A new concept high-speed aircraft propulsion system layout method

Abstract

A new concept high-speed aircraft propulsion system layout method, in which two cycles are established in the propulsion system, namely the Brayton cycle with air as the working medium and the closed cycle with supercritical fluid as the working medium. The two cycles are coupled using supercritical micro-scale heat transfer technology and supercritical state fluid turbine and compressor work balance. By adjusting the relevant valves, the propulsion system is in the turbofan engine mode when taking off and flying at low speed, and in the turbo rocket engine mode when flying at a high Mach number, so as to ensure that the aircraft can cruise efficiently for a long time at both sub- and supersonic speeds. The supercritical micro-scale heat exchange technology adopted can effectively reduce the airflow temperature at the inlet of the compressor during high-speed flight, and its combined use with closed cycle technology can realize the optimal distribution of propulsion system energy. The invention effectively overcomes the shortcomings of the existing high-speed aircraft propulsion system, and significantly improves the working performance of the high-speed aircraft propulsion system in the range of Ma=0-5.

Description

technical field [0001] The invention relates to a propulsion system layout method based on turbofan-rocket combined engine and supercritical state fluid circulation, which is mainly used for the propulsion system of high-speed aircraft whose flight Mach number is within the range of 0-5. Background technique [0002] There is an urgent need for high-speed flight in the military and civilian fields, and high-speed aircraft is an important development direction in the future aviation field. In terms of military use, the implementation of global strikes and time-sensitive attacks will inevitably require aircraft with high-speed flight capabilities. In terms of civilian use, supersonic passenger and cargo transportation with good economy will bring great convenience to people's lives. Currently, one of the major problems plaguing high-speed flight is the propulsion system of the aircraft. Although many existing propulsion systems can provide power for high-speed aircraft, they ...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve high-speed flight, people first used hydrogen / oxygen rocket engine, which has a high thrust-to-weight ratio and can provide enough power for high-speed aircraft, but its application is limited due to the limitation of its launch method and the shortcomings of being unable to be reused. In a few fields such as aerospace propulsion and missile power; advanced turbojet engines can also provide power for aircraft in the range of flight Mach number 0 to 3, but when flying at higher speeds, their economy is poor and technical costs Too large, and it cannot provide enough power for aircraft operating at higher Mach numbers; ramjets can operate at high flight speeds with relatively good performance, but cannot start themselves at low speeds; turbines base combination engine such as figure 1 It combines the two technologies of turbine engine and ramjet engine, integrates the advantages of turbine engine and ramjet engine in their respective applicable flight ranges, and can be used for regular take-off and landing.

However, due to its high fuel consumption rate when flying at low speeds; when flying at high speeds, the turbine engine does not work and becomes an additional weight, and it needs thermal protection for its appearance, so far only a few practical engineering applications have been obtained.

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