Though the bleed can enlarge the thrust of the aerospike nozzle, it lessens the specific impulse except the case that the bleed is small at low flight altitude for the linear aerospike nozzle.

• 加入二次流会使塞式喷管的推力上升，但在大多数情况下其比冲会下降，只有特定压强比条件下，加入少量的二次流比冲才会上升。