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首页> 外文期刊>Journal of Fluid Science and Technology >Experimental and numerical investigation of a pulsatile flow field in an S-shaped exhaust pipe of an automotive engine
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Experimental and numerical investigation of a pulsatile flow field in an S-shaped exhaust pipe of an automotive engine

机译：汽车发动机S形排气管内脉动流场的实验与数值研究

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摘要

A pulsatile turbulent flow within an S-shaped double bend pipe is experimentally and numerically studied to characterize the flow field in conditions resembling an automotive engine environment. Particle image velocimetry (PIV) measurements were carried out to measure streamwise and secondary flow velocities. The flows are accelerated around the inner side walls of both bends. The secondary flow, after passing through the second bend, is directed toward the inner side in the core of the cross section, and, as a result, Lyne-type vortices, which are not consistent with the second bend curvature, are formed. A numerical simulation is performed under the same condition as the experiments with computational fluid dynamics software. The numerical simulation gives qualitative results in comparison with the experimental data though there is some deviation, and shows the cause of the Lyne-type vortex formation in the second bend. After passing through the first bend, the high-speed region appearing around the inner side shifts in accordance with the Dean-type secondary flow formed in the first bend, and thus the non-uniform flow enters the second bend. In the second bend, the low-velocity region in which the centrifugal force is not strong enough to direct the flow toward the outer side, appears in the core of the cross section. Details of the Lyne-type vortex formation are discussed by considering the driving forces of the secondary flow.
机译：对S形双弯管内的脉动湍流进行了实验和数值研究，以表征类似于汽车发动机环境的流场。进行颗粒图像测速（PIV）测量以测量流向和次级流速。绕两个弯头的内侧壁加速流动。在通过第二弯曲部之后，二次流被引导到横截面的芯部的内侧，结果，形成了与第二弯曲部曲率不一致的Lyne型涡旋。使用计算流体动力学软件在与实验相同的条件下进行数值模拟。尽管存在一些偏差，但与实验数据相比，数值模拟给出了定性结果，并显示了第二弯处的Lyne型涡旋形成的原因。在通过第一弯头之后，内侧附近出现的高速区域根据在第一弯头中形成的迪安型二次流而移动，因此，不均匀的流进入第二弯头。在第二个弯头中，在离心力不足以将流体引向外侧的低速区域出现在横截面的中心。通过考虑二次流的驱动力来讨论Lyne型涡旋形成的细节。

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