Plug cap for air inlet path of engine and opening-closing system for plug cap

Abstract

The invention discloses a plug cap for an air inlet path of an engine. The plug cap comprises a plug head and a connecting rod; the plug cap is an arc-shaped structure which is formed by enabling an end cover to rotate around an axis in a nose cone of the engine; the end surface consists of an L-like shaped curve, and line segments OM and ON which are separately connected to two end points of the curve C through a point O; the line segments OM and ON rotate to form a pneumatic molded surface; after the L-like shaped curve rotates, the initial section, the middle section and the tail section of the L-like shaped curve separately form a first side surface, a second side surface and a third side surface; the first side surface is adaptive to the lower conical surface of the nose cone of the engine; the third side surface is adaptive to the outer wall of a lip of the air inlet path of the engine; a gap is formed between the second side surface and the outer wall of the lip of the air inlet path; when the plug cap is closed, the first side surface and the third side surface are fitted to the plug head; an angle MON of the end surface is divided into two parts by a straight line passing through the point O, the part close to the nose cone is an upper angle being 14-20 degrees, and the other part is a lower angle being 16-17 degrees; and in the airflow direction, the projective plane of the plug head completely covers the lip of the air inlet path of the engine.

Description

technical field [0001] The invention belongs to the field of ramjet free jet flow test, and in particular relates to an engine intake passage blocking cover and an opening and closing system thereof. Background technique [0002] The separation and transfer test mainly simulates the separation process of the solid booster and the liquid ramjet under the free jet test conditions to ensure that the flow state in the ramjet inlet is closer to the real inlet before and after the separation of the solid booster. [0003] During the stage separation test, the ramjet engine is in a high-speed simulated environment flow. Before the separation of the solid booster, it is required that the lip of the ramjet inlet should be covered with a cover and have certain sealing requirements (the sealing gap is not greater than 2mm), so as to prevent the ambient flow from entering the ramjet inlet. After the cover of the cover opening and closing system is opened, the ambient flow enters the in...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing plugging cap cannot meet the sealing requirements, and the opening time of the plugging cap exceeds 100ms, the present invention proposes a plugging cap for the engine inlet port and a plugging opening and closing system. The sealing gap is only 2mm, and the cover opening and closing system can fully open the cover in only 70ms, which can realize the fast switching between the closed and open states of the intake port of the ramjet

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