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3.2.3 滞后的可能性根据调节时阀门的位移方向,可能存在某些滞后原因。事实上,例如在图13中A点以上的大开度情况下进行调节时,如果增大压比,则在越过γ曲线时,激波将在第二段喷管中突然通过;从这个时候起,如果反过来减小压比,则在越过γ曲线时,激波可能下降到第二段喷管的临界截面,并且激波将突然通阀门。因此,不稳定性不出现在同一部位。在A点以下的开度情况下进行调节时,情况
3.2.3 Possibility of hysteresis Depending on the direction of displacement of the valve during adjustment, there may be some cause of hysteresis. In fact, if, for example, the adjustment is made with a large opening above point A in FIG. 13, if the pressure ratio is increased, the shock wave will suddenly pass through the second nozzle when it crosses the gamma curve; from this time If, on the other hand, the pressure ratio is reduced, the shock wave may fall to the critical section of the second nozzle when it crosses the gamma curve and the shock wave will suddenly flow through the valve. Therefore, instability does not appear in the same place. When the adjustment is made at the opening below A point