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涡轮增压柴油机的燃烧和排放性能在很大程度上受进气管增压空气参数(诸如进气总管空气压力和温度)的影响。为更深入地了解两种进气变量之间的关系及其对增压柴油机缸内燃烧和输出性能(包括燃油效率和排放)的影响,进行了分析和试验研究,本文概述其研究结果。了解和描述了进气总管状态对缸内燃烧性能参数的影响。研究指出,进气总管空气压力和温度是紧密相关的,与部分负荷工况或自然吸气柴油机相比,增压柴油机高负荷工况下两者有更强的依赖关系增压柴油机全负荷下进气总管空气温度改变时,总管空气压力亦随之变化,并且因此增压空气密度、柴油机效率和CO以及排烟都将发生变化,而NOx的变化相对来说更为明显。只改变进气总管空气压力,则性能和排放在部分负荷下的变化情况不同于全负荷。在进气总管温度保持不变的情况下,得出了进气总管空气压力随柴油机进口空气温度(即环境温度)的简单的变化关系式。还通过试验对进气总管空气变量对柴油机燃烧及其性能和排放的总的影响进行了研究。分析得出的预测值与试验值非常吻合。
The combustion and emissions performance of turbocharged diesel engines is greatly influenced by the intake manifold charge air parameters, such as intake manifold air pressure and temperature. In order to gain a deeper understanding of the relationship between the two intake variables and their effects on the in-cylinder combustion and output performance of a turbocharged diesel engine, including fuel efficiency and emissions, the analysis and experimental studies were conducted. The results of this study are summarized. Understand and describe the status of the intake manifold on the cylinder combustion performance parameters. The study points out that the air intake manifold air pressure and temperature are closely related, and partial-load condition or naturally aspirated diesel engine, the turbocharged diesel engine under high load conditions both have a stronger dependence on turbocharged diesel engine under full load As the intake manifold air temperature changes, the manifold air pressure also changes, and therefore the charge air density, the diesel engine efficiency, and the CO and exhaust emissions will all change, while the NOx changes will be relatively more pronounced. Only changing the intake manifold air pressure, the performance and emissions under partial load are different from the full load. With the temperature of the intake manifold kept unchanged, a simple change relation between the intake manifold air pressure and the inlet air temperature (ie ambient temperature) of the diesel engine was obtained. The overall impact of intake manifold air variables on diesel combustion and its performance and emissions has also been studied experimentally. The predicted values obtained from the analysis are in good agreement with the experimental values.