摘要
过冷大水滴粒径测量方法是结冰风洞过冷大水滴云雾模拟能力的关键组成部分。为评估双通道机载式相位多普勒干涉仪(PDI-FPDR)的过冷大水滴粒径测量能力,利用标准液滴流发生器产生特定尺寸的大粒径液滴流,评估PDI-FPDR的液滴粒径测量不确定度;针对真实大粒径喷雾,同时采用Malvern粒度分析仪和PDI-FPDR测量喷雾粒径特征参数,对比评估PDI-FPDR的大粒径喷雾测量能力。结果表明:PDI-FPDR小粒径通道无法准确测量大尺寸液滴,测量结果显著小于真实液滴粒径(测量粒径189.0μm的液滴,相对误差为-72.8%);大粒径通道可以较为准确地测量大尺寸液滴,但精度较差(测量粒径240.5μm的液滴,相对误差为-5.1%,最大偏差50.2μm);对于典型大粒径喷雾,PDI-FPDR小粒径通道测量中值体积直径(MVD)大于75μm的喷雾适用性较差,大粒径通道的MVD测量值与Malvern粒度分析仪相比偏大。
Drop-size measurement of the supercooled large droplet(SLD)is very important for capacity building of the icing wind tunnel.In order to evaluate the capability of Phase Doppler Interferometer Flight Probe Dual Range(PDI-FPDR)in measuring the diameter of SLD,the standard droplet stream generated by a droplet generator,was used to evaluate the uncertainty of PDI-FPDR for drop size measurement.Then,for the real large-droplet spray,the particle size characteristic parameters were measured by Malvern and PDI-FPDR simultaneously.The large-droplet spray measurement capability of PDI-FPDR has been further evaluated.The results show that the small size range channel of PDI-FPDR can’t accurately measure large droplets,and its measurement results are much smaller than the real droplet size.The relative error of measuring a 189.0μm droplet is-72.8%.The measuring accuracy of the large size range channel is high,but the precision is poor.The relative error of measuring a 240.5μm droplet is-5.1%,and the maximum deviation is 50.2μm.For typical large-droplet spray,the PDI-FPDR small size range channel has poor applicability under measuring conditions of median volume diameter(MVD)greater than 75.0μm.The measured MVD values of PDI-FPDR large size range channel are larger than those of Malvern.
作者
陈舒越
郭向东
王梓旭
刘森云
吴迎春
CHEN Shuyue;GUO Xiangdong;WANG Zixu;LIU senyun;WU Yingchun(Key Laboratory of Icing and Anti/De-icing,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou Zhejiang 310027,China)
出处
《实验流体力学》
CAS
CSCD
北大核心
2021年第3期22-29,共8页
Journal of Experiments in Fluid Mechanics
关键词
结冰风洞
过冷大水滴
液滴粒径
液滴流
喷雾
icing wind tunnel
supercooled large droplet
droplet size
droplet flow
spray
