条件下允许稍微偏离一下严格的几何相似条件,而不致引起压气机性能的显著变化。根据采用模化法设计出的压气机的试验资料和近年来我们工作中得到的结果可以清楚地看出,在一定范围内某些几何参数是允许变化的。现分别叙述如下:
In this paper, we discuss the influence on the performance of the compressor when the compressor is modeled, and when the ratio of aspect ratio 1 / b changes, the inner and outer bands of stator blades are added or subtracted, the extended blades and padded blades are destroyed . The article points out that when the compressor is modeled, some geometrical parameters and structures can be changed without any significant impact on the characteristics under strict geometrical similarity guarantee. At present, in the design of the compressor, in addition to the use of plane cascade data to design, but also widely used machine molding method. A prerequisite for this design approach is that there must be ready-made parent and detailed test data. According to the published data, this design method can achieve better results. Compressor design with machine molding method, you need to meet three similar conditions: (1) similar power, (2) similar to the movement, (3) geometric similarities. In general, these three conditions are guaranteed in most cases. However, under some conditions, the geometric similarity can not be strictly guaranteed. For example, the value of radial clearance is the case. This raises the question of under what conditions allows a slight departure from the strict geometrical similarity conditions without causing significant changes in compressor performance. According to the test data of the compressor designed by the modeling method and the results obtained in our work in recent years, it is clear that some geometric parameters are allowed to vary within a certain range. Now are described as follows: