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首页> 外文期刊>SAE International Journal of Fuels and Lubricants >An Experimental Study of Gaseous Transverse Injection and Mixing Process in a Simulated Engine Intake Port
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An Experimental Study of Gaseous Transverse Injection and Mixing Process in a Simulated Engine Intake Port

机译：模拟发动机进气道内气态横向喷射混合过程的实验研究。

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The flow field resulting from injecting a gas jet into a crossflow confined in a narrow square duct has been studied under steady regime using schlieren imaging and laser Doppler velocimetry (LDV). This transparent duct is intended to simulate the intake port of an internal combustion engine fueled by gaseous mixture, and the jet is issued from a round nozzle. The schlieren images show that the relative small size of the duct would confine the development of the transverse jet, and the interaction among jet and sidewalls strongly influences the mixing process between jet and crossflow. The mean velocity and turbulence fields have been studied in detail through LDV measurements, at both center plane and several cross sections. The well-known flow feature formed by a counter rotating vortex pair (CVP) has been observed, which starts to appear at the jet exit section and persists far downstream contributing to enhancing mixing process. In addition, jets of different gases have been investigated with various injection orientations, aiming to fully understand the behaviors of transverse jet and the mixing process in the simulated intake port under wide practical conditions. Particularly, jet injection against crossflow has been found favorable in this study. The results show that the injection direction can influence the flow field remarkably, while the effect of injected gas is negligible, when the appropriate scaling is applied. A detailed description of the flow field inside a model intake port of an engine fueled with gaseous fuel is provided by the presented study and can be the basis for future comparison with computations.
机译：在稳定状态下，使用谢里伦成像和激光多普勒测速仪（LDV）研究了将气体喷射到狭窄的方管内的横流中而产生的流场。该透明导管旨在模拟以气体混合物为燃料的内燃机的进气口，并且从圆形喷嘴发出射流。 schlieren图像显示，相对较小的导管尺寸将限制横向射流的发展，射流与侧壁之间的相互作用强烈影响射流与横流之间的混合过程。通过LDV测量，已在中心平面和几个横截面上对平均速度和湍流场进行了详细研究。已经观察到由反向旋转涡流对（CVP）形成的众所周知的流动特征，该流动特征开始出现在射流出口部分，并持续向下游延伸，从而有助于增强混合过程。另外，已经研究了具有不同喷射方向的不同气体的射流，目的是在广泛的实际条件下充分了解横向射流的行为和模拟进气口的混合过程。特别地，在该研究中发现对抗横流的喷射注射是有利的。结果表明，当应用适当的缩放比例时，注入方向可以显着影响流场，而注入气体的影响可以忽略不计。本研究提供了对以气态燃料为燃料的发动机的模型进气口内部流场的详细描述，并且可以作为将来与计算进行比较的基础。

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