喷嘴孔数及其布置对汽油直喷喷嘴闪沸喷雾-环境气体相互作用影响的研究

发布时间：2018-04-09 05:03

  本文选题：燃油喷雾　切入点：燃油雾化　出处：《车用发动机》2016年03期

【摘要】：为了区分火花塞点火式缸内直喷(SIDI)发动机喷雾和环境气体两相流场,将优化后的高速双色PIV(Particle Image Velocimetry)技术应用于多孔直喷喷油器的喷雾和环境气体速度的测试。此双色PIV系统由一个特殊的示踪和滤波系统组成,可同时对燃油喷雾及其环境气体的速度场进行测量。本研究采用该双色PIV方法研究不同环境压力和燃油温度的条件下,喷嘴孔数及其布置情况对燃油喷雾和环境气体的相互作用的影响。在此研究中,对3个汽油直喷喷嘴做了详细的研究,包括1个6孔喷嘴,1个3孔喷嘴及1个2孔喷嘴。研究结果表明,随着燃油温度的提高或者环境气体压力的降低,喷雾雾化增强,燃油颗粒粒径减小,导致喷雾油束变宽,喷雾与环境气体接触面积变大,喷雾和环境气体的两相流场的作用变强。不同孔数和布置的喷油器在冷态及闪沸条件下油束间干扰作用的强度不同,导致喷雾传递给环境气体的动能不同。较强的油束间的干扰作用加强了燃油喷雾与环境气体之间的动量交换过程,进而增强了环境气体的动能。
[Abstract]:In order to distinguish the spray and ambient gas two-phase flow fields of spark plug ignited cylinder direct injection (sidi) engine, the optimized two-color PIV(Particle Image Velocimetric technique was applied to the spray of porous direct injector and the measurement of ambient gas velocity.The two-color PIV system is composed of a special tracer and filter system, which can simultaneously measure the velocity field of fuel spray and its ambient gas.In this study, the effects of nozzle number and its arrangement on the interaction between fuel spray and ambient gas under different ambient pressure and fuel temperature were studied by using the two-color PIV method.In this study, three gasoline direct injection nozzles were studied in detail, including 1 6 hole nozzle, 1 3 hole nozzle and 1 2 hole nozzle.The results show that with the increase of fuel temperature or the decrease of ambient gas pressure, the spray atomization increases, the fuel particle size decreases, and the spray fuel beam widens and the contact area between the spray and the ambient gas becomes larger.The effect of the two phase flow field of spray and ambient gas becomes stronger.The intensity of the interference between the oil bundles under the cold and flash boiling conditions is different, which leads to the difference of the kinetic energy transferred to the ambient gas by the different number of holes and the arrangement of the injector.The strong interferences between fuel jets enhance the momentum exchange process between fuel spray and ambient gases and thus enhance the kinetic energy of ambient gases.
【作者单位】： 上海交通大学机械与动力工程学院汽车电子控制技术国家工程实验室;
【基金】：国家自然科学基金(51376119/E060502)
【分类号】：TK411
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本文编号：1724947