Axisymmetric dual-mode intake port for combined engine and mode switching method

Abstract

The invention discloses an axisymmetric double-mode air inlet passage for a combined engine and a mode switching method. The axisymmetric double-mode air inlet passage comprises a central body, a lipcover, a throat passage, a low-speed turbine passage, a high-speed pressing passage, a fixed supporting plate, a mode switching part and a hydraulic actuating device. The mode switching part is pushedto the backmost part, at the time, the low-speed turbine passage is completely opened, and the air inlet passage is under a turbine mode; and the mode switching part is pushed to the foremost part, at the time, the high-speed pressing passage is completely opened, and the air inlet passage is under a pressing mode. According to the axisymmetric double-mode air inlet passage for the combined engine and the mode switching method, a most suitable working mode can be provided for the combined engine, the aerodynamic performance of the air inlet passage at high speeds and low speeds can be realized, effective work of the combined engine in a wide flight envelope is ensured, and the axisymmetric double-mode air inlet passage has the advantages that the windward area is small, the layout is compact, the internal usable volume fraction is large and the like.

Description

technical field [0001] The invention relates to the field of aircraft design, in particular to an axisymmetric internal parallel air intake that can be used for combined engines. Background technique [0002] The intake port is an important part of the air-breathing combined engine. According to relevant research, every 1% increase in the total pressure recovery coefficient of the intake port outlet can increase the engine thrust by 1.5%. As far as the function of the intake port is concerned, it not only needs to efficiently provide air with a certain pressure, temperature and flow rate to the combined engine within a wide range of Mach numbers, but also undertakes the switching of working modes, the adjustment of the uniformity of the outlet flow field, and the isolation of upstream and downstream Disturbance and many other important tasks. For this reason, how to design a multi-modal intake port that can be used in combined engines has become one of the key technologies ...

AI Technical Summary

Problems solved by technology

However, in the case of using a three-dimensional axisymmetric inlet port, it is difficult for the designer to arrange the rotatable splitter plate like the above-mentioned binary TBCC inlet port, which means that once the axisymmetric inlet port configuration is adopted, it is difficult for the designer to Arrange the turbine channel and the ram channel in parallel, but have to adopt a series layout scheme, such as the J-58 engine equipped with the American SR-71 Blackbird aircraft

However, the tandem TBCC inlet is difficult to protect the turbine module when flying at a high Mach number, and the turbine module will cause a large flow loss when flying at high speed, thus affecting the overall performance of the engine at a high Mach number

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