多温区冷藏车回风导轨对厢内温度场的影响分析

Effect analysis of multi-temperature refrigerated trucks air return rail on temperature distribution inside the carriage

通过冷藏车多温区影响因素分析,建立多温区冷藏车的传热模型,利用计算流体力学方法研究回风导轨对车厢内温度场分布均匀性的影响规律。依靠Fluent软件,采用标准K-ε模型,开展空仓和载货两种状态下的数值模拟试验。结果表明:回风导轨的变化能够改变车厢内温度场分布;其对冷藏区温度场分布影响较大,对常温区温度分布影响较小。空仓状态下,导轨高度与温度不均匀系数近似呈"凸型曲线"分布;载货状态下,导轨高度与温度不均匀系数近似呈正比例线性分布。相比于X方向导轨,冷藏车采用Y方向导轨可以有效提高车厢温度分布均匀性。

A heat transfer model of the multi temperature refrigerated trucks was established based on analyzing the multi temperature refrigerated trucks influence factors. Difference of the temperature distribution under vary air return rail was analyzed with computational fluid dynamics technology. All the simulation experiments were carried out utilizing Fluent software constraint the standard K -- s model. The experimental results showed that air return raiI would affect the distribution of temperature field. And air return rail had greater influence on the refrigerated carriages than ordinary temperature carriages. Under no-load condition, rail height and temperature uniformity coefficient was approximately distributed as convex curve. Under the loading condition, rail height and temperature uniformity coefficient was approximately distributed as proportional linear distribution. Compared with the X direction rail, using Y direction rail could effectively improve the uniformity of temperature distribution inside carriages.