Memory-alloy driving front ducted ejector of variable-cycle engine adjustable mechanism

Abstract

The invention relates to a memory-alloy driving front ducted ejector of a variable-cycle engine adjustable mechanism. The memory-alloy driving front ducted ejector comprises a core driving fan case, memory alloy wire bases, pulleys, memory alloy wires, wire locking devices, gaskets, crankshafts, spherical hinge covers, spherical hinge balls, connecting rods, studs, stud supports, a valve body anda bias spring. The memory alloy wires are used as mechanism driving pieces, when the temperature is raised by external electric heating, the length is reduced due to the shape memory effect, displacement generated by the memory alloy wires is amplified by the lever effect of the crankshafts and then is transmitted to the valve body through the connecting rods to enable the valve body to be turneddown, and thus the temperature is adjusted and the flow from a core driving fan to an outer duct is controlled; when electric heating is stopped, the memory alloy is at a low-temperature phase, the bias spring pulls open the valve body, and simultaneously, the memory alloy wires are stretched to be in a loading state. The memory-alloy driving front ducted ejector can be matched with other adjustable mechanisms to convert the working state of a variable-cycle engine, and has the advantages of being small in structure weight, reliable in movement, small in influence on flow channels and the like.

Description

technical field [0001] The invention relates to a memory alloy-driven front duct ejector with an adjustable mechanism for a variable cycle engine, which is used to realize the state conversion of the front duct ejector to adjust the working state of the engine, and belongs to the high-performance fuel gas in aerospace technology The field of turbine engine technology. Background technique [0002] Foreign variable-cycle engines started in the 1970s. Various schemes have been proposed and have been thoroughly studied. At present, there are models that have passed experimental verification. However, domestic variable-cycle engine designs have only begun in the 21st century, and are still in the process of principle research and development. Design exploration stage. [0003] A variable cycle engine refers to a gas turbine engine that changes its thermodynamic cycle by changing the geometry, size or position of certain parts of the engine. Its typical adjustable mechanism mai...

AI Technical Summary

Problems solved by technology

[0007] The technical problem of the present invention is: in order to overcome the deficiencies of the prior art in terms of structural weight, mechanism complexity, control system complexity, etc., to provide a memory alloy drive front duct ejector with an adjustable mechanism for a variable cycle engine, By heating and cooling the memory alloy wire, the drive mechanism moves, so that the ejector outlet area between the inner and outer ducts of the engine can be continuously adjusted, the mechanism is simple, the number of parts is small, and the weight is light

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