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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >ACTIVE AIR CONTROL SYSTEM TO REDUCE TWO-STROKE CYCLE ENGINE POLLUTANT EMISSIONS: VALIDATION AND LABORATORY TESTING
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ACTIVE AIR CONTROL SYSTEM TO REDUCE TWO-STROKE CYCLE ENGINE POLLUTANT EMISSIONS: VALIDATION AND LABORATORY TESTING

机译：减少两冲程发动机污染排放的主动空气控制系统：验证和实验室测试

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This paper presents results from Phase 2 of the development of an Active Air Control (AAC) system to balance air flow into each cylinder of a turbocharged engine system, a PRCI-funded emissions reduction project. Imbalance in air flow creates a discontinuity in trapped equivalence ratio from cylinder to cylinder. Trapped equivalence ratio is directly proportional to NO_x production and a function of the fuel flow rate, air flow rate, and, in a two-stroke cycle engine, the scavenging efficiency. Only when these three characteristics are balanced cylinder to cylinder will the combustion and the NO_x production in each cylinder be equal. The engine NO_x production will be disproportionately high if even one cylinder operates less lean relative to the other cylinders.rnThis paper reports on the testing of an AAC system on a two-cylinder air flow bench at the National Gas Machinery Laboratory at Kansas State University. The results from these tests were then used to further validate the comprehensive, variable geometry, multi-cylinder flow model referred to as the Charge Air Integrated Manifold Engine Numerical Simulation (CAIMENS). CAIMENS is a manifold flow model coupled with the T-RECS engine processor that uses an integrated set of fundamental principles to determine the crank angle-resolved pressure, temperature, burned and unburned mass fractions, and gas exchange rates for the cylinder. CAIMENS has been validated with data from the NGML multi-cylinder flow bench.rnThis information has allowed the research team torn(1) quantify the impact of air flow imbalance andrn(2) provide detailed information leading to the specification of the active air flow control system. The end point of this project is an AAC system that can, with some engineering effort, be applied to field engines.
机译：本文介绍了主动空气控制（AAC）系统开发的第二阶段的结果，该系统用于平衡流入涡轮增压发动机系统每个气缸的气流，这是PRCI资助的减排项目。气流的不平衡会导致气缸之间的等效当量比不连续。捕集的当量比与NO_x的产生成正比，并且与燃料流量，空气流量以及在二冲程循环发动机中的清除效率成正比。只有当这三个特性在汽缸之间达到平衡时，每个汽缸的燃烧量和NO_x产量才相等。如果一个汽缸比其他汽缸更不稀薄，则发动机NO_x的产量就会成比例地增加。rn本文报道了在堪萨斯州立大学国家燃气机械实验室的两缸气流工作台上对AAC系统进行的测试。这些测试的结果随后被用于进一步验证被称为增压空气集成歧管发动机数值模拟（CAIMENS）的综合，可变几何形状，多缸流动模型。 CAIMENS是与T-RECS发动机处理器配合使用的歧管流模型，它使用一组集成的基本原理来确定曲轴角分辨的压力，温度，已燃烧和未燃烧的质量分数以及气缸的气体交换率。 CAIMENS已通过NGML多缸流动台上的数据进行了验证.rn该信息使研究团队能够撕裂（1）量化气流不平衡的影响，并且rn（2）提供详细信息以制定主动气流控制的规格系统。该项目的终点是一个AAC系统，可以通过一些工程工作将其应用于现场引擎。

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