采用STAR-CCM+软件。数值模拟超临界甲烷在不同截面形状微通道内的对流换热过程，研究截面形状、截面面积、入口质量通量以及压力对其流动换热的影响。通过对比相关实验结果，验证仿真的准确性。研究发现：截面积相同时，正方形通道的换热系数最高；截面积为0.64 mm2时，半圆形与椭圆形性能评价指标（performance evaluation criterion，PEC）较大，换热与压降综合性能较好；随着截面积的增大，整体换热系数与PEC先减小后增大，半圆形与椭圆形在截面积较小时综合性能较好，正方形与圆形反之；壁面与甲烷的温差随质量通量的增大而减小，通道整体换热系数增大；随着压力升高，整体换热系数增大，PEC却随之减小。
Using STAR-CCM+ software, the convective heat transfer process of supercritical methane in the microchannels of different cross-sectional shapes was simulated numerically, and the influence of cross-section shape, cross-section area, inlet mass flux and pressure on its flow heat transfer was studied, and the accuracy of the simulation was verified by comparing the relevant experimental results. The study found that: when the cross-sectional area is the same, the heat transfer coefficient of the square channel is the highest, and when the cross-sectional area is 0.64 mm2, the performance evaluation index of the semicircle and the oval (PEC) is larger, and the comprehensive performance of heat transfer and pressure drop is better; with the increase of the cross-sectional area, the overall heat transfer coefficient and PEC are reduced first and then increased, and the comprehensive performance of the semicircle and the oval is better when the cross-sectional area is small, and the square and the circle are reversed The temperature difference between the wall surface and methane decreases with the increase of mass flux, and the overall heat transfer coefficient of the channel increases; with the increase of pressure, the overall heat transfer coefficient increases, but the PEC decreases.
2023,45(13): 53-58 收稿日期：2022-03-07
DOI：10.3404/j.issn.1672-7649.2023.13.011
分类号：U664.53
基金项目：国家重点研发计划资助项目(2018YFC0310400)
作者简介：谷家扬(1979-)，男，博士，教授，研究方向为船舶与海洋工程总体设计
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