预燃室点火式汽油机稀薄燃烧特性试验研究  

Experimental Study on Lean-Burn Characteristics of Gasoline Engine with Prechamber Ignition

作　　者：尹丛勃[1] 申小雨 YIN Congbo;SHEN Xiaoyu(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海200093

出　　处：《车用发动机》2024年第4期17-23,共7页Vehicle Engine

基　　金：上海市科技计划项目(21010503000)。

摘　　要：基于测试试验台架对被动预燃室增压直喷汽油机在不同工况下的效率特性、燃烧特性、燃油经济性以及排放特性进行了研究。采用3次喷射策略形成稀薄燃烧环境(过量空气系数为1.3),发动机转速为2800 r/min,2000 r/min。结果表明:同一转速条件下,增压预燃室发动机在负荷增加时,有效热效率和有效机械效率呈上升趋势,但超过一定范围,有效热效率下降;CA10,CA50,CA75,CA90和最大爆震指数随负荷增大呈上升趋势,同时燃烧循环变动率也可以控制在0.35%以下;发动机转速为2800 r/min,较小负荷时的燃油消耗率最低可达242.1 g/(kW·h);NO_(x),HC和CO排放与发动机运行工况密切相关,随负荷增加呈现减少趋势,Soot排放可控制在0.13 mg/m^(3)。A bench test was conducted on a turbocharged gasoline direct-injection engine with a passive prechamber under different operating conditions to investigate its efficiency characteristics,combustion characteristics,fuel economy and emission characteristics.The engine employed a triple-injection strategy to form a lean-burn environment of 1.3 excess air ratio at 2800 r/min and 2000 r/min.The results showed that,at the same speed,the turbocharged prechamber engine exhibited an increasing trend in effective thermal efficiency and effective mechanical efficiency with increasing load,but a decreasing trend of effective thermal efficiency beyond a certain range.CA10,CA50,CA75,CA90 and the maximum knock index showed an increasing trend with increasing load,while the combustion cyclic variation rate was also controlled below 0.35%.The lowest specific fuel consumption was 242.1 g/(kW·h)under the condition of 2800 r/min and light load.The emissions of NO_(x),HC,and CO were closely related to the engine operating conditions and showed a decreasing trend with increasing load.The particle emissions could be controlled to 0.13 mg/m^(3).

关 键 词：预燃室式燃烧室 汽油机 稀薄燃烧 燃油消耗率 排放 喷油策略 

分 类 号：TK413.2[动力工程及工程热物理—动力机械及工程]