The invention belongs to the field of aircraft flight quality test flight, and particularly relates to a method for determining aircraft anti-tail spinning parachute parameters, which comprises the following steps: preliminarily obtaining an SCD rough value through an empirical formula, obtaining SCD2 through equivalent conversion of a dynamic similarity criterion, carrying out a vertical wind tunnel tail spinning test to obtain SCD1 ', and converting the SCD1 'into the size of an external field free flight model, then carrying out an outfield model free flying tail spin test until the umbrella resistance area SCD2'with the minimum size capable of changing the tail spin within the set number of turns is obtained; performing conversion through a conversion formula to obtain the reverse tail spinning parachute resistance area SCD real aircraft and the reverse tail spinning parachute cord length L parachute real aircraft of the real aircraft; and measuring the resistance coefficient CD of the anti-tail-spin umbrella through a wind tunnel force measurement test or numerical simulation calculation to obtain the geometric area S true machine of the anti-tail-spin umbrella. Reliable and feasible parameters of the anti-tail-spin umbrella are obtained through the steps, so that the parameters of the anti-tail-spin umbrella meet the requirement that tail spin is changed within two circles, and meanwhile it is guaranteed that the resistance area of the tail-spin umbrella is minimum.
本申请属于飞机飞行品质试飞领域,特别涉及一种确定飞机反尾旋伞参数的方法,通过经验公式初步得到SCD粗略值,经过动力学相似准则等效换算得到SCD2,开展立式风洞尾旋试验得到SCD1'并换算到外场自由飞模型的尺寸,然后开展外场模型自由飞尾旋试验,直至得到能能够满足设定圈数内改出尾旋的最小尺寸的伞阻力面积SCD2′;通过换算公式换算得到真飞机的反尾旋伞阻力面积SCD真机和反尾旋伞伞绳长度L伞真机;通过风洞测力试验或数值模拟计算,测定反尾旋伞的阻力系数CD,得到反尾旋伞的几何面积S真机。通过上述步骤得到可靠、可行的反尾旋伞参数,使得该反尾旋伞的参数满足2圈内改出尾旋的同时且保证了尾旋伞阻力面积最小。
Method for determining anti-tail-spin parachute parameters of airplane
一种确定飞机反尾旋伞参数的方法
2025-04-11
Patent
Electronic Resource
Chinese
IPC: | G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT / G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung |
Improved tail cone for changing airplane stall into parachute outlet
European Patent Office | 2025
|NTIS | 1978
|Landing an airplane by parachute
Engineering Index Backfile | 1929
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