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前言斜板斜管特性参数式由 K.M.姚氏推导出后于1970年发表。此式已在给水排水的技术文献中广泛应用,且已引用在我国高等学校的教材中,比起田中和美的分离粒径式的推导,姚氏考虑了斜板斜管内流速不均匀分布的影响,其推导在理论上较为完善,但没有从此给出具体的颗粒在斜板斜管内的运动轨迹方程。国内已有文章对姚氏在推导斜板斜管特性参数式时采用的计算长度提出了看法,并指出了姚氏公式与田中公式之间的差别,遗憾的是没有明确指出采用修正后的计算长度而获得的特性参数式的几何意
Foreword The sloping plate inclined tube characteristic parameter formula was deduced by K.M. Yao and published in 1970. This formula has been widely used in the technical literature of water supply and drainage, and has been quoted in the teaching materials of higher education institutions in China. Compared with the derivation of Tanaka and Midea’s separation particle size formula, Yao considered the influence of uneven distribution of velocity in oblique pipe The derivation is theoretically more complete, but no specific trajectory equations for the particles in the inclined plate of the inclined plate are given. Domestic articles have provided opinions on the calculation length used by Yao during the derivation of the swash plate inclined pipe characteristic parameter formula, and pointed out the difference between Yao’s formula and Tanaka formula. Unfortunately, it is not clear that the revised calculation is used. The characteristic parametric geometrical meaning obtained by the length