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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >A COMPRESSION RATIO SELECTION METHOD OF THE NON-ROAD DIESEL ENGINE WITHOUT EGR SYSTEM TO MEET STAGE V EMISSION STANDARDS
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A COMPRESSION RATIO SELECTION METHOD OF THE NON-ROAD DIESEL ENGINE WITHOUT EGR SYSTEM TO MEET STAGE V EMISSION STANDARDS

机译：符合阶段V排放标准的无EGR非道路柴油机压缩比选择方法。

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Fuel efficiency is the key buying factor in the non-road diesel engine market, because the engine mainly operates in the high torque region and consumes relatively large amount of fuel in a short term. A compression ratio of diesel engine is deeply related to a thermal efficiency and it is one of the key design parameter influencing on the fuel efficiency. In this paper, the new approach to select compression ratio is described and the design constrains such as in-cylinder max allowable pressure, max allowable temperature at turbine front end and max allowable temperature at compressor back end were considered. The base engine is 3.4 liter non-road diesel engine without EGR (Exhaust Gas Recirculation) system for Stage V emission standards and is originated from the same engine system with EGR system to meet Tier 4 Final emission standards. Its official compression ratio is 17.0. The purpose of this study is to select an optimal compression ratio for non-road diesel engine system with non-EGR system to meet Stage V emission standards. The methodology to be presented in this study is based on the 1-D engine performance simulations, the 3-D CFD (Computational Fluid Dynamics) combustion simulations, and the engine bench test. In these simulations, a compression ratio and a SOI (Start of Injection) were considered for sweeping parameters. With analyzing the results of parameter studies and engine design constraints, an optimal compression ratio is found to be 18.0. As a result of many engine bench tests, a fuel consumption has been improved by 1.5% with new piston bowl of which compression ratio is 18.0, meeting Stage V emission standards.
机译：燃油效率是非公路柴油发动机市场的关键购买因素，因为发动机主要在高扭矩区域工作，并在短期内消耗相对大量的燃料。柴油发动机的压缩比与热效率深入相关，并且是影响燃料效率的关键设计参数之一。在本文中，描述了选择压缩比的新方法，并且考虑了诸如缸内最大允许压力的设计限制，涡轮前端的最大允许温度和压缩机后端的最大允许温度。基本发动机是3.4升非公路柴油发动机，没有EGR（废气再循环）系统，用于阶段V排放标准，并源自具有EGR系统的相同发动机系统，以满足Tier 4最终排放标准。其官方压缩比率为17.0。本研究的目的是为具有非EGR系统的非公路柴油发动机系统选择最佳压缩比以满足V阶段V排放标准。本研究中呈现的方法基于1-D发动机性能模拟，3-D CFD（计算流体动力学）燃烧模拟和发动机工作台测试。在这些模拟中，考虑了压缩比和SOI（注射的开始）用于扫描参数。通过分析参数研究和发动机设计约束的结果，发现最佳压缩比为18.0。由于许多发动机台阶测试，其中压缩比为18.0的新活塞碗，燃料消耗得到了1.5％的提高1.5％，阶段V发射标准。

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