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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >CFD METHODOLOGY ASSESSMENT FOR THE INVESTIGATION OF CONVECTIVE HEAT TRANSFER PROPERTIES OF ENGINE COOLANTS UNDER BOILING CONDITIONS
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CFD METHODOLOGY ASSESSMENT FOR THE INVESTIGATION OF CONVECTIVE HEAT TRANSFER PROPERTIES OF ENGINE COOLANTS UNDER BOILING CONDITIONS

机译：沸腾条件下发动机冷却剂对流传热性能的CFD方法学评估

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The paper presents a combined experimental and numerical program directed at defining a cost/effective methodology for conjugate heat transfer CFD simulations of engine water cooling jackets.rnAs a first step in the process, deficiencies in current numerical strategies for the analysis of conjugate heat transfer problems under typical engine operating conditions are exposed and commented.rnResults are shown form a wide validation program based on the comparison between experimental measurements from a test facility at Villanova University and CFD predictions at the University of Modena.rnOn the experimental side, the test apparatus consists of a test section, pump, accumulator tank, rejection heat exchanger and required pumping. The test section is provided with a constant volumetric flow rate, and consists of a cylindrical aluminum body with a drilled horizontal flow channel. The section is heated by ten cartridge heaters located at a constant radial distance from the cylinder axis. The test section is connected to the flow loop by means of two calming sections, respectively at the cylinder inlet and exit.rnTwenty thermocouples are used to measure the test section local temperature along a radial plane cutting the cylinder.rnWater / ethylene-glycol binary mixture and pure water are tested and compared during the experimental program, in order to reproduce a set of thermal situations as close as possible to actual engine cooling system operation.rnOn the CFD side, an extensive program reproducing the experiments is carried out in order to assess the predictive capabilities of some of the most commonly used eddy viscosity models available in literature. Both non-evaporating and evaporating conditions are tested, showing severe limitations to the use of simplified boiling models to correctly capture the complex interaction between turbulent boundary layer and vapor bubble dynamics. In order to overcome the above stated deficiencies under boiling conditions, a methodology is then proposed to both improve the accuracy of the CFD forecasts and reduce the computational costs of the simulations. A few preliminary results from the validation process are shown and briefly discussed at the end of the paper.
机译：本文提出了一个结合实验和数值程序的程序，旨在为发动机水冷套的共轭传热CFD模拟定义一种经济/有效的方法。作为该过程的第一步，当前用于分析共轭传热问题的数值策略存在缺陷在典型的发动机工况下进行了公开和评论。rn结果是根据维拉诺瓦大学测试设施的实验测量结果与摩德纳大学CFD预测结果之间的比较结果，通过广泛的验证程序显示的。测试部分，泵，蓄能箱，废热换热器和所需的泵送。测试部分具有恒定的体积流量，并由带有钻孔水平流动通道的圆柱形铝制主体组成。该部分由十个筒形加热器加热，该筒形加热器距离气缸轴线的径向距离恒定。测试部分通过两个稳定部分分别连接到流量环路上，分别位于钢瓶的入口和出口处。使用二十个热电偶沿着沿切割钢瓶的径向平面测量测试部的局部温度.rn水/乙二醇二元混合物在实验程序中对纯净水和纯水进行测试和比较，以便再现尽可能接近实际发动机冷却系统运行的热状况。在CFD端，进行了广泛的程序再现实验以评估一些文献中最常用的涡流粘度模型的预测能力。测试了非蒸发和蒸发条件，这显示了使用简化沸腾模型来正确捕获湍流边界层和蒸汽泡动力学之间复杂相互作用的严格限制。为了克服在沸腾条件下的上述缺陷，然后提出一种方法来提高CFD预测的准确性并降低模拟的计算成本。本文末尾显示并简要讨论了验证过程的一些初步结果。

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