首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >Comparison of the indicated work outputs, idle stabilities, and heat release characteristics of a direct-injection diesel engine operating cold at two compression ratios
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Comparison of the indicated work outputs, idle stabilities, and heat release characteristics of a direct-injection diesel engine operating cold at two compression ratios

机译:两种压缩比下冷运行的直喷式柴油机的指示输出功率,怠速稳定性和放热特性的比较

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摘要

A reduction in the compression ratio can adversely affect the cold-start and idling performance of diesel engines. The problems and potential solutions have been investigated. Studies have been carried out to compare the indicated performances and heat release characteristics of a direct-injection diesel engine during low-speed cold operation at compression ratios of 18.4:1 and 15.4:1. The test engine was a naturally aspirated single-cylinder design with a swept volume of 0.51. Tests covered start temperatures between 10℃ and -20℃. At around 300r/min, the indicated work output was higher at the lower compression ratio as a result of lower blow-by, and the cycle-by-cycle stabilities of the heat release and work output were similar at both compression ratios. The cycle-by-cycle stability deteriorated with increasing engine speed. At 1000 r/min idling conditions, the stability was relatively poor and was worse for the low-compression-ratio case. At the high compression ratio, the cycle-by-cycle stability was improved by introducing multiple pilot injections and using metallic glow plugs operating at about 850℃. At the low compression ratio, improvements in stability could not be achieved without switching to glow plugs operating at about 1100℃.
机译:压缩比的降低会不利地影响柴油发动机的冷启动和怠速性能。问题和潜在的解决方案已进行了调查。已经进行了研究,以比较压缩比为18.4:1和15.4:1的直喷式柴油发动机在低速冷运转期间的指示性能和放热特性。测试引擎是自然吸气单缸设计,扫气量为0.51。测试涵盖了10℃至-20℃的起始温度。在300r / min左右,由于较低的漏气,所显示的功输出在较低的压缩比下较高,并且在这两个压缩比下,放热和功输出的逐周期稳定性相似。随着发动机转速的增加,逐周期稳定性变差。在1000 r / min的怠速条件下,稳定性相对较差,而对于低压缩比情况则更差。在高压缩比下,通过引入多次引燃喷射和使用在约850℃左右运行的金属电热塞来改善逐周期稳定性。在低压缩比下,如果不切换到在1100℃左右工作的电热塞,就无法实现稳定性的提高。

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