一、前言DML61型柴油机系日本国营铁道用内燃机车的主要牵引动力,对于它的一般性能和热负荷,已进行了许多试验研究。但是对于气缸内的燃烧过程,例如在燃烧过程中的放热情况、从喷油到着火的延迟时间、压力升高率,放热的状态和热效率的关系是不清楚的,这是因为没有得到适合的在高温高速下正确地测定压力值的示功图的缘故。最近已有比较精密的高速机用的示功器,可利用它来测定柴油机的 I. Introduction DML61 diesel engine is the main traction power for Japanese state-of-the-art diesel locomotives and many experimental studies have been conducted on its general performance and thermal load. However, the relationship between the combustion process in the cylinder, for example, the exotherm in the combustion process, the delay time from fuel injection to ignition, the pressure increase rate, the exothermic condition and the thermal efficiency is unclear because the A suitable thermogram to properly measure pressure at high temperature and high speed. Recently there has been more sophisticated high-speed machine dynamometer, which can be used to determine the diesel engine