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首页> 外文期刊>Energy Conversion & Management >Numerical comparison of combustion characteristics and cost between hydrogen, oxygen and their combinations addition on natural gas fueled HCCI engine
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Numerical comparison of combustion characteristics and cost between hydrogen, oxygen and their combinations addition on natural gas fueled HCCI engine

机译：天然气燃料HCCI发动机对氢，氧气及其组合的燃烧特性和成本的数值比较

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摘要

Hydrogen, oxygen, and their combinations as effective species in the production of radical OH, which plays an effective role in the HCCI combustion enhancement, are considered to study their effect on combustion characteristics and resolving the challenges facing natural gas HCCI engines numerically. There are five items were considered for adding oxygen, hydrogen and their compounds, including 1%, 2%,3%, 4% and 5% of the fuel mixture for hydrogen, 10%, 20%, 30%, 40% and 50% for the extra oxygen in oxidizer and add up half of each respectively, including 0.5% H-2 + 5%O-2, 1% H-2 + 10%O-2, 1.5% H-2 + 15%O-2, 2% H-2 + 20%O-2, and 2.5% H-2 + 25%O-2. Adding hydrogen to some extent improves the engine efficiency, lowers combustion duration, and brings the engine cycle closer to the ideal Otto cycle and reduces CO and UHC emissions, but it can only increase engine operating range by as much as 4.2% at low load, increases NO emission, and increases the combustion noise. Hydrogen addition results in faster methane combustion, shortens the fuel combustion duration and increases the OH radical concentration. Up to 30%, added oxygen can extend the engine working range up to 48% at low loads, making the engine run smoother and shortening the combustion duration, although IMEP and efficiency decrease, CO and UHC emissions increase. By using hydrogen and oxygen compounds obtained their both benefits simultaneously, the engine operating range expands by 40.19% at low loads, the emissions would be less than the Euro 6 standard limitation and the maximum difference in efficiency is only 2.38% less than hydrogen addition. By adding these additives, ignition delay decreases and SOC advances. Using hydrogen and oxygen to improve engine performance at low loads is an appropriate and affordable solution, which does not cost much.
机译：氢气，氧气及其组合作为基础·欧姆的生产中的有效物种在HCCI燃烧增强中起着有效作用，考虑研究它们对燃烧特性的影响，并解决了数值上的天然气HCCI发动机面临的挑战。用于加入氧气，氢气及其化合物，包括1％，2％，3％，4％和5％的氢气，10％，20％，30％，40％和50种氧化剂中额外氧气的含量分别增加一半，包括0.5％H-2 + 5％O-2，1％H-2 + 10％O-2，1.5％H-2 + 15％O- 2,2％H-2 + 20％O-2和2.5％H-2 + 25％O-2。在一定程度上添加氢气改善了发动机效率，降低燃烧持续时间，并将发动机循环更靠近理想的奥托循环，减少了CO和UHC排放，但它只能将发动机运行范围增加到低负荷下的4.2％，不增加发射，并增加燃烧噪声。氢添加导致更快的甲烷燃烧，缩短燃料燃烧持续时间并增加OH激进浓度。高达30％，添加的氧气可以在低负荷下延伸发动机工作范围高达48％，使发动机运行更平滑并缩短燃烧持续时间，尽管IMEP和效率降低，CO和UHC排放量增加。通过使用氢气和氧气化合物同时获得它们的两个益处，发动机运行范围在低负荷下扩大了40.19％，排放量小于欧元6个标准限制，效率的最大差异仅为氢添加量小于2.38％。通过添加这些添加剂，点火延迟降低和SOC进步。使用氢气和氧气以在低负载下提高发动机性能是合适的和实惠的解决方案，其不太成本。

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