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首页> 外文期刊>International journal of green energy >A low pressure direct gas injection system for a four stroke LPG: Diesel dual fuel engine
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A low pressure direct gas injection system for a four stroke LPG: Diesel dual fuel engine

机译：用于四冲程LPG的低压直接气体喷射系统：柴油双燃料发动机

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Internal combustion engines running on gaseous fuels produce low torque because the inducted gaseous fuel displaces air and reduces the volumetric efficiency. This can be overcome by injecting the gaseous fuel directly into the cylinder after the intake of air is completed. This work is a step in developing and demonstrating a cost effective system, as such systems are not readily available for small applications. A low-pressure gas injector was mounted on the cylinder barrel of a fully instrumented dual fuel engine. Its location is such that the injector will be exposed to the cylinder gases about 65.5 degrees before bottom dead center, where the cylinder pressure and temperature will be relatively low. An electronic controller was also developed to time the injection process to occur after the intake valve closes and also to control the duration of injection (quantity). Experiments were conducted with LPG (Liquefied petroleum gas) as the primary fuel that was injected with this new system and diesel as the pilot fuel at the rated speed of 1500 rpm with different amounts of LPG at 80% and 100% load. Comparisons of performance, combustion and emissions with the conventional manifold injection of LPG were done. The system allowed greater amounts of LPG to be used without knock as compared to manifold injection. On the whole the developed system has potential for application in small dual fuel and spark ignited gas engines and can be taken up for further optimization.
机译：依靠气体燃料运行的内燃机产生低扭矩，因为引入的气体燃料会置换空气并降低容积效率。这可以通过在进气完成后将气态燃料直接喷射到气缸中来克服。这项工作是开发和演示具有成本效益的系统的一步，因为此类系统不适用于小型应用程序。低压气体喷射器安装在功能齐全的双燃料发动机的气缸上。其位置应使喷油器在下止点之前约65.5度暴露于气缸气体中，在该位置下气缸压力和温度将相对较低。还开发了一个电子控制器，以定时在进气门关闭后进行喷射过程，并控制喷射持续时间（数量）。实验是使用LPG（液化石油气）作为主要燃料并注入该新系统，以柴油作为引燃燃料，以1500 rpm的额定速度进行的，在80％和100％的负载下使用不同量的LPG。与传统的LPG歧管喷射进行了性能，燃烧和排放的比较。与歧管注入相比，该系统允许使用更多量的LPG而不会爆震。总体而言，已开发的系统具有在小型双燃料和火花点火式燃气发动机中应用的潜力，并可用于进一步优化。

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