新型低速机喷嘴结构改进研究

Improvement on the Nozzle Structure of a New Type of Low Speed Engine

针对某新型低速机喷油器,基于Fluent软件对喷嘴内部的气液两相流场进行仿真分析,研究了倒圆半径对喷嘴流量系数和流体空穴特性的影响。在此基础上对原结构进行改进设计。对比分析表明:随倒圆半径增大,改进结构四个出口的流量系数一致性较好;且各倒圆半径下流量系数均高于原始结构。表明:结构改进是合理的。

Simulation analysis was carried out on the injectors of a new type of low speed engine with Fluent to study the gas-liquid two-phase flow in the nozzles, and the influence of fillet radius on the nozzle flow coefficients and cavitation characteristics was studied. Improvement design was conducted on the original structure based on the analysis results. Comparative analysis show that with the increase of fillet radius, the flow coefficients of the four outlets achieves better consistency after improvement, and all the flow coefficients of each fillet radius are higher than the original structure, which means this structure improvement is reasonable.