Effect of Injection System Improvement on Performances of Small Bore Swirl Chamber Diesel Engine
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摘要: 我国小型涡流室柴油机综合性能较差,特别是排放性能和低怠速稳定性能差是内燃机行业目前急待解决的问题。以170F柴油机为样机,通过对喷油系统的优化,改善整机性能。原机存在的主要问题是ZS4S1喷油嘴针阀升程和流动截面积过大,工作时针阀不能完全打开,嘴端压力低,造成燃油雾化不良。依据柴油机循环喷油量大小,应用HYDSIM工程软件模拟喷油过程,多方案优化,新设计了喷油嘴流通特性,确定了喷油嘴头部参数,用新喷油嘴和ZS4S1喷油嘴在样机上进行了试验,柴油机标定功率燃油耗下降约13%,烟度下降达80%;最低空载稳定转速从1 700 r/min下降到950 r/min。Abstract: The performance of small bore swirl chamber diesel engine in China is not well, especially the emissionand the stability at low idling speed which become the pressing issue in internal combustion factories. Presently thevital problem lays that the oversize of needle lift and flow area of the ZS4S1 nozzle make the needle cannot open up,which leads to the low injection pressure and poor performance of fuel oil atomization. Taking 170F diesel enginefor example, the fuel injection system of the prototype is optimized in this study to improve the engine overallperformances. According the fuel quantity of per-cycle, this paper uses HYDSIM software to simulate the injectionprocess with different plans, and designs new characteristics of fuel flow and new nozzle. The experiments of newnozzle and ZS4S1 nozzle in prototype show that: in rated power, the fuel consumption rate has decreased nearly13%, the smoke has dropped 80%; the idling speed has declined to 950 r/min from 1 700 r/min.
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Key words:
- atomization /
- computer simulation /
- injection pressure /
- nozzles /
- small bore diesel engine
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