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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental verification of hydrodynamic similarity in hot flows
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Experimental verification of hydrodynamic similarity in hot flows

机译：热流中流体动力相似性的实验验证

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This paper examines a common hypothesis in the design of internal combustion engine exhaust lines, namely that the ratio of the total pressure drop across the line to the inlet dynamic head should be a function only of the Reynolds number. While incompressible flow theory, provided that some simplifications are considered, is often used in support of this hypothesis, detailed experimental verification in actual exhaust lines is absent from the literature. Production exhaust lines contain non-trivial flow complexities such as muffler devices and catalytic converters and, in the case of high-performance engines, often operate at high temperature and high mass flow conditions, thereby rendering the usual theoretical simplifications doubtful. In this work, a production exhaust line composed of cold and hot ends, featuring a muffler and a catalytic converter, is tested at a variety of conditions. Analysis of the results shows that compressibility corrections must be factored in at certain conditions routinely found in actual high-performance engines, and that for hot ends, laminar flow at the converter monolith channels may pose a challenge to the hydrodynamic similarity hypothesis.
机译：本文介绍了内燃机排气管路设计中的常见假设，即跨线到入口动态头的总压降的比例应该是雷诺数的函数。虽然不可压缩的流动理论，但考虑了一些简化，通常用于支持这一假设，因此在文献中缺乏实际排气管线的详细实验验证。生产排气管线含有非平凡的流量复杂性，如消声器装置和催化转换器，并且在高性能发动机的情况下，通常在高温和高质量流量条件下操作，从而使通常的理论简化可疑。在这项工作中，在各种条件下测试由冷热端部和催化转化器的冷热端组成的生产排气管线。结果分析表明，必须在实际高性能发动机中经常发现的某些条件中对压缩性校正，并且对于热端，转换器整极通道处的层流可能对水动力相似性假设构成挑战。

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