Mixing Characteristics of Inclined Fuel Injection via Various Geometries for Upstream-Fuel-Injected Scramjets

Hideaki Ogawa

doi:10.2514/1.b35581

Mixing Characteristics of Inclined Fuel Injection via Various Geometries for Upstream-Fuel-Injected Scramjets

Journal of Propulsion and Power ◽

10.2514/1.b35581 ◽

2015 ◽

Vol 31 (6) ◽

pp. 1551-1566 ◽

Cited By ~ 11

Author(s):

Hideaki Ogawa

Keyword(s):

Fuel Injection ◽

Mixing Characteristics

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Mixing Characteristics in a Supersonic Combustor with Gaseous Fuel Injection Upstream of a Cavity Flameholder

Flow Turbulence and Combustion ◽

10.1007/s10494-008-9178-7 ◽

2008 ◽

Vol 82 (2) ◽

pp. 271-286 ◽

Cited By ~ 47

Author(s):

Ming-bo Sun ◽

Hui Geng ◽

Jian-han Liang ◽

Zhen-guo Wang

Keyword(s):

Fuel Injection ◽

Gaseous Fuel ◽

Mixing Characteristics

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Investigation on Mixing Characteristics of Methane Fuel in Low Emission Combustor

Volume 4A: Combustion, Fuels, and Emissions ◽

10.1115/gt2020-14342 ◽

2020 ◽

Author(s):

Enhui Liu ◽

Xiao Liu ◽

Hongtao Zheng ◽

Jinghe Lu ◽

Zhihao Zhang ◽

...

Keyword(s):

Gas Turbine ◽

Recirculation Zone ◽

Fuel Injection ◽

Near Field ◽

Velocity Ratio ◽

Pollutant Emission ◽

Windward Side ◽

Leeward Side ◽

Low Emission ◽

Mixing Characteristics

Abstract With the increasingly environmental problems and strict pollutant emission limits, pollutant emission has become a critical consideration for gas turbine. Mixing uniformity index of fuel-air has a significant effect on NOx emission. Previous works conducted basic research on mixing mechanism based on jet in crossflow, while few people studied a single real swirler channel in gas turbine combustor. The present work aims to bridge this gap and investigates the effects of fuel injection from the windward and leeward sides on the fuel concentration distribution and mixing uniformity index, based on a typical radical swirler channel. The qualitative analysis of velocity field and vortices structure and the quantitative analysis of velocity ratio and uniformity index are carried out. Due to the presence of sharp corner at the inlet of swirler, a recirculation zone is formed by the flow separation. The recirculation zone at the leeward side decreases the flow velocity and increases the area and time for fuel-air mixing. The velocity ratio plays a key role in the characteristics of flow and mixing. Under the same inlet conditions, the effective velocity ratio (R = 40) in the near field of the leeward side is about 10 times that of windward side (R = 4), and the maximum jet depth can be achieved in the near field. Therefore, the outlet uniformity index on the windward and leeward sides are 38.85% and 49.43%, respectively. From the perspective of mixing uniformity, fuel injection from the leeward side is beneficial to realize quick mixing in short distance. The present study is expected to provide insightful information for understanding mixing characteristics of methane fuel in low emission combustor.

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