柴油机电控组合泵系统喷油特性分析  

Experimental Analysis on the Fuel Injection Characteristic of Electronically Controlled Assembly Pump System of Diesel Engine

作　　者：程涛[1] 李琦[1] 朱钰[1] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021

出　　处：《集美大学学报（自然科学版）》2015年第1期53-59,共7页Journal of Jimei University：Natural Science

基　　金：福建省自然科学基金资助项目(2012J01230)

摘　　要：针对某中速柴油机燃油系统电控化改造,采用IFR600喷油规律测量仪,研究了喷孔直径、高压油管尺寸、泵出口节流、喷射背压和喷油器针阀开启压力对喷油规律、喷油量、循环喷油量波动及喷射延迟的影响.结果表明:采用0.26 mm喷孔直径时,喷油规律较好、喷射压力高,循环喷油量的波动小;采用新高压油管、有泵出口节流和高针阀开启压力时,喷油速率和喷油量均减小,但泵出口节流引起喷油量下降较大,且喷射压力下降,不宜采用;喷射背压增大会引起喷油速率减小,实际喷油规律与测量得到的喷油规律不同;泵出口节流和高压油管尺寸对循环喷油量波动的影响显著;各因素对喷射延迟均有影响,但开始喷射延迟的变化小于结束喷射延迟.试验分析结果为该柴油机电控燃油系统的结构参数优化提供相关的理论依据.In observation of equipping a medium speed diesel engine with an electronic control on its fuel system,the influence of sizes of nozzle and high-pressure oil tube dimensions,throttling from pump outlet,injection back pressure as well as injector valve open pressure were analyzed in terms of the fuel injection law,injection amount,quantity,the fluctuation of injection amount and the injection delay by using IFR600 fuel injection flow measurement device. It showed that injecting through a nozzle in diameter 0. 26 mm resulted in a better fuel injection characteristic and a weaker fluctuation of injection amount due to a higher injection pressure,the lower injection rate and fuel injection quantity were obtained with the new high-pressure oil tube,the pump outlet throttling and the high injector valve open pressure. It was not appropriate to be with the pump outlet throttling because the injection quantity and pressure decreased too much; the actual fuel injection law and the law obtained by the measurement device were different because the injection rate decreased along with the increase of the injection back pressure; the two factors of pump outlet throttling and high-pressure oil tube dimensions had remarkable effects on the fluctuation of cycle fuel injection quantity; all factors can affect the injection delay,and the variation of the opening delay is smaller than that of the closing delay.The results of the experiment analysis provide the relevant foundation for the matching test of the electronic control fuel system for the diesel engine on optimization of structural parameters.

关 键 词：中速柴油机 电控组合泵 喷油规律 循环喷油量 喷射延迟 

分 类 号：TK421.42[动力工程及工程热物理—动力机械及工程]