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首页> 外文期刊>Energy Conversion & Management >Numerical investigations of combustion and emissions characteristics of a novel small scale opposed rotary piston engine fuelled with hydrogen at wide open throttle and stoichiometric conditions
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Numerical investigations of combustion and emissions characteristics of a novel small scale opposed rotary piston engine fuelled with hydrogen at wide open throttle and stoichiometric conditions

机译：新型小规模的燃烧和排放特性的数值研究，换旋转式旋转活塞发动机在宽开口节流阀和化学计量条件下燃料燃料

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摘要

Popularisations of hybrid vehicles and range extender electric vehicles promote the development of high power density and small scale internal combustion engines. Opposed rotary piston (ORP) engines characterised by compact designs, few moving parts and high power density are an ideal power source for the above mentioned vehicles. Due to the short cyclic period of the ORP engine, hydrogen fuel was applied to decrease the combustion duration. This paper investigated the in-cylinder combustion and emissions characteristics of the hydrogen fuelled ORP engine using 3D numerical simulation method at various engine speeds and full load conditions. In cylinder pressure evolutions, heat release rates, nitrogen monoxide (NO) formations, and power density were analysed to evaluate the engine performance. The results indicated that volumetric efficiency of this ORP engine was higher than 88.3% for all the given scenarios, being benefited from large area of intake ports. Peak in cylinder pressure decreased significantly with engine speeds, which was mainly resulted from low fuel mass burn fraction before top dead centre (TDC) for high engine speed conditions. As long as the combustion chambers passed TDC, combustion flame propagated from the bowls into the gaps between end faces of adjacent pistons rapidly. In the exhaust stroke, free discharge process of this ORP engine lasted longer duration than reciprocating engines, which would lead to more energy losses. NO was mainly formed after TDC, with the accumulated NO mass being in the range of 0.07 mg-0.5 mg per cycle per cylinder in the engine speed range of 1000-5000 r/min. Maximum power density and NO emissions factor of this engine fuelled with hydrogen was approximately 69.2 kW.L-1 and 10.60 g.(kW.h)(-1), respectively. Indicated thermal efficiency dropped from 36.2% to 26.5% when the engine speed increased from 1000 to 5000 r/min.
机译：混合动力汽车和范围扩展电动汽车的普及促进了高功率密度和小规模内燃机的发展。具有紧凑设计的相对的旋转活塞（ORP）发动机，少量移动部件和高功率密度是上述车辆的理想电源。由于ORP发动机的短周期短，施加氢燃料以降低燃烧持续时间。本文研究了在各种发动机速度和全负荷条件下使用3D数值模拟方法的汽油燃料ORP发动机的缸内燃烧和排放特性。在气缸压力演进中，分析了热释放速率，氮一氧化氮（NO）和功率密度，以评估发动机性能。结果表明，对于所有给定的场景，该ORP发动机的体积效率高于88.3％，从大面积的进气口中受益。气缸压力的峰值随发动机速度而显着降低，主要是由于顶部死亡中心（TDC）之前的低燃料质量燃烧级分导致高发动机速度条件。只要燃烧室通过TDC，从碗传播的燃烧火焰迅速地从碗传播到邻近活塞的端面之间的间隙中。在排气冲程中，这种ORP发动机的自由放电过程持续比往复式发动机更长的持续时间，这将导致更多的能量损失。在TDC之后没有形成，在发动机速度范围为1000-5000 r / min的发动机速度范围内，累计没有质量在0.07mg-0.5mg的范围内。最大功率密度和该发动机的排放因子与氢气燃气的该发动机约为69.2 kW.L-1和10.60g（kw.h）（ - 1）。当发动机速度从1000升至5000升/分钟时，表示热效率从36.2％降至26.5％。

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