混合长度理论应用于城市污水圆管湍流的研究

Study on pipe turbulent flow of urban sewage using mixed length theory

从圆管湍流切应力的变化规律,以及雷诺应力是质点掺混而导致的动量输运率实质出发,应用普朗特混合长度理论,提出一种分析城市原生污水中固体微粒对流动特性影响的有效方法,导出了原生污水综合密度和卡门常数的计算公式,得到原生污水圆管流的半经验速度场以及阻力特性,指出了污水圆管流的特殊之处.

From the variability of pipe turbulent flow stress and the essential of Reynolds stress, this paper uses Prandtl mixed length theory, gives out an effective method to analyze the influence to the flow characteristic by the solid particulates in the sewage, deduces the formulae of compositive density and Kármán constant, gains the field of velocity and resistance characteristic about pipe turbulent flow of virgin sewage, emphasizes the particularities of pipe flow of sewage.