论文部分内容阅读
一种带陶瓷镶块的无冷却直喷式柴油机方案通过了鉴定。和陶瓷涂层发动机比较,该机的燃油消耗量稍有所改善。经过有限元计算、维泊尔损坏分析、反复试验和设计改进后,一台带部分稳定氧化锆(PSZ)制的气缸盖火焰板、活塞顶镶块和气缸镶套(镶在气缸套上活塞上止点位置第一道环以上部位)的发动机成功地经过了短期运行试验。与水冷式发动机相比,其热损失减少了25%,燃油消耗量改善了5～9%。燃烧参数的分析表明,与陶瓷涂层发动机相比,其气缸内部温度更高些。直喷式柴油机燃气通过冷却水散失的热量大约占燃油能量的25%。为防止燃烧室的铸铁件和铝制件过热以及由此造成的损坏,普通柴油机必须进行冷却。减少燃气的热损失,就可改善燃油消耗量,得到更多的有效功。如果取消了柴油机的冷却系统,燃烧室的表面温度将从约149℃提高,最高达816℃。陶瓷材料被认为是能承受这样高温,用来制造无冷却柴油机燃烧室有关零部件合适的材料。无冷却柴油机用的一种设计方案是由热导率低的致密陶瓷镶块组成的,它是用压配合方法镶入发动机铸铁件内的。本文介绍直喷式高速单缸试验柴油机陶瓷镶块的设计、分析和评价。
A non-cooled direct injection diesel engine with a ceramic insert passed the qualification. Compared with the ceramic coating engine, the fuel consumption of the aircraft slightly improved. After the finite element calculation, the Weibull damage analysis, the repeated tests and the design improvement, a cylinder head flame plate with partially stabilized zirconium oxide (PSZ), a piston top insert and a cylinder liner (piston attached to the cylinder liner Top dead center position above the first ring) engine successfully passed the short-term operation test. Compared with the water-cooled engine, the heat loss is reduced by 25%, fuel consumption improved by 5 to 9%. Analysis of the combustion parameters shows that the internal cylinder temperature is higher than the ceramic coated engine. Direct injection diesel engine heat loss through the cooling water accounts for about 25% of fuel energy. Ordinary diesel engines must be cooled to prevent overheating of castings and aluminum parts in the combustion chamber and consequent damage. Reduce the heat loss of gas, can improve fuel consumption, get more effective work. If the diesel engine cooling system is canceled, the surface temperature of the combustion chamber will increase from about 149 ° C up to 816 ° C. Ceramic materials are considered suitable materials that can withstand such high temperatures and are used to make parts related to non-cooled diesel combustion chambers. One design for a non-cooled diesel engine is made of dense ceramic inserts with low thermal conductivity, which are press fit into the engine castings. This article describes the design, analysis and evaluation of direct injection high speed single cylinder test diesel engine ceramic inserts.