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首页> 外文会议>Vehicle aerodynamics, 2012. >Experimental and Numerical Investigation of the Under Hood Flow with Heat Transfer for a Scaled Tractor-Trailer
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Experimental and Numerical Investigation of the Under Hood Flow with Heat Transfer for a Scaled Tractor-Trailer

机译：伸缩式挂车发动机罩下传热实验与数值研究

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摘要

Aerodynamic design and thermal management are some of the most important tasks when developing new concepts for the flow around tractor-trailers. Today, both experimental and numerical studies are an integral part of the aerodynamic and thermal design processes. A variety of studies have been conducted how the aerodynamic design reduces the drag coefficient for fuel efficiency as well as for the construction of radiators to provide cooling on tractor-trailers. However, only a few studies cover the combined effect of the aerodynamic and thermal design on the air temperature of the under hood flow [8, 13,16,17, 20]. The objective of this study is to analyze the heat transfer through forced convection for a scaled Cab-over-Engine (CoE) tractor-trailer model with under hood flow. Different design concepts are compared to provide low under hood air temperature and efficient cooling of the sub components. The measured data have been used to validate the computational simulations performed with STAR-CCM+. At first, the experimental and numerical investigation of a transitionally rough surface on a flat plate with zero pressure gradient at high Reynolds number is presented to understand more about the boundary layer profile and skin friction coefficient. Furthermore, a generic study examines the temperature field of the near-wake flow for a heated surface-mounted block. In the main experimental and numerical part of the work, some first results of the heat transfer for the scaled tractor-trailer model with under hood flow are given. In the experiments, hot air has been generated by flowing through a heated scaled radiator to investigate the effect of the under hood mass flow by covering the inlet. For the standard configuration the measured air temperature distribution after the heat exchanger and under hood side wall inside the engine compartment as well as the drag coefficient has been compared to the numerical results.
机译：在为拖挂车周围的气流开发新概念时，空气动力学设计和热管理是最重要的任务。如今，实验研究和数值研究已成为空气动力学和热设计过程不可或缺的一部分。空气动力学设计如何降低阻力系数以提高燃油效率以及建造散热器以在拖车上提供冷却的各种研究已经开展。然而，只有很少的研究涵盖了空气动力学和热设计对发动机罩下气流温度的综合影响[8，13,16,17，20]。这项研究的目的是分析具有发动机罩下流量的按比例缩放的机舱发动机（CoE）拖拉机-拖车模型通过强制对流进行的热传递。比较了不同的设计概念，以提供较低的引擎盖下空气温度和有效的副组件冷却。测量数据已用于验证使用STAR-CCM +进行的计算仿真。首先，对高雷诺数下具有零压力梯度的平板上的过渡粗糙表面进行了实验和数值研究，以进一步了解边界层轮廓和皮肤摩擦系数。此外，一项通用研究检查了加热的表面安装式块的近尾流的温度场。在工作的主要实验和数值部分中，给出了在发动机罩下流动的按比例缩放的拖挂车模型的传热的一些初步结果。在实验中，通过流经加热的定标散热器产生了热空气，以通过覆盖进气口来研究发动机罩下质量流的影响。对于标准配置，已将热交换器后和发动机舱内发动机罩侧壁下方的测得的空气温度分布以及阻力系数与数值结果进行了比较。

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