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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >ANALYSIS OF THROTTLE OPENING VARIATION IMPACT ON A DIESEL ENGINE PERFORMANCE USING SECOND LAW OF THERMODYNAMICS
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ANALYSIS OF THROTTLE OPENING VARIATION IMPACT ON A DIESEL ENGINE PERFORMANCE USING SECOND LAW OF THERMODYNAMICS

机译：用第二热力学定律分析节气门开度变化对柴油机性能的影响

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摘要

The fuel efficiency of a modern diesel engine has decreased due to the recent revisions to emission standards. For an engine fuel economy, the engine speed is to be optimum for an exact throttle opening (TO) position. This work presents an analysis of throttle opening variation impact on a multi-cylinder, direct injection diesel engine with the aid of Second Law of thermodynamics. For this purpose, the engine is run for different throttle openings with several load and speed variations. At a steady engine loading condition, variation in the throttle openings has resulted in different engine speeds. The Second Law analysis, also called 'Exergy' analysis, is performed for these different engine speeds at their throttle positions. The Second Law analysis includes brake work, coolant heat transfer, exhaust losses, exergy efficiency, and air-fuel ratio. The availability analysis is performed for 70%, 80%, and 90% loads of engine maximum power condition with 50%, 75%, and 100% TO variations. The data are recorded using a computerized engine test unit. Results indicate that the optimum engine operating conditions for 70%, 80% and 90% engine loads are 2000 rpm at 50% TO, 2300 rpm at 75% TO and 3250 rpm at 100% TO respectively.
机译：由于最近对排放标准的修订，现代柴油机的燃油效率有所下降。对于发动机燃油经济性，发动机转速应在节气门开度（TO）准确的位置上达到最佳。这项工作借助热力学第二定律分析了节气门开度变化对多缸直喷柴油机的影响。为此，发动机在具有不同负载和速度变化的不同节气门开度下运行。在稳定的发动机负载条件下，节气门开度的变化导致了不同的发动机转速。针对这些不同的发动机转速在其节气门位置执行了第二定律分析，也称为“火用”分析。第二定律分析包括制动功，冷却液传热，排气损失，火用效率和空燃比。针对70％，80％和90％的发动机最大功率工况负载进行了可用性分析，TO变化分别为50％，75％和100％。使用计算机化的发动机测试单元记录数据。结果表明，对于70％，80％和90％的发动机负载，最佳发动机工况分别是50％TO时2000 rpm，75％TO时2300 rpm和100％TO时3250 rpm。

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