【摘 要】
：
Because of the significant effect of diesel nozzle orifice geometry on the spray characteristics,an experimental investigation of the spray penetration,cone angle and droplet size distribution is cond
【机 构】
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School of Automotive Studies,Tongji University,China
【出 处】
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13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Because of the significant effect of diesel nozzle orifice geometry on the spray characteristics,an experimental investigation of the spray penetration,cone angle and droplet size distribution is conducted with two single-hole nozzles under non-evaporative conditions.Based on the synchrotron X-ray micro-tomography method,the high-precision internal structural 3-D digital models of these two nozzles are established.Measuring results show that the orifice geometric parameters of these nozzles are almost all the same except the degrees of orifice conicity.Then,the diesel spray developing processes in different injection conditions are recorded with high-speed photography device and the droplet size distribution is obtained based on the Malvern Spraytec instrument.The differences of spay developing behavior and fuel atomization between these two nozzles are observed and analyzed.Results show that,compared with the nozzle with a much bigger conicity degree,the other nozzle tends to generate a plump spray with shorter penetration,bigger cone angle and smaller fuel particle size within the same injection condition.It implies that k coefficient being negative or smaller is better for spray atomization.This phenomenon is owing to the stronger cavitation of internal fuel flow caused by the smaller orifice conicity,which introduces intensive disturbance resulting in the intensive radial diffusion and atomization of fuel spray.
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