论文部分内容阅读
较高的涡轮增压度通常意味着较高的机械负荷和热负荷以及起动性、低负荷 工作和加速性不良,从而影响操纵性能。本文论述了风冷发动机的改进措施。估 计到予定的负荷限制,指出低压缩比对功率和比油耗的影响,以及对空燃比、增 压空气压力和温度等参数的影响。介绍了加热进气的方法,以便改善起动和部分 负荷性能,及减少碳氢排放物。为了改善操纵性能,本文考虑了一般涡轮增压的 二种变型:在“寄存器”(reqister)式涡轮增压中,采用两台或更多的较小 型的涡轮增压器并联布置来代替通常的涡轮增压布置。在“二级”涡轮增压布置中,几台涡轮增压器是串联的。这二种系统具有在宽广的速度范围内有良好的外特性和加速性的优点。
Higher turbocharging generally means higher mechanical and thermal loads as well as poor start up, low load work and poor acceleration, which can affect maneuverability. This article discusses the improvement of air-cooled engine. Estimated to a predetermined load limit, pointed out that the low compression ratio on the power and fuel consumption than the impact, as well as air-fuel ratio, charge air pressure and temperature and other parameters. The method of heating the intake air is introduced to improve starting and part load performance and to reduce hydrocarbon emissions. In order to improve maneuverability, this article considers two variants of a typical turbocharger: In a “reqister” turbocharger, two or more smaller turbochargers are arranged in parallel to replace the usual Turbocharged layout. In a “second stage” turbocharging arrangement, several turbochargers are connected in series. Both systems have the advantage of having good external characteristics and acceleration over a wide range of speeds.