A small high-speed turbojet engine with kerosene jet precooling

Abstract

The invention provides a small-scale high-speed turbojet engine with kerosene jet precooling, which is mainly aimed at high-altitude and high-speed conditions, and the temperature of the incoming air flow is relatively high under the high-altitude and high-speed conditions, which exceeds the capacity of the traditional conventional turbo engine compression system. The scope of work. By installing a jet kerosene device in front of the conventional turbine engine compressor, the high-temperature airflow in the intake passage is cooled by high-vaporization latent heat kerosene jet flow, atomization and evaporation, so that the total temperature of the airflow is reduced or maintained at a certain temperature, so that the engine compression system can be operated at a certain temperature. Work at the temperature of the inlet airflow to maintain the high Ma flight of the engine; the compression system is designed with a wide equivalent speed range, which can meet the stable working margin of the engine in a wide speed range; the combustion chamber will adopt the near equivalent ratio combustion design technology, which can The temperature in front of the turbine is greatly increased, the unit thrust is increased, and the working envelope of the engine is effectively expanded; the turbine guide and rotor blades are designed with kerosene cooling, which greatly simplifies the engine air system.

Description

technical field [0001] The invention relates to the field of aircraft power design, and relates to a supersonic aircraft power system, in particular to a small high-speed turbojet engine with kerosene jet precooling. Background technique [0002] As early as the 1950s, foreign countries had carried out research on jet precooling technology. In 2002, the U.S. Defense Advanced Research Projects Agency (DARPA) proposed the Rapid Response Small Load Low-Cost Carriage (RASCAL) program, which took jet precooling technology as one of the key research contents, and at the same time completed the simulation on the F100 engine under high-altitude conditions. The jet pre-cooling technology test verification of air intake heating, the pre-cooling device is installed in the air intake, including a liquid oxygen jet plane and two water jet planes, the front end is a liquid oxygen plane, followed by two spray water planes, which can be independent switch on switch off. The distance betwe...

AI Technical Summary

Problems solved by technology

In the technology of the existing hypersonic power system, small high-speed turbojet engines are often pre-cooled by water injection, but they need to carry a large amount of water, oxidant or volatile agent, and the problem of "dead weight" is difficult to solve, which greatly increases the weight of the aircraft and reduces the weight of the aircraft. Thrust-to-weight ratio, and can only work at supersonic speed for a period of time, and cannot stand by for a long time. It is currently in the demonstration stage and is not suitable for the flight platform's demand for low-cost supersonic power systems.

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