连续型螺旋折流板换热器结构及性能研究

连续型螺旋折流板换热器一直受限于加工工艺而未能得到广泛应用，本文提出采用加装中芯管的方法，实现了连续型折流板的加工，并给出了连续型折流板螺旋升角和螺旋包络面的计算方法。利用Fluent软件，与现今应用较广泛的1／4椭圆形折流板换热器的流动和换热特性进行模拟比较。结果表明，连续型折流板换热器换热能力提高了近一倍，综合性能系数也提高了近30％，虽然1／4椭圆折流板压力降较小，但其折流板的漏流，也严重降低了传热能力。为在工程中推广应用连续型螺旋折流板换热器，本文提供了理论依据和技术支撑。

Research of Heat Exchanger Structure and Performance with Continuous Helical Shaped Baffles

Heat exchanger with continuous helical shaped baffles is not widely used because of manufacturing process difficuty. The article introduces a new approach of central tube configuration and proposes a new design method based on the spiral angle and helical enveloping surface of continuous helical baffle plate. The pressure drop in shell, the heat transfer coefficient for continuous helical baffle heat exchanger and widely used quarter - ellipse helical baffle heat exchanger are calculated with Fluent software. The simulation results show that the heat transfer capability of heat exchanger with the continuous helical baffle has been doubled, and the combined performance is 30 percent higher than that of heat exchanger with quarter- ellipse helical baffle. The leakage among baffles decreases the pressure drop of quarter- ellipse helical baffle heat exchanger, but reduces the heat transfer capability at the same time. This research is helpful to technological progress and application of the continuous helical baffle heat exchanger.