Abstract:

Double torsion flow heat exchanger is a new type of shell-and-tube heat exchanger. The periodic full-section calculation models of trapezoidal baffle heat exchangers and new double torsion flow heat exchangers are established respectively. The computational fluid dynamics (CFD) method is used to numerically study the heat transfer coefficient, flow resistance and comprehensive performance of the shell side. The results show that at the same mass flow rate in the shell side, the heat transfer coefficient of the double torsion flow heat exchanger is reduced by 24.4%—27.9%, the pressure drop is reduced by 63.3%—71.0%, and the overall performance is increased 1.2%—4.1% compared with the trapezoidal baffle heat exchanger. The heat transfer and resistance reduction mechanism are analyzed through the principle of field synergy, and it is shown that the speed and pressure gradient of the double torsion flow heat exchanger are in good coordination, and the speed and temperature gradient of the torsion flow heat exchanger are in good coordination. The cold model test was carried out on the torsion flow heat exchanger, and the laser Doppler velocimeter (LDV) was used to measure the speed on the verification line, which verified the correctness and accuracy of the simulation method and results. The research models and conclusions in this paper can provide references for the structure development and performance research of heat exchangers.

Key words: double torsion flow heat exchanger, computational fluid dynamics, field synergy principle, laser Doppler velocimeter

摘要：

双扭转流换热器是一种新型管壳式换热器，分别建立扭转流换热器和新型双扭转流换热器的周期全截面计算模型，利用计算流体力学（CFD）方法对壳体侧的传热系数、流动阻力和综合性能进行了数值研究。结果表明：在壳程同等质量流量下，双扭转流换热器传热系数与类梯形折流板换热器相比降低24.4%~27.9%，压降降低63.3%~71.0%，综合性能增加1.2%~4.1%。通过场协同原理对其传热和降阻机理进行了分析，表明双扭转流换热器速度与压力梯度协同较好，扭转流换热器速度与温度梯度协同性较好。对扭转流换热器进行冷模实验，采用激光多普勒测速仪（LDV）对线上速度进行测量，验证了仿真方法和结果的正确性和准确性。研究模型与结论可为换热器的结构开发与性能研究提供参考。

关键词: 双扭转流换热器, 计算流体力学, 场协同原理, 激光多普勒测速仪