进气道风洞试验气体流量计实况校准技术  

Actual-Calibration Technique of Gas Flowmeters in Inlet Wind Tunnel Test

作　　者：刘郡郡 李长坤[1] 滕鹏 周志坚[1] 唐滨滨 曹永飞 LIU Jun-jun;LI Chang-kun;TENG Peng;ZHOU Zhi-jian;TANG Bin-bin;CAO Yong-fei(Key Laboratory of Aviation Technology for Aerodynamics for Low Speed and High Reynolds Number,AVIC Aerodynamics Research Institute,Harbin 150001,China;AVIC Aerodynamics Research Institute,Shenyang 110000,China)

机构地区：[1]中国航空工业空气动力研究院低速高雷诺数气动力航空科技重点实验室,黑龙江哈尔滨150001 [2]中国航空工业空气动力研究院,辽宁沈阳110000

出　　处：《推进技术》2023年第12期174-181,共8页Journal of Propulsion Technology

摘　　要：为更精确地测量飞行器进气道风洞试验中流量参数,对进气道低速风洞试验中使用的小流量气体流量计开展实况校准方法研究,在FL-8风洞研制了一套工作压力小于0.1MPa,喷嘴Ma≤1,进气流量m≤2kg/s的基于音速喷嘴的可移动流量计校准系统。考虑到雷诺数与马赫数对流出系数的影响,采用依据实际风洞试验流量计工作状态参数的原则选取校准点;采取在流量计实际工作地点校准的方式以减小系统误差,校准后直接安装进气道模型进行风洞试验。试验结果表明:该校准方法重复性和装置稳定性良好,解决了现有流量计校准与实际试验中流动状态不一致,造成流出系数不准确的问题。有校准修正的流量要比无校准修正的流量相差2%~3%,由此引起进气道的性能参数差量达1%~2%。因此,该实况校准方法可有效减小测量误差,提升进气流量测量精准度。In order to more accurately measure flow parameters in aircraft inlet wind tunnel tests,an actu⁃al-calibration method under test conditions of gas flowmeters for small flow was investigated.A movable flowme⁃ter calibration system based on a sonic nozzle with working pressure less than 0.1MPa,whose nozzle Mach num⁃ber was less than or equal to 1,and the inlet flow rate less than or equal to 2kg/s was developed in the FL-8 wind tunnel.Considering the influence of Reynolds number and Mach number on the discharge coefficient,the princi⁃ple of selecting calibration points based on the actual working state of the flowmeter in wind tunnel tests was estab⁃lished.To reduce system errors,the method of calibration was adopted at the actual working site of the flowmeter.After calibration,the inlet model could be directly installed for tests.The experimental results indicate that the calibration system has good repeatability and stability,which solves the problem of inaccurate flow coefficients caused by inconsistent parameter settings between calibration and actual tests.The deviation of flow rate with cali⁃bration is 2%~3%compared with that without calibration,which causes the deviation of inlet parameters reach to 1%~2%.Therefore,this actual-calibration method can effectively reduce measurement errors and improve the accuracy of intake flow measurement.

关 键 词：风洞试验 进气道 实况校准 气体流量计 进气流量 

分 类 号：V211.74[航空宇航科学与技术—航空宇航推进理论与工程]