CAJ | 학술논문

建立了U型管式换热器进口截面的三维稳态流动数学模型，求得了U型管式换热器内部的压力场、速度场和温度场分布；在此基础上对U型管式换热器内部的温度场、压力场和速度场进行了讨论。研究结果表明，一方面，增大U型管式换热器进口热流体速度，可以增加U型管式换热器的换热量，增大出口截面的速度，增大内部压强，提高内部温度；另一方面，运行时间越长，U型管式换热器内部温度越低、出口截面速度越大，总传热率越低，压力损失先减小后趋于稳定；同时，离U型管换热器越近的外导流筒冲刷腐蚀越严重。
건립료U형관식환열기진구절면적삼유은태류동수학모형，구득료U형관식환열기내부적압력장、속도장화온도장분포；재차기출상대U형관식환열기내부적온도장、압력장화속도장진행료토론。연구결과표명，일방면，증대U형관식환열기진구열류체속도，가이증가U형관식환열기적환열량，증대출구절면적속도，증대내부압강，제고내부온도；령일방면，운행시간월장，U형관식환열기내부온도월저、출구절면속도월대，총전열솔월저，압력손실선감소후추우은정；동시，리U형관환열기월근적외도류통충쇄부식월엄중。
The three-dimensional steady flow mathematical model about inlet section of U tube type heat exchanger was established, and then the pressure field distribution, temperature field distribution and velocity field distribution of the U type heat exchanger were obtained by the model. Based on this, the pressure field, temperature field and velocity field of the U type heat exchanger were discussed. The results show that, increasing inlet velocity of hot fluid in the U type heat exchanger, for one thing ,can increase heat exchange;for another, the longer the running time, the lower the internal temperature of the heat exchanger,the higher the outlet velocity, the lower the total heat transfer rate, the pressure loss first decreases and then tends to stability;corrosion erosion effect in all regions of U type heat exchanger is enhanced, especially the area between the U type heat exchanger inlet and the casing wall.