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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Laser-induced multi-point ignition with a single-shot laser using two conical cavities for hydrogen/air mixture
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Laser-induced multi-point ignition with a single-shot laser using two conical cavities for hydrogen/air mixture

机译：激光诱导的多点点火，采用单脉冲激光器，使用两个锥形腔进行氢气/空气混合物的燃烧

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摘要

A multi-point ignition technique with a single-shot laser is proposed and its feasibility has been tested experimentally in a constant volume chamber filled with premixed hydrogen/air mixture. Two conical cavities are installed on combustion chamber walls, which are aligned with laser. The first cavity has an opening near the apex. By directing unfocused laser beam into the first cavity, part of the incident laser energy passes through the opening and irradiates into the second cavity. Simultaneous two-point ignition is achieved at each cavity, A simultaneous three-point ignition technique is based on directing focused laser beam into the two-cavity arrangement, which produces additional ignition at the center of the chamber through laser-induced spark ignition. Advantages of the proposed techniques over single-point ignition techniques are demonstrated through significant reduction in total combustion time. Shadowgraphs of the early stage of combustion process show that hot gaseous jets are ejected from the cavities, resulting in rapid combustion. It is also found that increase in incident laser energy accelerates jet ejection from the cavities. (C) 2003 Elsevier Science Inc. All rights reserved. [References: 12]
机译：提出了一种采用单脉冲激光的多点点火技术，并在充满氢气/空气预混合气体的恒定容积室内通过实验测试了其可行性。在燃烧室壁上安装了两个锥形腔，它们与激光对准。第一腔在顶点附近具有开口。通过将未聚焦的激光束引导到第一腔中，部分入射激光能量穿过开口并照射到第二腔中。每个腔室可同时进行两点点火，同时三点点火技术是基于将聚焦的激光束引导到两腔布置中，该布置通过激光诱导的火花点火在燃烧室中心产生附加点火。通过显着减少总燃烧时间，可以证明所提出的技术优于单点点火技术。燃烧过程早期的阴影图显示，热的气体喷射流从型腔中喷出，导致快速燃烧。还发现入射激光能量的增加加速了从腔室的射流喷射。 （C）2003 Elsevier Science Inc.保留所有权利。 [参考：12]

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