It is said that China has proposed the concept of sub-orbits a long time ago. Aside from the common pulse shock, super-burn/sub-combustion stamping, and ion propulsion, which are mainly used for engines in outer space, can we develop a system that can be used in the atmosphere. What about the engine that can be used in sub-orbital? The theory is feasible, the key is cost, and it is always more expensive to perform a mission than launching a launch vehicle. Even if you use kerosene as fuel, you can't afford it! The United States originally proposed that the operation mode of an engine should be switched in different environments. As a result, it costs a lot of money to reach Mach 1.1 in the atmosphere and fly for one minute in the sub-orbit. What is the use of such a thing? Russia originally proposed a twin-engine concept, using vortex jets and sub-orbital stamping in the atmosphere. The result is also due to many problems and no final success.
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China has carried out the overall demonstration and preliminary technical research of turbine/stamped combined engines during the “Ninth Five-Year Plan†and “Tenth Five-Year Planâ€. After tracking foreign technology and independent innovation, it has launched its own unique turbine/stamping combined engine. To know the hypersonic aircraft, its flight envelope is wide (0~30km, Mach 0~5), cruise Mach is up to 5 times, and requires repeated use, regular level takeoff and landing, to achieve such design goals, any A single type of engine can't meet its requirements!
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The turbo/stamped combination engine is an aspirating engine that combines a turbine engine and a ramjet engine. According to the combination of the turbine engine and the ramjet engine, it can be divided into a split type and an integral combined engine, wherein the integral combined engine is further divided into a series layout and a parallel layout according to the relationship and flow of the main components of the turbine and the stamping type. In a turbo/stamped combination engine, the ramjet is divided into sub-combustion, super-combustion and dual-burning rams according to its operating mode. The sub-combustion ramjet engine adopts supersonic inlet, the inlet of the combustion chamber is subsonic airflow, and the propulsion speed can reach 6 times of sound velocity; the super-combustion ramjet engine starts to run at Mach 4~4.5, and the flight speed is Mach 16, which can theoretically reach Mach 25 In the double-burning ramjet engine, the combined working mode of sub-combustion and super-combustion is realized, and the running speed limit is about Mach 3, and the maximum flying speed is about Mach 6.5. The successful test flight of China's hypersonic unmanned aerial vehicles, which was exposed earlier, may be the combination engine of this type.
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