摘要
通过试验研究在背压和喷射压力变化的情况下,共轨系统中喷油器喷孔直径不同时二甲醚的喷雾特性。试验采用喷油器喷孔直径分别为0.170 mm和0.250 mm,背压分别为2.5 MPa和5.0 MPa,喷射压力变化范围为35~70 MPa,变化幅度为5 MPa,测试喷油量和喷雾特性,分析6孔喷油器的喷雾形状、贯穿长度和喷雾锥角。研究表明,增大喷孔直径后的喷油器与原喷油器相比,二甲醚喷射量约增加10%~20%,且增加量随喷射压力增大而增大。2种喷油器喷雾形状均对称,增大喷孔直径后的喷油器喷雾贯穿长度变短、喷雾锥角增大。
Spray characteristics of dimethyl ether is studied in the changes of back pressure and spray pressure and also different nozzle diameters of the common rail system through the test. In the experiment, the fuel injection quantity and spray characteristics are tested by using the 0. 170 mm and 0. 250 mm nozzle diameters, 2. 5 MPa and 5.0 MPa back pressures and the injection pressures ranging from 35 MPa to 70 MPa respectively and the spray characteristics of 6-hole nozzle are analyzed. The analysis shows that compared the converted injector with the common one, the injection volume of dimethyl ether increases to 10%-20% of diesel oil and that the injection volume is increasing as the injection pressures increasing. The spray form of the two injectors is symmetrical, the length of spray penetration becomes short and the spray angle becomes large after the nozzle diameter is big.
出处
《山东交通学院学报》
CAS
2015年第1期10-14,共5页
Journal of Shandong Jiaotong University
基金
菏泽学院科研基金项目(XY12KJ05)
关键词
背压
二甲醚
喷雾锥角
喷雾贯穿长度
back pressure
dimethyl ether
spray angle
spray penetration length
