Pneumatic type/mechanical type combined adjustment mach number 0-7 stage combined engine air inlet

Abstract

The invention discloses a pneumatic type / mechanical type combined adjustment mach number 0-7 stage combined engine air inlet. The pneumatic type / mechanical type combined adjustment mach number 0-7 stage combined engine air inlet is mainly composed of a high-speed channel, a low-speed channel, a mechanical type variable geometry assembly and a pneumatic type shock wave adjusting assembly. Under the low-speed mode, the mechanical type variable geometry assembly is adopted for adjusting the throat area and the internal shrinkage ratio of the air inlet, and the low mach number starting performance and the high mach number compression performance of the air inlet are guaranteed; and under the high-speed mode, the pneumatic type shock wave adjusting assembly is used for adjusting the precursor shock wave position, the precursor shock wave sealing state is kept, and the discharge coefficient and the working performance of the air inlet are obviously improved within the wide mach number scope. According to the pneumatic type / mechanical type combined adjustment scheme, the compression amount and the precursor shock wave position of the air inlet can be continuously adjusted, it is guaranteed that the combined engine air inlet can effectively work within the wide mach number scope, and the good pneumatic performance is obtained.

Description

technical field [0001] The invention relates to the field of aircraft design, in particular to a combined engine inlet. Background technique [0002] The air-breathing combined engine has many advantages such as wide operating range, high reliability, reusability, horizontal take-off and landing, and high specific impulse, making it an ideal power plant for hypersonic vehicles. As an important part of the air-breathing combined engine propulsion system, the intake duct not only efficiently provides air with a certain pressure, temperature and flow rate to the engine in a wide range of Mach numbers, but also shoulders the responsibility of working mode conversion, outlet flow field, etc. Functions such as uniformity adjustment and isolation of upstream and downstream disturbances. For this reason, the wide Mach number range performance of this type of inlet is one of the key technologies for the development of air-breathing combined engines. [0003] The air-breathing combi...

AI Technical Summary

Problems solved by technology

Pneumatic adjustment methods (1) and (2) need to bleed air from the downstream compression surface and the downstream inner channel respectively to adjust the position of the upstream precursor shock wave and ensure the sealing of the precursor shock wave, so it is necessary to add a narrow and long bleed air pipe Road, throttle valve and sealing device, which not only increases the weight of the intake duct, takes up a large effective space, but also has an adverse effect on the starting performance and back pressure resistance of the intake duct; while the method (3) Although the same-level compression surface bleed air is used to avoid the defects of the first two adjustment methods, it can only be adjusted for a specific Mach number and cannot be infinitely adjusted. working performance under

In addition, the above-mentioned single pneumatic adjustment method can only adjust and reconstruct the precursor wave system of the inlet, so it can only adjust the flow coefficient, total pressure recovery, and flow field uniformity of the inlet, and cannot improve Self-starting ability and compression performance of the intake port

[0004] For this reason, it is necessary to develop a new combined engine inlet adjustment scheme, which can not only solve the problem of low reliability of a single mechanical adjustment under high Mach number conditions, but also avoid the above-mentioned problems of traditional pneumatic adjustment. defects, so as to ensure that the combined engine inlet can work effectively in a wide range of Mach numbers and obtain better aerodynamic performance

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