压缩天然气发动机可调增压中冷系统研究

Variable nozzle turbine (VNT) and inlet air intercooling technology was used in a multi-point injection natural gas engine. Turbocharging system parameters were determined through thermodynamic calculation and engine cycle simulation. The match of turbocharging.system and engine was suitable. Test results showed that the engine has a 15 percent increase in maximum torque, lower engine speed at maximum torque point and same rated power output,.compared to gasoline engine with the same displacement. The natural gas engine with VNT system has a 30 percent increase in maximum torque, 40 percent increase in rated power output and a 3 percent benefit of best fuel economy, compared to natural aspiration gas engine.

天然气发动机由于其容积效率降低，导致其功率密度减小。而增压技术是解决该问题的最有力的措施之一。本课题将根据天然气发动机的特点，将先进的增压技术如变截面涡轮和增压中冷等技术，应用在天然气发动机上，深入研究其燃烧特征，以期待在天然气发动机的关键技术上，取得突破性进展。