摘要
目的研究平台环境差异对喷雾液滴粒径造成的影响。方法分别在喷嘴测试台、直流吸气式风洞、闭口回流式结冰风洞等3种测试平台上开展喷雾液滴粒径测量,并将测量结果进行对比分析。结果各平台喷雾d_(MVD)随水气压变化的规律性都较好,d_(MVD)随着水压的增大而增大,随着气压的增大而减小。对于d_(MVD)≤30μm的工况,3种测试平台的d_(MVD)测量结果接近,但粒径分布存在差异。对于d_(MVD)>30μm的工况,直流吸气式风洞和闭口回流式结冰风洞喷雾的d_(MVD)都比喷嘴测试台大,粒径分布向大颗粒方向偏移。结论气流温度、速度、环境湿度、湍流度以及平台构型等环境因素均对喷雾液滴粒径产生影响,多因素耦合作用使得闭口回流式结冰风洞液滴的蒸发、碰撞合并、破碎等行为都更强烈,从而造成了其与喷嘴测试台、直流吸气式风洞喷雾的粒径特性存在差异。
Since the movement and heat and mass transfer of water droplets are affected by the environment easily,the spray droplet size characteristics of various test platforms are different.In this paper,the effects of the environmental differences on spray droplet size are studied in experiments.The droplet size measurements were carried out on three test platforms of the nozzle test bench,open-circuit wind tunnel,and closed-circuit icing wind tunnel.Then the measurement results were compared and analyzed.The results show that the variation regularity of the spray d_(MVD) with the pressure is obvious in each platform,that is,the d_(MVD) increase with the increase of water pressure,and decrease with the increase of air pressure.For the working condi-tion of d_(MVD)≤30μm,the d_(MVD) measurement results of three test platforms are close,while the size distributions are different.For the working condition of d_(MVD)>30μm,the d_(MVD) of spray in the open-circuit wind tunnel and closed-circuit icing wind tun-nel are larger than those of the nozzle test bench,and the size distributions shift in the direction of large particles.Environmental factors such as airflow temperature,velocity,ambient humidity,turbulence and platform configuration all have a certain influ-ence on the spray droplet size.Under multi-factor coupling action,the evaporation,breakup,collision and coalescence of drop-lets in the icing wind tunnel are more intense,which causes differences in spray droplet size characteristics among test plat-forms.
作者
陈舒越
郭向东
陈晨
刘森云
赖庆仁
CHEN Shu-yue;GUO Xiang-dong;CHEN Chen;LIU Sen-yun;LAI Qing-ren(Key Laboratory of Icing and Anti/De-icing,China Aerodynamics Research and Development Center,Sichuan Mianyang 621000,China)
出处
《装备环境工程》
CAS
2022年第6期59-67,共9页
Equipment Environmental Engineering
基金
国家自然科学基金(12002364)。
关键词
喷雾
粒径分布
传热传质
结冰风洞
中值体积直径
spray
size distribution
heat and mass transfer
icing wind tunnel
medium volume diameter
