A test method for pressure change characteristics in the airdrop cabin of large-scale objects transported by aircraft

Abstract

The invention discloses a test method of a pressure variation characteristic in a transport aircraft large-sized object drop pod. An airplane model and an air-dropped material model are included. An air-dropped material model fixing column is arranged on a lower wall near a front wall of an inner cabin of the airplane model. Several fixing columns are arranged on the lower wall near the front wallof the inner cabin of the airplane model. A front portion of the air-dropped material model is connected to a lead. The air-dropped material model is connected and fixed with a constantan wire amongthe fixing columns through the lead. A rear portion of the airplane model is provided with a rear large cabin door. In the invention, a similarity criterion used for a pressure change test in the transport aircraft large-sized object drop pod is determined, a formula of converting pressure in the cabin during testing and corresponding change time to pressure changes in the drop pod during a flightcondition and the corresponding change time is proposed, a parameter calculation and model designing method of the air-dropped material model and extraction parachute model is given, and the method and steps of pressure variation wind tunnel test study in a transport aircraft large-sized object air drop aircraft cabin are established.

Description

technical field [0001] The invention relates to the technical field of ground testing of airplanes and other aircraft and the field of experimental aerodynamics, in particular to a method for testing the characteristics of pressure change in a large-sized object airdrop cabin of a transport aircraft. Background technique [0002] Wind tunnel experiment is the most important and widely used technical method to study and verify its aerodynamic characteristics in the process of aircraft development; the theoretical basis of wind tunnel experiment is the principle of similarity, and the key to whether a wind tunnel experiment method can obtain accurate results is Selection of similar criteria. [0003] When a transport plane drops a large-sized object by air, because the object is larger than the cross-sectional size of the cargo hold, a greater degree of blockage is formed. When the object moves to the rear large door of the cabin under the pulling force of the traction parachu...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for testing the characteristics of pressure change in the airdrop cabin of a large-scale object of a transport aircraft, so as to solve the above-mentioned disclosed or authorized patents proposed in the background technology. The study of the characteristics of the pressure change in the cabin during the airdrop of large objects, let alone the corresponding wind tunnel test method or numerical simulation method

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