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首页> 外文期刊>SAE International Journal of Engines >Advanced Numerical/Experimental Methods for the Analysis of a Waste-Gated Turbocharger Turbine
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Advanced Numerical/Experimental Methods for the Analysis of a Waste-Gated Turbocharger Turbine

机译：废气门涡轮增压器涡轮分析的先进数值/实验方法

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In the paper the results of an experimental campaign regarding the steady characterization of a turbocharger waste-gated turbine (IHI-RHF3) for gasoline engine application are presented. The turbine behavior is analyzed in a specialized test rig operating at the University of Genoa, under different openings of the waste-gate valve. The test facility allows to measure inlet and outlet static pressures, mass flow rate and turbocharger rotational speed. The above data constitute the basis for the tuning and validation of a numerical procedure, recently developed at the University of Naples, following a 1D approach (1D turbine model - 1DTM). The model geometrically schematizes the entire turbine based on few linear and angular dimensions directly measured on the hardware. The 1D steady flow equations are then solved within the stationary and rotating channels constituting the device. All the main flow losses are properly taken into account in the model. A preliminary tuning is carried out based on the characteristic map measured for a completely closed waste-gate valve. A 1D schematization of the experimental test rig is implemented within the commercial GT-Power software, including the turbine, the waste-gate and the upstream and downstream circuits. In particular, the turbine model itself consists of a sequence of pipes that schematize each component of the device (inlet/outlet ducts, volute and wheel). The pipes dimensions are automatically provided by the geometrical module of the 1 DTM. In the turbine schematization, the "wheel-map", estimated by means of the above mentioned 1DTM, is utilized. The latter does not take into account phenomena and losses occurring in the volute and in the intake/outlet ducts, as well. A refined modeling of the waste-gate system reveals to be necessary to correctly reproduce the swallowing capacity of the by-pass port. The waste-gate model is tuned against the experimental findings for a completely closed turbine wheel and various settings of the by-pass port. Finally, once the 1D models of the turbine and of the waste-gate system are independently tuned, their behavior under parallel flow is analyzed. The proposed numerical and experimental results demonstrate the mutual interaction of the two components. In addition, it is put into evidence that turbine and waste-gate circuit cannot be considered as two systems working in parallel under the same pressure ratio, as usually assumed in 1D codes.
机译：在本文中，提出了有关用于汽油发动机的涡轮增压器废气门涡轮（IHI-RHF3）的稳​​定特性的实验结果。在热那亚大学（University of Genoa）的专用测试设备中，在废气闸阀的不同开口下分析涡轮的性能。该测试设备可以测量入口和出口的静压力，质量流量和涡轮增压器的转速。以上数据构成了采用一维方法（一维涡轮模型-1DTM）在那不勒斯大学最近开发的数值程序的调整和验证的基础。该模型基于在硬件上直接测量的少量线性和角度尺寸，以几何方式示意了整个涡轮机。然后，在构成该设备的固定通道和旋转通道中求解一维稳态流量方程。在模型中适当考虑了所有主要流量损失。根据为完全关闭的废气门阀测得的特性图进行初步调整。在商用GT-Power软件中实现了实验测试台的一维示意图，包括涡轮机，废气门以及上游和下游回路。特别是，涡轮机模型本身由一系列管道组成，这些管道示意了设备的每个组件（入口/出口管道，蜗壳和叶轮）。管道尺寸由1 DTM的几何模块自动提供。在涡轮机图解中，利用了通过上述1DTM估算的“轮图”。后者没有考虑蜗壳和进气/排气管中也出现的现象和损失。废气门系统的精确建模显示出正确再现旁路端口的吞咽能力是必要的。废气门模型针对完全封闭的涡轮机叶轮和旁路端口的各种设置的实验结果进行了调整。最后，一旦涡轮机和废气门系统的一维模型得到独立调整，就可以分析它们在平行流下的行为。拟议的数值和实验结果证明了这两个组件的相互影响。此外，有证据表明，不能将涡轮和废气门回路视为在相同的压力比下并行工作的两个系统，这通常是一维代码中假定的。

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