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Numerical study of the effects of split injection strategy and swirl ratio for biodiesel PCCI combustion and emissions
Propulsion and Power Research ( IF 5.3 ) Pub Date : 2020-12-10 , DOI: 10.1016/j.jppr.2020.11.004
Alborz Zehni , Navid Balazadeh , Mojtaba Hajibabaei , Kamran Poorghasemi

New methods have been studied in the past few decades to decrease exhaust emissions and fuel consumption of diesel engines. Using new combustion methods as low-temperature combustion (LTC) strategies and also utilizing new fuels as bio-diesel are beneficial ways to overcome diesel engine issues. This numerical study focused on the effect of split injection strategies as well as swirl ratio (SR) on the biodiesel premixed charge compression ignition (PCCI) combustion process and the related emissions. In this regard, KIVA-3V code as a CFD tool has been utilized to analyze the combustion and emission characteristics of the diesel engine. Single and split injection strategies have been executed on biodiesel PCCI combustion and have been compared in order to probe and examine the injection strategies. The results show that in both strategies, advancing the injection timing can lower the combustion emission and improve the engine performance by optimizing the start of injection (SOI) as sweet spot value. Utilizing a high swirl ratio with the split injection strategy has a negative effect on overall combustion, emission, and performance in comparison with the single injection strategy. For multi-injection scheme, SOI = −35 ATDC, SR = 1.1, and for single injection scheme, SOI = −40 ATDC, SR = 1.1 are considered as optimum cases regarding minimum total exhaust emissions and highest performance.



中文翻译:

分流喷射策略和涡流比对生物柴油PCCI燃烧和排放影响的数值研究

在过去的几十年中,已经研究了减少柴油机废气排放和燃料消耗的新方法。使用新的燃烧方法作为低温燃烧(LTC)策略以及将新的燃料用作生物柴油是解决柴油发动机问题的有益方法。这项数值研究的重点是分流喷射策略以及涡流比(SR)对生物柴油预混合充量压缩点火(PCCI)燃烧过程和相关排放物的影响。在这方面,已使用KIVA-3V代码作为CFD工具来分析柴油机的燃烧和排放特性。已对生物柴油PCCI燃烧执行了单次和分段喷射策略,并已进行了比较,以探测和检查喷射策略。结果表明,在两种策略中,提前喷射正时可以通过优化喷射开始(SOI)作为最佳点值来降低燃烧排放并改善发动机性能。与单喷射策略相比,分流喷射策略使用高涡流比对整体燃烧,排放和性能有负面影响。对于多次喷射方案,SOI = −35 ATDC,SR = 1.1,对于一次喷射方案,SOI = −40 ATDC,SR = 1.1被认为是关于最小总废气排放和最高性能的最佳情况。和单次注射策略相比的性能。对于多次喷射方案,SOI = −35 ATDC,SR = 1.1,对于一次喷射方案,SOI = −40 ATDC,SR = 1.1被认为是关于最小总废气排放和最高性能的最佳情况。和单次注射策略相比的性能。对于多次喷射方案,SOI = −35 ATDC,SR = 1.1,对于一次喷射方案,SOI = −40 ATDC,SR = 1.1被认为是关于最小总废气排放和最高性能的最佳情况。

更新日期:2021-01-02
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