CAJ | 학술논문

运用C FD 数值模拟的方法，通过编写自定义函数来设置气液质量转移源项、能量源项和管外壁温度边界条件，对简化后的跨临界CO 2热泵热水器中蒸发器进行了数值模拟，得到了管内二氧化碳的温度场、压力场和气液相分布。模拟结果表明：CO 2流体在进入弯管前已出现干涸现象，但进入弯管后干涸现象消失，液相气化速度变缓，出弯后重新恢复正常气化过程；CO 2在管上部的气化速度要大于管下部，同时由于管壁换热作用，管四周的气化速度要大于管中心位置。
운용C FD 수치모의적방법，통과편사자정의함수래설치기액질량전이원항、능량원항화관외벽온도변계조건，대간화후적과림계CO 2열빙열수기중증발기진행료수치모의，득도료관내이양화탄적온도장、압력장화기액상분포。모의결과표명：CO 2류체재진입만관전이출현간학현상，단진입만관후간학현상소실，액상기화속도변완，출만후중신회복정상기화과정；CO 2재관상부적기화속도요대우관하부，동시유우관벽환열작용，관사주적기화속도요대우관중심위치。
The sim plified CO2 evaporator w as sim ulated through com piling UDF (U ser-D efined Function)to setm ass transfer source team , energy source term and tem perature boundary condition on outside w all of tube, by using the m ethod of C FD .Tem perature field,pressure field and phase distribution in CO2 evaporator w as revealed.The results of sim ulation show ed that the dry-up phenom ena appears before CO2 entering the curved part of the pipe and disappears in the curved part of the pipe. Furtherm ore, the speed of CO2 gasification in the top of the pipe is faster than that in the bottom of the pipe. As the role of heat transfer in the w all of the pipe, the speed of CO2 gasification around the pipe is also fasterthan thatin the centerofthe pipe.