Air inlet system of radial air inlet engine

The invention relates to the field of air inlet channel design, and discloses an air inlet system of a radial air inlet engine, the air inlet system comprises an air inlet channel, an air inlet volute and an engine air inlet casing, the air inlet channel is sequentially provided with an air inlet channel lip, a transition section, an expansion section and a 90-degree elbow in the airflow flowing direction, and an outlet of the 90-degree elbow is connected with an inlet of the air inlet volute; the transition section contracts firstly and then expands, so that the air inlet loss of the air inlet channel is reduced. The 90-degree bent pipe of the air inlet channel can be matched with an air inlet casing of the engine to convert air flow from radial air inlet to axial air inlet, the air inlet volute redistributes the air flow into full-circumferential air inlet, the air inlet quality of the radial air inlet engine is improved, and the aerodynamic performance and efficient and stable operation of the engine are g