引燃油量对柴油引燃天然气发动机燃烧特性影响.pdfVIP

学兔兔 汽 车 工 程 2015年(第37卷)第4期 Automotive Engineering 2015(Vo1．37)No．4 2015066 引燃油量对柴油引燃天然气发动机燃烧特性的影响米 刘 杰 ，张 欣 ，杨福源 ，王贺武 ，欧阳明高 (1．北京交通大学机械与电子控制工程学院，北京 100044；2．清华大学，汽车安全与节能国家重点实验室，北京 100084) [摘要] 在一台由六缸柴油机改造的柴油引燃天然气发动机上进行试验，以分析引燃柴油量对该发动机燃烧 过程的影响。结果表明：随着引燃柴油量的增加，放热率曲线由双峰逐渐过渡为单峰，发动机热效率明显提高。压 力升高率随引燃油量的增加和喷油时刻的推迟而降低，而燃烧持续期随引燃油量的增加变化不大。 关键词：柴油引燃天然气发动机；燃烧特性 Effects of Pilot Fuel Quantity on the Combustion Characteristics of a Diesel Pilot Ignition CNG Engine Liu Jie ，Zhang Xin ，Yang Fuyuan ，Wang Hewu Ouyang Minggao 1．School of Mechanical，Electronic and Control Engineering，Beijing Jiaotong University，Bering 100044 2．Tsinghua University，State Key Laboratory ofAutomotive Safety and Energy，Being 100084 [Abstract] A diesel pilot ignition CNG engine refitted from a six-cylinder diesel engine is tested to analyze the effects of pilot diesel quantity and injection timing on the combustion process of engine．The results show that with the increase of the pilot diesel quantity，the curve of heat release rate is gradually shifted from double peak to single peak with the brake thermal efficiency of engine obviously enhanced．The pressure rise rate is reduced with the increase of pilot diesel quantity and the delay of injection timing，while the combustion duration does not change much with pilot diesel quantity． Keywords：diesel pilot ignition CNG engine；combustion characteristics 料费用，同时能够降低环境污染_1 J。10年前对柴 日IJ吾 油／天然气发动机的燃烧特性进行的研究 由于 受到当时电控技术的限制，引燃柴