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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >AN EXPERIMENTAL INVESTIGATION OF COMBUSTION PROCESS OF A TURBO-CHARGED SI STOICHIOMETRIC OFF-ROAD ENGINE OPERATED ON GASEOUS FUEL
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AN EXPERIMENTAL INVESTIGATION OF COMBUSTION PROCESS OF A TURBO-CHARGED SI STOICHIOMETRIC OFF-ROAD ENGINE OPERATED ON GASEOUS FUEL

机译：燃气对涡轮增压SI化学计量比越野发动机燃烧过程的实验研究

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This paper presents the engine performance, combustion process, and exhaust emissions from of a turbocharged spark ignition (SI) WP-10 off-road engine developed to operate on gaseous fuels applicable to a wide range of the higher heating value (HHV) (900 to 1400 BTU). The HHV of the fuels was varied by blending of propane or carbon dioxide (CO2) into natural gas (NG). The developed engine was designed to operate at 1800 rpm and 175 kW. A new method of calculating the specific heat ratio of the bulk gases with the calculated bulk gas temperature and composition was proposed. The specific heat ratio calculated using this method was lower than the value derived from the conventional Log P-Log V method. The application of the specific heat ratio calculated in calculating the heat release process increased the heat release rate (HRR) and the total heat released during combustion. In addition, it also resulted in retarded phasing of CA50 and CA95 defined as the crank angle location when 50% and 95% of total energy was released. The effects of the fuel composition on engine performance, combustion process, and exhaust emissions were experimentally investigated. It achieved a brake thermal efficiency of about 32.8%. The exhaust emissions are in compliance with both EPA and CARB regulations. The addition of propane to NG increased the HRR, accelerated the combustion process, and shortened the combustion duration. This was the result of the quicker flame propagation property of propane. The HRR observed with propane blending was featured with two heat release peaks. The peak HRR observed with 1400 BTU fuel was about 10% higher than that observed with NG only operation. As expected, the blending of CO2 to NG was shown to slow down the combustion process, and retarded the combustion phasing, especially during the completion of combustion.
机译：本文介绍了涡轮增压火花点火（SI）WP-10越野发动机的发动机性能，燃烧过程和废气排放，该发动机是为使用可在各种较高热值（HHV）（900）范围内使用的气体燃料运行而开发的到1400 BTU）。通过将丙烷或二氧化碳（CO2）掺入天然气（NG）中来改变燃料的HHV。研发的发动机设计为以1800 rpm和175 kW的转速运行。提出了一种利用所计算的总气体温度和组成来计算总气体比热比的新方法。使用该方法计算出的比热比低于常规Log P-Log V方法得出的值。应用在计算散热过程中计算出的比热比可以提高散热率（HRR）和燃烧过程中释放的总热量。此外，当释放总能量的50％和95％时，它也导致CA50和CA95的定相延迟，CA50和CA95定义为曲柄角位置。实验研究了燃料成分对发动机性能，燃烧过程和废气排放的影响。它实现了约32.8％的制动热效率。废气排放符合EPA和CARB法规。向NG中添加丙烷会增加HRR，加速燃烧过程，并缩短燃烧持续时间。这是丙烷火焰传播速度更快的结果。丙烷共混观察到的HRR具有两个放热峰。用1400 BTU燃料观察到的峰值HRR比仅使用NG时观察到的峰值高出约10％。正如预期的那样，CO2与NG的混合显示出减慢了燃烧过程，并延迟了燃烧阶段，尤其是在燃烧完成期间。

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