圆弧形凸台板式热交换器传热及流阻性能数值分析

采用计算流体动力学模拟方法,对板式热交换器圆弧形凸台板片进行数值模拟,并将烟气出口温度模拟结果与相关文献中的试验数据进行比对分析,验证了数值模拟的准确性。运用Fluent软件,对圆弧形凸台板片烟气侧传热和流阻性能进行数值模拟分析。不同凸台倾角时流道内温度场和压力场的分布情况表明,随着凸台倾角的减小,热交换器传热效果变好,但流动阻力变大。凸台间距减小及凸台高度增大时,热交换器传热及流阻性能变化情况具有同样规律。拟合了热交换器传热和流阻性能变化曲线,归纳了各几何参数对热交换器传热和流阻性能的影响规律,可为板片优化设计提供依据。

Numerical Study of Heat Transfer and Flow Resistance Performance of Circular Arc Boss Plate Heat Exchanger

Computational fluid dynamics simulation method was used to simulate the circular arc boss plate of plate heat exchanger.The simulation results of outlet temperature of flue gas were compared with the test data in relevant literatures to verify the accuracy of the numerical simulation.By using Fluent software,the heat transfer and flow resistance performance of circular arc boss plate at flue gas side were simulated and analyzed.According to the distribution of temperature field and pressure field in the flow channel at different boss inclination angles,the heat transfer effect of the heat exchanger becomes better with a larger flow resistance as the boss inclination angle decreases.When the boss spacing decreases and the boss height increases,the same rules are observed from the heat transfer and resistance performance change of the heat exchanger.The curves of heat transfer and flow resistance performance of heat exchanger were fitted,the influence of geometric parameters on heat transfer and flow resistance performance of heat exchanger was summarized,which could provide basis for plate optimization design.