Experimental Investigation on High-Altitude Ignition and Ignition Enhancement by Multi-Channel Plasma Igniter

Lin, Baiquan; Wu, Yun; Xu, Ming-xing; Shen, Yan-Ming

doi:10.1007/s11090-021-10189-0

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…Examples include plasma igniters, microwave-based systems, laser sources, etc. [2][3][4][5][6][7]. Laser ignition has been shown to limit the main drawbacks of spark plug ignition and presents many advantages [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Ignition of a Safran’s Helicopter Engine With a Compact Nanosecond Laser System

Maillard,

Amiard Hudebine,

Orain

et al. 2023

Volume 3B: Combustion, Fuels, and Emissions

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We report on the ignition of a Safran’s helicopter engine using a compact laser system. The laser system delivers nanosecond infrared pulses at a high repetition rate which energy can be up to 40 mJ. The first tests were run on a Safran Helicopter Engines experimental bench operating at room temperature and ambient pressure with jet A-1 fuel. We studied in detail the impact of the laser pulse energy and the spark position on the engine ignition domain. An optical focusing system fixed on the engine casing enables to focus the laser pulse at different positions in the combustion chamber. The focused laser beam generates a plasma in the combustion chamber, which ignites the engine. Our experimental data show that the laser spark position impacts the pulse energy required to ignite the engine. At the optimal position, we very reliably ignite the engine with a pulse energy of only 3 mJ. To understand this behavior, similar experiments were run on the MERCATO experimental bench at ONERA (the French aerospace lab). This bench faithfully reproduces the geometry and the flow field of the Safran engine’s combustion chamber. Using a Mie scattering imaging technique, we studied the kerosene spray generated by the start injector. Our data indicates that depending on the laser spark position in the combustion chamber, the kerosene droplets scatter more or less the laser light. This impacts the pulse energy and its spot size at the focal point and influences the laser ignition probability. In addition, ignition success requires a minimum density of kerosene droplets. Hence, the optimal laser spark position is a compromise between the droplet density at the focal point and the laser beam scattering induced by droplets before reaching that position.

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Section: Introductionmentioning

confidence: 99%

Ignition of a Safran’s Helicopter Engine With a Compact Nanosecond Laser System

Maillard,

Amiard Hudebine,

Orain

et al. 2023

Volume 3B: Combustion, Fuels, and Emissions

View full text Add to dashboard Cite

show abstract

Experimental investigation on spark ignition of multi-swirl spray flames under sub-atmospheric pressures and low temperatures

Zhao

Liu²,

Wang³

et al. 2022

Fuel

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Modeling of the spray-induced wall stress acting on the ignition assistance device

Kim,

Torelli,

Oruganti

et al. 2023

Physics of Fluids

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This research introduces a novel wall-stress model called the Spray-Induced Wall Stress (SIWS) model, which considers the effects of spray-wall impingement and the resulting formation of wall stress within the Lagrangian spray modeling framework. The primary objective of this paper is to provide a mathematical description of the fundamental physics underlying the model. Subsequently, the proposed model is validated using existing experimental data. The remainder of the study focuses on the practical application of the model to an ignition assistance device. Specifically, this device is installed in a compression ignition engine and designed to enhance ignition in aviation-fueled high-altitude aircraft propulsion systems. The research sheds light on the mechanical impulse caused by the high-speed impact of the spray jet, leading to the accumulation of mechanical stress on the rigid body of the ignition assistance device. Previous studies on fluid–structure interaction have only considered the interaction between the gas phase and the solid wall. However, the SIWS model incorporates the additional impact of the impinging liquid spray jet. Consequently, the simulated stress distribution on the ignition assistance device can be estimated by considering both the gas-phase-induced term and the spray-induced term simultaneously.

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Experimental Investigation on High-Altitude Ignition and Ignition Enhancement by Multi-Channel Plasma Igniter

Cited by 4 publications

References 39 publications

Ignition of a Safran’s Helicopter Engine With a Compact Nanosecond Laser System

Ignition of a Safran’s Helicopter Engine With a Compact Nanosecond Laser System

Experimental investigation on spark ignition of multi-swirl spray flames under sub-atmospheric pressures and low temperatures

Modeling of the spray-induced wall stress acting on the ignition assistance device

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