喷气式飞机诞生之初,发动机发展还不完善,其性能还不高,它所提供的推力太小,推重比也低,尽管如此,其速度还是比螺旋桨飞机的大多了。因为早期喷气飞机都是亚音速,所以这时的进气道也被称为亚音速进气道,虽形状各异,但它们在本质上是相同的。亚音速进气道的特点是进气通道短、进 The beginning of the birth of the jet engine, the engine development is not perfect, its performance is not high, it provides thrust is too small, the thrust-weight ratio is low, however, its speed is still much more than the propeller aircraft. Because the early jet aircraft were all subsonic, the intake at this time was also called the subsonic inlet, and they were essentially the same shape, albeit in different shapes. Subsonic intake is characterized by short intake channels, into