Numerical study on unsteady characteristics of high-pressure hydrogen jet ejected from a pinhole
Numerical study on unsteady characteristics of high-pressure hydrogen jet ejected from a pinhole
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DOI：
10.1016/j.ijhydene.2022.05.079
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发表时间：
2022-09
影响因子：
7.2
通讯作者：
M. Asahara;T. Iwasa;N. Tsuboi;A. Hayashi
中科院分区：
文献类型：
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作者：
M. Asahara;T. Iwasa;N. Tsuboi;A. Hayashi
本研究的目的是描绘高压氢气射流的非定常流体动力学，以澄清强制点火位置和高压氢气射流从小孔泄漏的火焰发展特性之间的关系。采用可压缩多组分气体的Navier-Stokes方程，模拟了高压（82 MPa）氢气射流通过直径为0.2 mm的小孔喷入大气的非定常过程。结果表明，在射流底部的扑动射流形成了一个高浓度的氢气云，流向下游。氢浓度和速度的时空分布之间的相关性进行了观察。通过模拟得到的非定常高压氢气射流将用于后续的研究，重点是在强制点火下的火焰发展。
The aim of this study was to delineate the unsteady fluid dynamics of the high-pressure hydrogen jet to clarify the relationship between the forced ignition position and the flame development characteristics in a high-pressure hydrogen jet leaking from a pinhole. The Navier–Stokes equation for a compressible multi-component gas was used to simulate a high-pressure (82 MPa stagnation pressure) unsteady hydrogen jet ejected into the atmosphere through a pinhole (diameter = 0.2 mm). The results indicated that the flapping jet at the base of the jet formed a cloud of highly concentrated hydrogen that flowed downstream. A correlation was observed between the spatio-temporal distribution of hydrogen concentration and velocity was observed. The unsteady high-pressure hydrogen jet obtained by simulation will be used in subsequent studies focusing on flame development under forced ignition.