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首页> 外文期刊>SAE International Journal of Passenger Cars - Mechanical Systems >The Development of Turbine Volute Surface Temperature Models for 3D CFD Vehicle Thermal Management Simulations: Part 3: Exhaust Radial Turbine Volute Systems
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The Development of Turbine Volute Surface Temperature Models for 3D CFD Vehicle Thermal Management Simulations: Part 3: Exhaust Radial Turbine Volute Systems

机译：用于3D CFD车辆热管理仿真的涡轮蜗壳表面温度模型的开发：第3部分：排气径向涡轮蜗壳系统

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Modern exhaust systems contain not only a piping network to transport hot gas from the engine to the atmosphere, but also functional components such as the catalytic converter and turbocharger. The turbocharger is common place in the automotive industry due to their capability to increase the specific power output of reciprocating engines. As the exhaust system is a main heat source for the under body of the vehicle and the turbocharger is located within the engine bay, it is imperative that accurate surface temperatures are achieved. A study by K. Haehndel [1] implemented a 1D fluid stream as a replacement to solving 3D fluid dynamics of the internal exhaust flow. To incorporate the 3D effects of internal fluid flow, augmented Nusselt correlations were used to produce heat transfer coefficients. It was found that the developed correlations for the exhaust system did not adequately represent the heat transfer of the turbocharger. This paper addresses the fluid flow phenomena present in the turbine volute and applies augmented Nusselt correlations to accurately represent the heat transfer coefficients of the internal volute surface. Due to the broad range of operating conditions that are applicable to the turbocharger and the varied states of fluid flow that occur, algorithms are used to apply the appropriate Nusslet correlations and augmentations. Furthermore, the turbocharger extracts enthalpy from the working fluid; therefore to accurately calculate surface temperatures of downstream components and that of the turbocharger itself, an energy extraction model is used. Validation was conducted with four vehicle configurations. The hot-end of each configuration was aimed to be distinctly different to test the robustness of the prediction model. A tolerance range of +50/-20K was used for the study, however temperature differences were generally well within the tolerance range.
机译：现代排气系统不仅包含将热气从发动机传输到大气的管道网络，而且还包含催化转化器和涡轮增压器等功能组件。涡轮增压器由于能够提高往复式发动机的比功率输出而在汽车工业中很常见。由于排气系统是车辆底部的主要热源，并且涡轮增压器位于发动机舱内，因此必须实现精确的表面温度。 K. Haehndel [1]的一项研究实现了1D流体流，以解决内部排气流的3D流体动力学问题。为了合并内部流体流动的3D效果，使用了增强的Nusselt相关性来产生传热系数。已发现，排气系统的相关性不足以代表涡轮增压器的热传递。本文讨论了涡轮蜗壳中存在的流体流动现象，并应用了增强的Nusselt相关性来精确表示蜗壳内部表面的传热系数。由于适用于涡轮增压器的操作条件范围很广，并且出现了各种不同的流体流动状态，因此使用算法来应用适当的Nuslet相关和增强。此外，涡轮增压器从工作流体中提取焓。因此，为了精确计算下游组件的表面温度以及涡轮增压器本身的表面温度，使用了能量提取模型。验证使用了四种车辆配置。每种配置的热端旨在明显不同，以测试预测模型的鲁棒性。研究使用的公差范围为+ 50 / -20K，但是温度差异通常在公差范围内。

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