Real-time model and simulation method of hypersonic scramjet

Abstract

The invention discloses a hypersonic speed super-combustion stamping engine real-time model. A simplified shock wave angle calculation method is adopted for the real-time model; an aircraft forebody and a super-combustion stamping engine air inlet are further regarded as an integrally-coupled forebody / air inlet; air flow in an isolation segment is regarded as uniform cross-section friction pipe flow; the volume effect of a combustion chamber is considered, and the combustion chamber is regarded as a cavity; an engine tailpipe and an aircraft afterbody are integrally coupled, and flow of fuel gas in the coupled body is regarded as variable cross section friction pipe flow; accordingly a combustion chamber outlet parameter is represented by a first-order ordinary differential equation based on a volume dynamic principle. The invention further discloses a simulation method of a hypersonic speed super-combustion stamping engine and a control law design method, compared with the prior art, the dynamic process of the hypersonic speed super-combustion stamping engine can be accurately reflected, a solution is easy to obtain, and the real-time property is better.

Description

technical field [0001] The invention relates to a scramjet engine, in particular to a real-time model of a hypersonic scramjet engine, which belongs to the field of system control and simulation in aerospace propulsion theory and engineering. Background technique [0002] Hypersonic Vehicle (HV for short) generally refers to an aircraft with an incoming Mach number greater than 5. It is favored by countries all over the world due to its advantages in speed and defense capabilities. In order to make the hypersonic vehicle have better performance, the vehicle and the engine are usually designed as one, and the power unit uses a scramjet engine. Therefore, whether the thrust generated by the scramjet can match the flight state of the hypersonic vehicle directly affects the flight performance of the hypersonic vehicle. It can be seen that it is very important to choose which method to control the engine thrust, and the engine modeling and simulation as the research basis of the...

AI Technical Summary

Problems solved by technology

[0004] To sum up, it can be seen that some work has been carried out on scramjet engine models at home and abroad, but they mainly focus on non-real-time steady-state performance analysis, and there are few real-time engine dynamic models for control system design. There is an urgent need for a A real-time model that can accurately reflect the dynamic process of the scramjet engine, thus laying the foundation for the real-time simulation of the dynamic process of the scramjet engine and the design of the control law

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