Secondary flow self-circulation pneumatic adjustable inlet port and control method of same-stage compression surface

Abstract

The invention discloses a secondary flow self-circulation pneumatic type adjustable air inflow passageway for an in-step compression surface. The front portion of an air inflow passageway compression surface is coated with an overflow cover plate, a pressure stabilization cavity is formed in the position below the overflow cover plate, and a rotating cover plate is arranged on the compression surface and located at the rear end of the overflow cover plate. When the rotating cover plate is located at the opening position, oblique shock waves are induced from a flow field, airflow is compressed through the oblique shock waves and enters the pressure stabilization cavity to form a secondary flow under guiding of the rotating cover plate, and thus the secondary flow is driven to flow on the in-step compression surface by artificial differential pressure; and owing to the pre-pressurization effect of the shock waves, the pressure of the secondary flow is higher than the pressure of an upstream incoming flow, and thus the secondary flow can smoothly be sprayed and injected into the flow field through the overflow cover plate.

Description

technical field [0001] The invention relates to the field of aircraft air intake design. Background technique [0002] As the air intake device of the ramjet engine, the air intake is one of the three key aerodynamic components of the air-breathing propulsion system. It directly faces the high Mach number incoming flow and the combustion chamber with complex working conditions. Its design form and working characteristics significantly affect the It affects the overall performance of the entire propulsion system and even the aircraft. In practical applications, the ramjet needs to work in a wider flight envelope, which requires the inlet to have a wider working range of Mach number. However, the highest flight Mach number is usually taken as the design point in the design of conventional geometric inlets to ensure that the compression wave system of the precursor at this time is close to the mouth. However, the shock-to-mouth state of the fixed-geometry inlet is only realiz...

AI Technical Summary

Problems solved by technology

However, this kind of technology needs to arrange complicated accessories, which will occupy a lot of valuable space of the aircraft, and will also have a certain negative impact on other electronic equipment of the aircraft.

It can be seen from this that the existing various control technologies have obvious shortcomings, and are subject to many restrictions in the actual use process.

Images