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本文通过对一台高比功率涡轮增压直喷式卡车柴油机的计算机模拟,预估排气道和燃烧室零件采取隔热措施的效益。将一台标准发动机与隔热发动机进行了比较,隔热发动机的排气道、缸盖、活塞和缸套,或者单独隔热,或者其中几件或全部隔热。还研究了,当通过燃烧室壁的热损失变化相当大时,对发动机工况进行重新最佳化的必要性。 发展一种降低发动机传到冷却系统的热损失的技术,而且能用于现有发动机结构且成本低、改动少,其重要性是公认的。研究了达到这些目标的可能方法,并评价了它们的效果。 本文还叙述了在排气道内安装陶瓷衬套的柴油机的成功试验,发动机的试验运转时间在1000小时以上。
In this paper, the computer simulation of a high specific-power turbocharged direct-injection truck diesel engine is used to estimate the benefits of heat insulation measures on exhaust and combustion chamber components. A standard engine is compared to a thermal insulation engine to insulate the engine exhaust, head, piston and cylinder liner, either individually, or with some or all of the insulation. It has also been studied the need to re-optimize engine operating conditions when the variation in heat loss through the walls of the combustion chamber is quite substantial. The importance of developing a technique to reduce heat loss from the engine to the cooling system and to be used with existing engine construction at low cost and with little modification is well established. The possible ways to achieve these goals were studied and their effectiveness evaluated. This paper also describes the successful test of a diesel engine equipped with a ceramic liner in the exhaust passage. The test run time of the engine is over 1000 hours.