滞止压力低至10 kPa的音速喷嘴量值溯源方法探析  

Method for the tractability of Quantity Value of Sonic Nozzles with Stagnation Pressure as Low as 10 kPa

作　　者：李春辉[1] 苏金友 袁世辉 高山 周立媛 LI Chun-hui;SU Jin-you;YUAN Shi-hui;GAO Shan;ZHOU Li-yuan(National Institute of Metrology, Beijing 100029, China;Key Laboratory of High-altitude Simulation Technology, Mianyang, Sichuan 621024, China;College of Quality and Technical Supervision, Hebei University, Baoding, Hebei 071002, China)

机构地区：[1]中国计量科学研究院,北京100029 [2]高空模拟技术重点实验室,四川绵阳621024 [3]河北大学质量技术监督学院,河北保定071002

出　　处：《计量学报》2018年第B12期104-107,共4页Acta Metrologica Sinica

基　　金：国家重点研发计划(2017YFF0205305).

摘　　要：为解决的气体流量计量校准技术无法实现航空发动机在低压工作条件下气体流量的直接校准和量值溯源的问题,对音速喷嘴在较低滞止压力条件下的直接校准和量值溯源方法进行探析与研究。首先,采用pVTt法气体流量基准装置在大气压条件下对4块名义喉径为40mm的音速喷嘴进行了测试;其次,基于5支标准音速喷嘴,采用音速喷嘴串联的方式实现了最低至10kPa滞止压力的音速喷嘴的实流校准;最后,对测得的流出系数与喉部雷诺数的平方根倒数进行了线性拟合。基于拟合程度较高的线性拟合结果,验证了该校准方法的可行性和准确性。In order to solve the problem that the existing gas flow measurement calibration technology can not achieve the direct calibration of the air engine s gas flow under low pressure operating conditions and the traceability of the quantity value, the method of direct calibration and quantity tracing of sonic nozzles under low stagnation pressure was studied. Firstly, four sonic nozzles with nominal throat diameter of 40 mm were tested under atmospheric pressure using the gas flow reference device of pVTt method. Secondly, based on five standard sonic nozzles, the real flow calibration of sonic nozzles with a minimum of 10 kPa stagnation pressure is achieved by using a series of sonic nozzles. Finally, the discharge coefficient measured is linearly matched with the square root reciprocal of the Reynolds number in the throat of nozzle. Based on the linear fitting results, the feasibility and accuracy of the method are verified.

关 键 词：计量学 气体流量计量 校准 量值溯源 滞止压力 线性拟合 

分 类 号：TB937[一般工业技术—计量学]