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低散热柴油机取消了传统的液体冷却系统,将传到冷却介质中的能量损失转换成曲轴输出功,以降低发动机的油耗。但节省的大部分冷却能量并不能直接增加输出功,而是传递到了排气之中,因而排气能量的回收成了一个现实的课题。低散热发动机燃烧温度较高,使NOx排放增加;气缸绝热只影响对流热损失的问题仍存在着争议;对流热损失的循环情况,灼热碳粒的幅射,气缸绝热引起的高温需要对润滑改进等问题都值得注意。同时必须处理好脆性陶瓷损坏的概率特性,确定采用整体陶瓷还是陶瓷涂层更适合于气缸的绝热。本文就上述方面论述了低散热发动机的发展前景和面临的课题。
Low-heat diesel engine to cancel the traditional liquid cooling system, the energy transmitted to the cooling medium into the crankshaft output power loss, to reduce engine fuel consumption. However, most of the cooling energy saved does not directly increase the output work, but is transmitted to the exhaust gas. Therefore, the recovery of exhaust gas has become a real issue. Low emission heat engine combustion temperature is higher, so that NOx emissions increase; cylinder adiabatic heat convection only affects the issue of heat loss is still controversial; convection heat loss cycle, hot carbon particles radiation, cylinder insulation needs high temperature lubrication improvements And other issues are worth noting. At the same time must deal with the probability of brittle ceramic damage probability characteristics, to determine the overall use of ceramic or ceramic coating is more suitable for cylinder insulation. This article discusses the above aspects of the development of low-heat engine prospects and issues facing.