吴威龙,陈泓,杜家坤,等.氢气缸内直喷发动机燃烧优化及热效率提升研究[J].内燃机工程,2023,44(2):1-7.
氢气缸内直喷发动机燃烧优化及热效率提升研究
Research on Combustion Optimization and Thermal Efficiency Improvement of A Hydrogen In-Cylinder Direct Injection Engine
DOI：10.13949/j.cnki.nrjgc.2023.02.001
关键词:氢气直喷发动机  燃烧  热效率  喷射相位
Key Words:hydrogen direct injection engine  combustion  thermal efficiency  injection phase
基金项目:
作者单位E-mail
吴威龙* 广州汽车集团股份有限公司汽车工程研究院，广州 511434 wuweilong@gacrnd.com 
陈泓 广州汽车集团股份有限公司汽车工程研究院，广州 511434  
杜家坤* 广州汽车集团股份有限公司汽车工程研究院，广州 511434 dujiakun@gacrnd.com 
李钰怀 广州汽车集团股份有限公司汽车工程研究院，广州 511434  
吴广权 广州汽车集团股份有限公司汽车工程研究院，广州 511434  
江枭枭 广州汽车集团股份有限公司汽车工程研究院，广州 511434  
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摘要:基于一台1.5 L氢气缸内直喷发动机，通过试验研究了氢气燃料的燃烧特性，分析了深度增压和喷氢时刻对燃烧及热效率的影响。研究表明：稀燃模式下，随着过量空气系数增加，缸内最高燃烧压力越来越高且对应曲轴转角提前，放热率峰值逐渐下降同时放热始点提前，放热时长变长，缸内燃烧温度和压升率下降。深度增压后，有效热效率可提升3%。靠近上止点喷射时，缸内喷射背压增加，喷射流量减小，提前喷射容易出现早燃，优化喷射策略后的有效热效率达43.5%。
Abstract:Based on a 1.5 L hydrogen in-cylinder direct injection engine， the combustion characteristics of hydrogen fuel was studied through experiments. The effects of deep supercharge and hydrogen injection timing on combustion and thermal efficiency were analyzed. Results show that as the excess air coefficient increases in lean-burn mode， the max pressure in-cylinder gets higher and the corresponding crankshaft angle is advanced. The peak heat release rate gradually decreases， and the start point of heat release is advanced and the duration of heat release becomes longer. The combustion temperature and pressure rise rate decreases. After the cylinder is deeply supercharged， the effective thermal efficiency can increase by 3%. When the injection angle is close to top dead center， the injection back pressure in cylinder increases， and the injection flow decreases. The pre- ignition tends to occur when the injection time is advanced. After the injection strategy is optimized， the effective thermal efficiency can reach 43.5%.
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