Comparison of combustion, emission and abnormal combustion of hydrogen-fueled Wankel rotary engine and reciprocating piston engine
Comparison of combustion, emission and abnormal combustion of hydrogen-fueled Wankel rotary engine and reciprocating piston engine
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DOI：
10.1016/j.fuel.2022.123675
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发表时间：
2022-02-24
期刊：
影响因子：
7.4
通讯作者：
Wang, Shuofeng
中科院分区：
文献类型：
--
作者：
Meng, Hao;Ji, Changwei;Wang, Shuofeng
氢燃料旺克尔旋转发动机(HWRE)作为一种优良的动力装置，值得深入研究。这项工作的目的是通过比较氢燃料活塞式发动机(HRPE)和氢燃料活塞发动机(HRPE)以及一些汽油燃料在燃烧、排放和异常燃烧方面的情况，来更全面地了解HWRE的优缺点以及开发氢专用WRE时应该做的事情。结果表明，与汽油和氢气燃料的RPE相比，HWRE具有更高的单位排量功率、稍低的制动热效率和极差的NO排放。在2500r/min下，HWRE的最大单位排量功率分别是氢气和汽油RPE的1.66倍和1.23倍，但最大制动热效率绝对降低了4.96%和3.06%。此外，HWREs的异常燃烧特征和机理也不同于HRPEs。特别是在HWRE中，可以通过改进火花塞孔来消除回火，而爆震问题则更加突出。总体而言，HWRE具有在未来零碳发动机中赢得一席之地的潜力，但需要在提高热效率、降低热负荷和防止爆震等方面为氢专用WRE的发展做一些工作。
Hydrogen-fueled Wankel rotary engine (HWRE) as an excellent power device deserves more in-depth study. The goal of this work is to provide a more comprehensive understanding of the pros and cons of HWRE and what should be done when developing a hydrogen-specific WRE by comparing HWRE with hydrogen-fueled recip-rocating piston engine (HRPE), as well as some gasoline-fueled conditions, in terms of combustion, emissions and abnormal combustion. The results show that HWRE can achieve higher power per displacement compared to the RPE fueled by whether gasoline or hydrogen, as well as slightly low brake thermal efficiency and extremely poor NO emission. At 2500 r/min, the maximum power per displacement of HWRE is 1.66 and 1.23 times that of hydrogen and gasoline RPE, respectively, however, accompanying absolute reductions of 4.96% and 3.06% in maximum brake thermal efficiency. In addition, the characteristics and mechanisms of abnormal combustion in HWREs are different compared to HRPEs. In particular, in HWRE, the backfire can be eliminated by the improvement of the spark plug hole, while the knock problem is more prominent. Overall, HWREs have the potential to win a place in the future of zero-carbon engines, however, some works, such as improving thermal efficiency, reducing thermal load and preventing knock, need to be done for the development of hydrogen-specific WRE.