摘要
采用混合多相流空穴模型,进行喷孔轴线与针阀轴线夹角各异的多孔喷油器喷嘴内三维气液两相流数值模拟,详细研究多孔喷油器各孔内部流动特性的差异及喷油压力和喷油背压对其影响规律。结果表明:对于喷孔轴线与针阀轴线夹角各异的多孔喷油器,相同喷射条件下,随着喷孔轴线与针阀轴线夹角的增大,喷孔内的空化效应逐渐增强,质量流量和流量系数逐渐降低;随着喷油压力的提高,各孔内的空化效应均逐渐增强,质量流量均逐渐升高,流量系数均逐渐降低;随着喷油背压的提高,各孔内的空化效应逐渐减弱,质量流量逐渐降低,但流量系数却逐渐提高。
Based on a multi-hole diesel nozzle with different nozzle hole in terms of the angle between nozzle hole axis and needle axis （ABNN）, the three-dimensional numerical simulation of gas-liquid two-phase flow was carried out by using the mixed multi-phase cavitation flow model, and not only the internal flow characteristics of each nozzle hole but also the influences of injection pressure and injection back pressure on them were analyzed in detail. The results show that with the increment of ABNN, the hole cavitation effect is enhanced gradually and the hole mass flow rate and the hole discharge coefficient are decreased little by little for the multi-hole diesel nozzle under the same injection condition; for each nozzle hole, the cavitation effect is enhanced, the mass flow rate is improved, and the discharge coefficient is decreased gradually with the increase of injection pressure ; however, with the increment of the injection back pressure, the cavitation effect is weakened, the mass flow rate is decreased, and the discharge coefficient is improved little by little for each nozzle hole.
出处
《汽车零部件》
2017年第12期42-45,共4页
Automobile Parts
关键词
多孔柴油机喷油器
流动特性
喷油压力
喷油背压
Muhi-holediesel injector
Flow characteristic
Injection pressure
Injection back pressure
