A triangular rotor engine combined cylinder molded line design method

Abstract

The invention discloses a triangular rotor engine combined cylinder molded line design method, and belongs to the field of rotor engines. The method comprises the following steps: determining three double-arc long-short-amplitude epicycloids, and establishing the three double-arc long-short-amplitude epicycloids in a Cartesian coordinate system by utilizing an eccentric distance and different generated radiuses; selecting a specified eccentric shaft rotation angle to determine three control points A, B and C; drawing inscribed circular arcs of the epicycloid at the three control points A, B and C, and connecting the three double-arc long-short epicycloid; selecting local curves of three double-arc long-short-amplitude extrochoids to be combined with four inscribed circular arcs, so that a combined type air cylinder theoretical molded line of the rotor engine can be drawn, and the combined type air cylinder theoretical molded line is deviated outwards by a certain distance to obtain a combined type air cylinder actual molded line. The influence of gas pressure on the radial sealing fin in the compression and combustion stages of the rotor engine is reduced, and the chatter condition of the radial sealing fin and the abrasion condition between the radial sealing fin and the molded surface of the air cylinder are improved; the combustion performance of the rotor engine is improved.

Description

technical field [0001] The invention designs a method for designing a combined cylinder profile of a triangular rotor engine, which belongs to the technical field of rotor engines. Background technique [0002] The traditional triangular rotor engine is equipped with radial seals at the three top corners of the rotor. The bottom of the radial seal is provided with a spring in a pre-tightened state, and the radial seal has a certain protrusion height in the installation groove. When the rotor is near the top dead center of combustion, the top of the radial sealing sheet is under the action of high-pressure gas, and the radial sealing sheet will move up and down. The up and down movement of the radial sealing sheet will affect the sealing performance of the rotary engine. When the rotary engine is in the air intake stage, the top of the radial seal is subjected to a small force from the gas. Under the action of the spring force, there is a certain contact stress between the t...

AI Technical Summary

Problems solved by technology

When the rotary engine is in the air intake stage, the top of the radial seal is subjected to a small force from the gas. Under the action of the spring force, there is a certain contact stress between the top of the radial seal and the cylinder profile, which accelerates the top of the radial seal. Wear between the surface of the cylinder and increase the frictional power loss of the engine

[0003] The theoretical cylinder profile of a traditional triangular rotor engine is a double-arc short-width epitrochoid, and the radius of the cylinder profile is set to a constant value during the design process, that is, the movement of the radial seal in the installation groove is not considered

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