CAJ | 학술논문

基于N-S方程和标准k-ε湍流模型,采用SIMPLEC法,对离心叶轮三维固液两相流场进行了耦合计算,得到了固相(颗粒)不同粒径、不同体积浓度不同密度以及不同流量时的固相(颗粒)浓度分布,并研究了外特性的变化规律.模拟结果表明,颗粒本身的性质密度、粒径对颗粒的分布及运动规律影响较大,密度、粒径越大的颗粒在惯性力作用下易偏向工作面;颗粒体积浓度对颗粒的分布略有影响;泵在非设计工况下运行时,相对进口液流角的变化影响了颗粒在叶轮内的分布情况;颗粒密度、粒径、固相体积浓度的增大会引起扬程的减小.
기우N-S방정화표준k-ε단류모형,채용SIMPLEC법,대리심협륜삼유고액량상류장진행료우합계산,득도료고상(과립)불동립경、불동체적농도불동밀도이급불동류량시적고상(과립)농도분포,병연구료외특성적변화규률.모의결과표명,과립본신적성질밀도、립경대과립적분포급운동규률영향교대,밀도、립경월대적과립재관성력작용하역편향공작면;과립체적농도대과립적분포략유영향;빙재비설계공황하운행시,상대진구액류각적변화영향료과립재협륜내적분포정황;과립밀도、립경、고상체적농도적증대회인기양정적감소.
In order to study solid-liquid 3-D two-phase turbulent flow in a pump, the SIMPLEC algorithm was used with the casing to calculate the coupling question of a centrifugal impeller based on N-S equations and the standard two equations k-ε turbulent model.From the computed information, the distribution of solid particles of different particle sizes and different volume fractions, at off-design conditions and different specific gravities were obtained, and the characteristic of pump was also calculated.The results indicated that specific gravity and particle diameter, which are the nature of particles, had more influence on the distribution of solid particles.Particles with large specific gravity value and diameter were easy to trend to working face by the effect of inertia force.The volume fraction also had an effect in particle distribution; because of relative flow angle changing in off-design conditions, particles had different distribution and movement laws.Increasing specific gravity, particle size and solid-phase volume would cause the reduction of head.