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Experimental verification of hydrodynamic similarity in hot flows
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.expthermflusci.2020.110220
A.J. Torregrosa , A. Broatch , J. García-Tíscar , F. Roig

Abstract 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.

中文翻译:

热流中水动力相似性的实验验证

摘要 本文检验了内燃机排气管路设计中的一个常见假设,即管路上的总压降与进气动态压头的比率应仅是雷诺数的函数。虽然不可压缩流动理论,如果考虑到一些简化,经常被用来支持这个假设,但文献中没有在实际排气管线中进行详细的实验验证。生产排气管线包含非平凡的流动复杂性,例如消声器装置和催化转化器,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运行,从而使通常的理论简化令人怀疑。在这项工作中,由冷热端组成的生产排气线,具有消声器和催化转化器,在各种条件下进行了测试。结果分析表明,在实际高性能发动机中经常发现的某些条件下,必须考虑压缩率修正,对于热端,转换器整体通道处的层流可能对流体动力学相似性假设构成挑战。
更新日期:2020-11-01
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