JPS6432998A - Air intake device for aircraft - Google Patents

Abstract

PURPOSE: To prevent the deterioration in the air intake characteristic at a large elevation angle of the aircraft body excellent in hiding by providing a main air intake to the upper surface of the aircraft body and an auxiliary air intake to the lower surface thereof, and by opening or closing the auxiliary air intake with a closing member. CONSTITUTION: At the time of an ordinary fight of an aircraft excellent in hiding, an auxiliary air intake 4 on the under surface of the aircraft body is closed by variable vanes 5-1 to 5-3, and the main air intake 2 on the upper surface 12 is used. When a maneuvering is carried out at a large elevation angle and the air flow on the upper surface of the aircraft flowing into the main air intake 2 begins to be disturbed, the variable vanes 5-1 to 5-3 are turned so as to open the auxiliary air intake 4, and the connection between the main air intake 2 and an engine 3 is cut off to supply a stable air flow to the engine 3 through the auxiliary air intake 4. Thus, while adopting the main air intake on the upper surface of the aircraft body excellent in hiding, the deterioration in the air intake characteristic at a large elevation angle can be eliminated by opening the auxiliary air intake on the under surface of the aircraft body, so that the stable operation of the engine can be secured.