一、绪言中速柴油机的高增压化以及依此提高功率的研究正在广泛进行。在这些研究中,为节能而提高热效率自不待言,而提高可靠性当然也是重要课题。同时,可以说提高可靠性的最重要措施是降低热负荷。最近,以提高柴油机的热效率为目的,通过高压比燃烧及特殊结构形状的燃烧室实现等压燃烧,并且做了利用气体扰动使喷射的燃油加速燃烧的试验。另外,关于增压系统,在谋求提高增压器效率的同时,对采用脉冲转换器或多脉冲方式的动压增压、静压增压以及二级 I. INTRODUCTION The research on the high-pressured medium-speed diesel engine and the improvement of the power is being carried out extensively. In these studies, it is not necessary to increase the thermal efficiency for energy saving, and improvement of reliability is of course an important issue. At the same time, arguably, the most important measure to increase reliability is to reduce the heat load. Recently, for the purpose of improving the thermal efficiency of diesel engines, an isobaric combustion has been achieved by using a high-pressure-ratio combustion and a combustion chamber of a special configuration, and experiments have been made to accelerate the combustion of the injected fuel by gas disturbance. In addition, with regard to the supercharging system, in order to increase the supercharger efficiency, dynamic pressure supercharging, static pressure supercharging, and secondary stage superposition using a pulse converter or multi-pulse mode,