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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >Lean-Burn Stationary Natural Gas Reciprocating Engine Operation with a Prototype Fiber Coupled Diode End Pumped Passively Q-Switched Laser Spark Plug
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Lean-Burn Stationary Natural Gas Reciprocating Engine Operation with a Prototype Fiber Coupled Diode End Pumped Passively Q-Switched Laser Spark Plug

机译：带有原型光纤耦合二极管端泵浦被动调Q开关激光火花塞的稀薄固定式天然气往复式发动机运行

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摘要

An end pumped passively Q-switched laser igniter was developed to meet the ignition system needs of large bore lean burn stationary natural gas engines. The laser spark plug used an optical fiber coupled diode pump source to axially pump a passively Q-switched Nd:YAG laser and transmit the laser pulse through a custom designed lens. The optical fiber coupled pump source permits the excitation energy to be transmitted to the spark plug at relatively low optical power, less than 250 watts. The Q-switched laser then generates as much as 8 millijoules of light in 2.5 nanoseconds which is focused through an asymmetric biconvex lens to create a laser spark from a focused intensity of approximately 225 GW/cm~2. A single cylinder engine fueled with either natural gas only or hydrogen augmented natural gas was operated with the laser spark plug for approximately 10 hours in tests spanning 4 days. The tests were conducted with fixed engine speed, fixed boost pressure, no exhaust gas recirculation, and laser spark timing advance set at maximum brake torque timing. Engine operational and emissions data were collected and analyzed.
机译：开发了一种端泵浦被动调Q开关激光点火器，以满足大口径稀薄燃烧固定式天然气发动机的点火系统需求。激光火花塞使用光纤耦合二极管泵浦源轴向泵浦无源调Q开关Nd：YAG激光器，并通过定制设计的透镜传输激光脉冲。光纤耦合泵浦源允许激发能量以相对较低的光功率（小于250瓦）传输到火花塞。然后，Q开关激光器在2.5纳秒内产生多达8毫焦耳的光，该光通过不对称的双凸透镜聚焦，以约225 GW / cm〜2的聚焦强度产生激光火花。在为期4天的测试中，仅使用天然气或氢气增强燃料的单缸发动机使用激光火花塞运行了大约10个小时。在固定的发动机转速，固定的增压压力，无废气再循环以及将激光火花正时提前设置为最大制动扭矩正时的情况下进行了测试。收集并分析了发动机的运行和排放数据。

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