螺旋折流板换热管水力损失数值模拟及实验

Simulation and experimental study on head loss of heat exchanger pipe with helical baffles

提出了一种连续螺旋折流板换热管,对其内部流场进行了数值模拟,并进行了物理模型实验验证。得到了螺旋折流板换热管的水力损失系数变化规律,数值模拟结果与实验研究结果具有很好的一致性。影响螺旋折流板水力损失的主要因素是螺旋角,相同螺旋角的折流板换热管水力损失变化规律基本相同。对于一定管径的螺旋折流板换热管,存在水力损失系数最小的最优螺距,也就是存在水力损失最小的最优螺旋角。

A heat exchanger pipe with continuous helical baffles was proposed. Pressure distribution and head loss of the heat exchanger pipe were calculated. Numerical simulation results on head loss were consistent with physical model experiment. Loss coefficient curves of this baffled pipe were obtained and the spiral angles of the baffle were investigated in detail. The spiral angle of the baffle was the key factor of head loss coefficient and the head loss was almost the same for different pipes with the identical spiral angle. Head loss coefficient was related to the pitch of the helical baffle. There was an optimal spiral angle with the best pitch with the smallest head loss for this heat exchanger pipe.