超声速冷态流场液体射流雾化实验研究  

Experimental investigation of liquid jets atomization in supersonic cold crossflow

作　　者：陈亮[1] 乐嘉陵[1,2] 宋文艳[1] 杨顺华[2] 曹娜[3] 

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]中国空气动力研究与发展中心,四川绵阳621000 [3]西北核技术研究所,西安710024

出　　处：《实验流体力学》2011年第2期29-34,40,共7页Journal of Experiments in Fluid Mechanics

摘　　要：采用全息诊断和高速纹影,对不同来流总压、来流马赫数、喷孔直径和喷射压力等条件下超声速冷态流场液体射流雾化进行了研究。初步了解了超声速流场中液体射流的雾化过程和机理,得到了射流的Weber数和Oh数等雾化参数,比较了不同条件下射流穿透高度的差异,得到了液滴平均直径和数量密度的空间分布。研究表明:射流表面不稳定波的增长是超声速流场中射流破碎的主要原因;射流与气流的动量通量比和喷孔直径影响射流穿透高度,动量通量比和喷孔直径增加都会增加穿透高度;实验中液体射流的雾化过程非常迅速,在喷嘴下游20mm处,直径0.5mm的射流就破碎成平均直径10μm左右的液滴群,随着液滴向下游运动,平均直径逐渐减小,平均直径和数量密度分布逐渐均匀。Holographic diagnosis and high-speed schlieren photography were applied to study the atomization of liquid jets in supersonic crossflow under various experimental conditions,which contain the stream total pressure,the stream Mach number,the nozzle diameter and the injection pressure.The process and the theoretical principal of liquid jets atomization in the supersonic crossflow have been studied preliminary.Atomization parameters such as Weber number and Oh number have been acquired as well.The jet penetration heights under different experimental conditions and the spatial distributions of diameters and number density of the droplets have been measured.Results indicate that the instability wave growth on the surface is one of the primary factors to liquid jet breaking up in supersonic crossflow.The jet penetration height will increase if the jet-to-air momentums flux ratios or orifice diameters increase.Moreover,the study demonstrates the process of liquid jet atomization is very speedy in supersonic crossflow,i.e.,the liquid jet is broken into droplets of mean diameter 10μm at 20mm downstream the nozzle bank.As the droplets move downstream,the mean diameter decreases and distributions of mean diameters and number density become uniform gradually.

关 键 词：超声速流场 全息诊断 雾化 

分 类 号：O348.12[理学—固体力学]