救生伞收口性能分析

PERFORMANCE ANALYSIS OF REEFED RECOVERY PARACHUTE

通过对ＡＣＥＳⅡ弹射座椅所使用的Ｃ－９伞收口速度补偿曲线的理论。分析了救生伞采用收口技术后，＿能在高速状态下降低开伞动载，在低速状态下不降低最低安全高度的原因；并对国产ＨＴＹ－４型弹射座椅装备了收口的救生－１３型伞后的性能进行了估算。假如收口阻力特征等于２０ｍ２、收口时间等于１０ｓ则在３０００ｍ高度上开伞动载将减小４０％；并论述了收口阻力特征和收口时间选取的原则。

Theoretical analysis is done for exploring speed-compensated reefing character of C-9 canopy used by ACES Ⅱejection seat. The reasons that opening shock is reduced at high speed and minimum safe altitude is not lowered at low speed after using reefing technics of recovery parachute are analysed. The character of chinese-built HTY-4 ejection seat with imaginary reefed recovery parachute JS-13 is estimated. If reefed drag area is equal to 2 0 square metre and time reefed equal to 1 0 second, the opening shock can be decreased by fourty percent at 3 000 metres altitude. Selective principle of reefed drag area and time reefed is discussed.