离心喷嘴初始雾化性能PDPA及DOH对比试验  

Comparative experiment on initial atomization performance of centrifugal nozzle with PDPA and DOH

作　　者：王东辉 黄勇[1,2,3] 汪磊 吴迎春 WANG Donghui;HUANG Yong;WANG Lei;WU Yingchun(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,Beihang University,Beijing 100191,China;Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]北京航空航天大学航空发动机气动热力国家级重点实验室,北京100191 [3]先进航空发动机协同创新中心,北京100191 [4]浙江大学清洁能源利用国家重点实验室,杭州310027

出　　处：《航空动力学报》2022年第11期2513-2523,共11页Journal of Aerospace Power

摘　　要：为了开展离心喷嘴初始雾化阶段雾化性能研究,结合传统的相位多普勒颗粒分析仪(PDPA)和新兴的数字离轴全息术(DOH)两种测试方法对离心喷嘴雾化性能进行了测试。测试过程中,以航空煤油RP-3为工质,保持燃油压力为0.8 MPa不变,改变燃油温度(240~300 K)。测试结果表明:初始雾化阶段SMD空间分布呈“单峰”分布,且随着轴向距离的增大,SMD的峰值变大,峰值位置向外侧移动;对于初始雾化阶段的同一轴向位置,油温的改变会同时影响液膜破碎长度和液滴破碎过程,使燃油温度对SMD分布无明显的规律性;DOH液滴识别算法会将重叠的液滴识别为液丝或不规则液滴排除在统计范围内,使DOH测得的SMD和液滴尺寸微分分布峰值位置较PDPA偏小;DOH可以直接观察到液膜破碎过程和破碎后的液滴分布情况,有助于对试验结果进行分析。To study the atomization performance of the centrifugal nozzle in the initial atomization stage,a traditional phase Doppler particle analyzer(PDPA) and a digital off-axis holography(DOH) were used. Using aviation kerosene RP-3 as the working fluid and maintaining the fuel pressure at 0.8 MPa,the atomization performance of the centrifugal nozzle at different fuel temperatures(240—300 K) was studied.The experimental results showed that: the spatial distribution of the Sauter mean diameter(SMD) in the initial atomization stage presented a “single peak” distribution,and with the increase of the axial distance,the peak value of the SMD increased,and the peak position of the SMD moved to the outside;for the same axial position of the initial atomization stage, because the change of fuel temperature could affect the length of the liquid film and the process of droplets breaking, the fuel temperature had no obvious regularity to the SMD distribution;the algorithm of droplets identification could identify the overlapping droplets as liquid filaments or irregular droplets. And the algorithm might exclude overlapping droplets from the statistical range,so the SMD and the peak position of the differential distribution of droplets size and number measured by DOH was smaller than that of DOH;DOH can directly observe the breaking process of the liquid film and the distribution of droplets,helping to analyze the experimental results.

关 键 词：粒径空间分布 离心喷嘴 燃油温度 相位多普勒颗粒分析仪(PDPA) 数字离轴全息术(DOH) 

分 类 号：V231.23[航空宇航科学与技术—航空宇航推进理论与工程]