Abstract：
The conventional building drainage system was constructed based on the theory of two-phase flow involving water and air. However, the drainage system contained a more intricate three-phase flow, encompassing water, air, and solids, which was relatively overlooked in research. This study addressed the impact of solids on pressure fluctuations, air flow rates, and hydraulic jump fullness within the drainage system, considering three factors: the mass factor, cross-section factor, and viscosity. The investigation was conducted within a single-stack system using both experimental methods and CFD simulations. The findings revealed a positive correlation between both positive and negative pressures and above three factors. The mass factor and the cross-section factor had a more significant impact on the negative pressure of the system. The maximum growth rates of negative pressure extremes under different mass and cross-section factors reached 7.72 and 16.52%, respectively. In contrast, the viscosity of fecal sludge had a slightly higher effect on the positive pressure fluctuation of the drainage system, with the maximum growth rate of positive pressure extremes at 3.41%.
摘要：
传统的建筑排水系统是基于涉及水和空气的两相流理论构建的。然而,排水系统包含更复杂的三相流，包括水，空气,和固体，这在研究中相对被忽视了。这项研究解决了固体对压力波动的影响，空气流量,和排水系统内的水力跳跃充满度，考虑三个因素：质量因素，横截面系数，和粘度。研究是在单堆系统中使用实验方法和CFD模拟进行的。研究结果表明，正负压力与上述三个因素之间存在正相关关系。质量因子和截面因子对系统负压影响较为显著。不同质量和横截面因子下负压极值的最大增长率分别达到7.72和16.52%,分别。相比之下,粪便污泥的粘度对排水系统正压波动的影响略高，正压极值的最大增长率为3.41%。
