Effect of fuel property on the ignition and combustion characteristics of prechamber ignition

Yamashita, Riku; Waku, Satoshi; Mori, Daisuke; Ueno, Seiya; Tanoue, Kimitoshi; Moriyoshi, Yasuo

doi:10.1299/jtst.2021jtst0014

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…The structures of the afterburner components are often complex, which increases the weight of the engine and the flow loss of the engine's main flow. One solution is an integrated structure design [6][7][8]. Concurrently, the development of aeroengine technology and the improvement of aircraft maneuvering performance have led to the flight envelopes of aircraft becoming increasingly wider.…”

Section: Introductionmentioning

confidence: 99%

Application study on plasma ignition in aeroengine strut–cavity–injector integrated afterburner

Fei

Zhao

Liu

et al. 2021

Plasma Sci. Technol.

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To increase the thrust-weight ratio in next-generation military aeroengines, a new integrated afterburner was designed in this study. The integrated structure of a combined strut-cavity-injector was applied to the afterburner. To improve ignition characteristics in the afterburner, a new method using a plasma jet igniter was developed and optimized for application in the integrated afterburner. The effects of traditional spark igniters and plasma jet igniters on ignition processes and ignition characteristics of afterburners were studied and compared with the proposed design. The experimental results show that the strut-cavity-injector combination can achieve stable combustion, and plasma ignition can improve ignition characteristics. Compared with conventional spark ignition, plasma ignition reduced the ignition delay time by 67 ms. Additionally, the ignition delay time was reduced by increasing the inlet velocity and reducing the excess air coefficient. This investigation provides an effective and feasible method to apply plasma ignition in aeroengine afterburners and has potential engineering applications.

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Section: Introductionmentioning

confidence: 99%

Application study on plasma ignition in aeroengine strut–cavity–injector integrated afterburner

Fei

Zhao

Liu

et al. 2021

Plasma Sci. Technol.

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Modeling and Experimental Validation of Prechamber Jet Penetration Considering Jet Density and Ejection Pressure Variations

Wu,

Moriyoshi,

et al. 2024

Journal of Engineering for Gas Turbines and Power

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Although pre-chamber (PC) is regarded as a promising solution to enhance ignition in lean-burn gas engines, a lack of comprehensive understanding of PC jet penetration dynamics remains. This study proposed a zero-dimensional (0-D) model for PC jet penetration, considering the mixing of combustion products and unburned gases and floating ejection pressure. A combustion completion degree was defined employing fuel property and heat release to estimate varying jet density. Pressure differences between PC and the main chamber (MC) were referred to as the ejection pressure. Then, this model was validated against experiments from a constant volume chamber and a rapid compression and expansion machine with CH4-H2 blends at different equivalent ratios. Results showed that the proposed model can provide a good prediction in stationary and turbulent fields with the calibrated model coefficient. The overall jet penetration exhibits a t0.5 dependence due to its single-phase characteristic and the relative lower density compared to ambient gas in MC. The flame propagation speed and heat release in PC influence the combustion completion degree at the start of jet ejection, the mass fraction of burned gas in jet increases with the equivalent ratio. Jet penetration is primarily driven by ejection pressure, with tip dynamics barely affected by the pressure difference after the peak. Tip penetration intensity increases with increased fuel equivalent ratio and H2 addition, owing to the faster flame propagation. These findings can offer useful suggestions for model-based design and combustion model development for gas engines.

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副室式点火システムの点火・燃焼に及ぼす水素添加の影響に関する研究

OMAE,

EN,

SHIMADA

et al. 2023

Transactions of the JSME (In Japanese)

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The gas engine for the cogeneration system realizes lean combustion by using prechamber ignition. The fuel properties of natural gas are quantified as methane value, and a small amount of H2 and C2-C4 hydrocarbon fuels affect ignition and combustion. Since the reaction rate of hydrogen fuel is known to be faster than that of hydrocarbon fuel, even a small amount of hydrogen fuel can have an effect on combustion. Therefore, in this study, experiments were conducted with hydrogen added to methane using RCEM, which is an experimental apparatus similar to a real machine, to compare the ignition and combustion properties for each amount of hydrogen added. As a result, it was found that the ignition delay time can be predicted by a zerodimensional calculation, and the jet velocity can be predicted by a one-dimensional calculation, which can be an important finding for the guideline of prechamber design.

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Effect of fuel property on the ignition and combustion characteristics of prechamber ignition

Cited by 3 publications

References 22 publications

Application study on plasma ignition in aeroengine strut–cavity–injector integrated afterburner

Application study on plasma ignition in aeroengine strut–cavity–injector integrated afterburner

Modeling and Experimental Validation of Prechamber Jet Penetration Considering Jet Density and Ejection Pressure Variations

副室式点火システムの点火・燃焼に及ぼす水素添加の影響に関する研究

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