CAJ | 학술논문

采用雷诺时均N-S方程和RNG k-ε湍流模型,使用多相流模型中的混合物模型,通过商用软件FLUENT,对自吸时旋流自吸泵内气液两相流场作了数值模拟.在对蜗壳流道和叶轮流道进行网格划分时,尺寸扭曲率为0.78.根据模拟结果,将泵内两相流场的静压分布,与单液相时的静压分布作了对比,并比较了叶轮内气相与液相相对速度的分布情况.另外,对含气率的分布情况作了分析.结果表明,自吸时气液两相状态下的静压稍小于单液相状态下的静压;泵内的主要流动是液相通过相间作用夹带气相的流动,液相速度略大于气相速度;靠近泵出口的两个叶道内,有气相的积聚,含气率较高.
채용뢰낙시균N-S방정화RNG k-ε단류모형,사용다상류모형중적혼합물모형,통과상용연건FLUENT,대자흡시선류자흡빙내기액량상류장작료수치모의.재대와각류도화협륜류도진행망격화분시,척촌뉴곡솔위0.78.근거모의결과,장빙내량상류장적정압분포,여단액상시적정압분포작료대비,병비교료협륜내기상여액상상대속도적분포정황.령외,대함기솔적분포정황작료분석.결과표명,자흡시기액량상상태하적정압초소우단액상상태하적정압;빙내적주요류동시액상통과상간작용협대기상적류동,액상속도략대우기상속도;고근빙출구적량개협도내,유기상적적취,함기솔교고.
Gas-liquid two-phase flow of a vortex flow self-priming pump under self-priming condition was simulated by using reynolds time-averaged N-S equations, RNG k-ε turbulent model, and mixer model of multi-phase models in FLUENT. When the channel of impeller and volute were meshed, the size distortion rate was 0.78. The static pressure distribution of the pump from two-phase flow simulation was compared with that from single phase flow, and the relative velocities of the impeller between gas phase and liquid phase were compared. The distribution of gas volume fraction was analyzed. The results show that the static pressure of gas-liquid two-phase is slightly less than that of single-phase when self-priming. The main flow of the pump is the flow of liquid phase with the flow of gas through the phase entrainment effect.Liquid velocity is slightly larger than that of gas. The two channels near the outlet of the pump have obvious gas accumulation with higher gas voids.