Effects of fuel injection speed on supersonic combustion using separation-resistant struts
Effects of fuel injection speed on supersonic combustion using separation-resistant struts
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DOI：
10.1063/5.0055104
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发表时间：
2021-06
期刊：
影响因子：
1.6
通讯作者：
T. Hiejima;Kaito Nishimura
中科院分区：
文献类型：
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作者：
T. Hiejima;Kaito Nishimura
本文描述了在高马赫数下使用超混合器支板时，使用流向涡量和燃料喷射实现的燃烧效率的改进。通过对化学反应流动的数值模拟和详细的反应机理，研究了燃油喷射条件对燃烧的影响。氢燃料从抗分离支柱的后缘喷射。在马赫数为2.5时，随着喷射角的增大，音速下的燃油喷射效率提高，但在马赫数为3.5时，没有观察到这种改进。结果表明，在高马赫数下，由于支板产生的强环流，氢在涡核中积聚。随着燃料喷射速度超过音速，效率增加，并进一步提高喷射角。结果表明，流向涡环量、燃料喷射速度和来流马赫数是燃烧强化的重要指标。为了使用支柱来增加燃烧效率，指示值应当超过阈值。这对于确保燃烧期间的有效燃料消耗至关重要。这些研究结果为超声速燃烧中超混合器支杆的设计提供了有益的启示。
This paper describes the improvement in combustion efficiency achieved using streamwise vorticity and fuel injections when using hypermixer struts at high Mach numbers. The effects of fuel injection conditions on combustion were investigated using numerical simulations of chemical reactive flows with a detailed reaction mechanism. Hydrogen fuel was injected from the trailing edges of a separation-resistant strut. Fuel injection at sonic speeds led to an enhancement in efficiency with an increased injection angle at Mach number 2.5, but this improvement was not observed at Mach number 3.5. It was found that hydrogen accumulated in the vortex core because of the strong circulation generated from the strut at high Mach numbers. With fuel injection at speeds exceeding the sonic speed, the efficiency increased, and it improved further with an increasing injection angle. From the results, an important indicator for combustion enhancement was derived from the streamwise vortex circulation, fuel injection velocity, and inflow Mach number. To increase the combustion efficiency using the strut, the indicator value should exceed a threshold. This is crucial for ensuring effective fuel consumption during combustion. These findings provide useful insights into a good design of hypermixer struts in supersonic combustion.