【摘要】 针对目前国内外使用的拖锥法空气静压测量精度不高的问题,提出一种新型外置式空速精密校准方法,并对新方法测量装置中的核心器件微小型静压管进行了设计研究。微小型静压管的长度、管径、静压孔尺寸、静压孔个数及分布等,均对静压测量产生影响,而静压孔孔径的影响尤为显著。将不同静压孔孔径的微小型静压管放置到设定的试飞环境参数下,对静压管流场进行模拟仿真,同时将目前拖锥法中使用的静压管放到相同环境下进行模拟计算,通过分析对比优化静压孔的孔径。优化后的静压孔孔径为1.05mm,管内稳态压力与环境压力的相对误差为0.38%,能大幅提高静压测量精度。更多还原

【Abstract】 To deal with the low-accuracy problem when measuring the static air pressure using the trailing cone method,it propose a brand-new and precise external airspeed calibration method by designing a micro static tube,which is the core part in the new device. Lots of factors including the length and diameter of the micro static tube,the diameter,number and distribution of the static pressure holes will all influence the measurement result of the static pressure,and as a matter of fact the diameter of the static pressure holes is more than important among them. To do the computations and simulations,into a flight-test environment with preset parameters,it placed a micro static tube with multiple static pressure holes of different diameters; at the meantime,it also put a static pressure tube from the trailing cone method in that environment. By comparing the results of different static pressure holes,it found the best diameter of the static pressure hole is 1.05mm,in which situation the difference between the static pressure inside the tube and the pressure in the environment was 0.38%,and can substantial increase in static pressure measurement accuracy.更多还原