Hypersonic-speed and large-internal-contraction-ratio air inlet channel with stepless adjustable deflation valve and control method

Abstract

The invention discloses a hypersonic-speed and large-internal-contraction-ratio air inlet channel with a stepless adjustable deflation valve. The hypersonic-speed and large-internal-contraction-ratio air inlet channel with the stepless adjustable deflation valve comprises an air inlet channel front body, a deflation seam cover plate, a side wall, a lip cover, a deflation cavity, valve blades, a partition plate, a rotating shaft, a diffusion section and driving mechanisms. According to the actual working condition of the air inlet channel, the valve blades are rotated through the driving mechanism, the minimum section of a deflation flow path is changed, and stepless dynamic adjustment of the deflation flow of the air inlet channel can be achieved, so that the starting performance of the air inlet channel is improved, the pneumatic performance of the air inlet channel is improved, and the deflation resistance of an aircraft is reduced. According to the hypersonic-speed and large-internal-contraction-ratio air inlet channel with the stepless adjustable deflation valve provided by the invention, the valve blades on each of the two sides of the air inlet channel share one set of driving mechanism, and the driving mechanisms on the two sides are consistent in control rule, so that motor control is convenient to use; and the whole device is simple in structure, and the deflation flow can be adjusted without adopting a complex air inlet channel body adjusting device, so that the contradiction between the aerodynamic performance and the starting performance of the hypersonic-speed air inlet channel is solved.

Description

technical field [0001] The invention relates to the field of air intakes for hypersonic aircraft, in particular to a hypersonic air intake with a large internal contraction ratio with a steplessly adjustable deflation valve. Background technique [0002] As one of the key aerodynamic components of the air-breathing hypersonic propulsion system, the hypersonic inlet is responsible for many functions such as flow capture and regulation, incoming flow energy conversion and utilization, etc., which directly affects the working efficiency and working envelope of the propulsion system. In addition, according to the analysis, more than 50% of the total thrust of the ramjet operating at a high Mach number comes from the complex intake and exhaust system, so the performance of the hypersonic inlet is critical for the efficient and stable operation of the hypersonic vehicle in a wide speed range. very important. [0003] The capture and adjustment of the incoming flow by the intake p...

AI Technical Summary

Problems solved by technology

However, an excessively large internal contraction ratio will make the inlet throat prone to blockage, which will cause the inlet to fail to start automatically at the lowest operating Mach number, and the inlet will enter a non-starting state

The failure of the intake port seriously affects the normal operation of the propulsion system, and even leads to the failure of the entire flight mission

In addition, in the starting state of the inlet, since the deceleration and supercharging of the inlet and outlet airflows need to be completed through oblique shock wave supercharging, normal shock supercharging and subsonic supercharging, the hypersonic inlet faces the shock wave / boundary layer interference problem is complex

Severe shock wave / boundary layer disturbance induces flow separation, leading to a decrease in inlet performance, such as a decrease in the total pressure recovery coefficient, an increase in the total pressure distortion index, and a decrease in the subcritical stability margin, etc.

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