| 摘要 |
PURPOSE:To facilitate to reform the existing nozzle with a simple mechanism, increase a propulsive efficiency and permit to increase a thrust by a method wherein a valve, opening and closing by a pressure difference between the outlet pressure of the first stage nozzle and an atmospheric pressure, is provided at a step part between first and second stages in the device equipped with the nozzle of two stages. CONSTITUTION:The outside pressure Pa is higher than the inside pressure k1Pe1 during launching and low-altitude flying, therefore, the valve 3 is kept in an opened condition, atmospheric air is introduced into the nozzle 2 through a step- like clearance and the generation of the thrust is performed by the nozzle 1 principally. Next, the pressure Pa is decreased as the flying altitude is increased, however, the outlet pressure of the nozzle 1 is constant, therefore, the valve 3 is opened automatically by the difference between the inside and outside pressures of the valve 3 when the altitude, in which the pressure K1Pe1 is higher than or equal to the pressure Pa, is achieved. Thereafter, gas, generated in a combustion chamber, flows through the nozzle 1 and the nozzle 2 fully, whereby, the nozzles operate as the nozzle having a capacity corresponing to the nozzle having a large opening ratio. |
