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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >EFFECT OF SWIRL RATIO AND INJECTION PRESSURE ON AUTOIGNITION, COMBUSTION AND EMISSIONS IN A HIGH SPEED DIRECT INJECTION DIESEL ENGINE FUELLED WITH BIODIESEL (B-20)
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EFFECT OF SWIRL RATIO AND INJECTION PRESSURE ON AUTOIGNITION, COMBUSTION AND EMISSIONS IN A HIGH SPEED DIRECT INJECTION DIESEL ENGINE FUELLED WITH BIODIESEL (B-20)

机译：旋流比和注射压力对掺有生物柴油（B-20）的高速直接注射柴油机自燃，燃烧和排放的影响

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摘要

Biodiesel has different physical and chemical properties than ultra low sulfur diesel fuel (ULSD). The low volatility of biodiesel is expected to affect the physical processes, mainly fuel evaporation and combustible mixture formation. The higher cetane number of biodiesel is expected to affect the rates of the chemical reactions. The combination of these two fuel properties has an impact on the auto ignition process, subsequently combustion and engine out emissions. Applying different swirl ratios and injection pressures affect both the physical and chemical processes. The focus of this paper is to investigate the effect of varying the swirl ratio and injection pressure in a single-cylinder research diesel engine using a blend of biodiesel and ULSD fuel. The engine is a High Speed Direct Injection (HSDI) equipped with a common rail injection system, EGR system and a swirl control mechanism. The engine is operated under simulated turbocharged conditions with 3 bar Indicated Mean Effective Pressure (IMEP) at 1500 rpm, using 100% ULSD and a blend of 20% biodiesel and 80% ULSD fuel. The biodiesel is developed from soy bean oil. A detailed analysis of the apparent rate of heat release (ARHR) is made to determine the role of the biodiesel component of B-20 in the combustible mixture formation, autoignition process, premixed, mixing controlled and diffusion controlled combustion fractions. The results explain the factors that cause an increase or a drop in NO_x emissions reported in the literature when using biodiesel.
机译：生物柴油与超低硫柴油（ULSD）具有不同的物理和化学特性。预计生物柴油的低挥发性会影响物理过程，主要是燃料蒸发和可燃混合物的形成。十六烷值较高的生物柴油有望影响化学反应的速率。这两种燃料特性的结合会对自动点火过程，随后的燃烧和发动机熄火排放产生影响。施加不同的涡流比和喷射压力会影响物理和化学过程。本文的重点是研究使用生物柴油和ULSD燃料混合的单缸研究型柴油发动机中改变涡流比和喷射压力的影响。该发动机是高速直接喷射（HSDI），配备有共轨喷射系统，EGR系统和涡流控制机构。该发动机在模拟涡轮增压条件下运行，使用100％ULSD以及20％生物柴油和80％ULSD燃料的混合物，在1500 rpm下具有3 bar指示平均有效压力（IMEP）。生物柴油是从大豆油中开发出来的。对表观放热速率（ARHR）进行了详细分析，以确定B-20中生物柴油组分在可燃混合物形成，自燃过程，预混合，混合控制和扩散控制的燃烧分数中的作用。结果解释了使用生物柴油时文献报道的导致NO_x排放增加或减少的因素。

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