Cold flow test device for scaling linear plug type spray pipe carrier

Abstract

The invention discloses a cold flow test device for a scaling linear plug type spray pipe carrier. The cold flow test device comprises a lifting body component, a plug type spray pipe component, a force-measuring balance component and a supporting component, wherein a front part of a lifting body, a middle part of the lifting body and a rear part of the lifting body all have hollow structures and are fixedly connected in turn, so as to form a lifting body appearance of the carrier; the lifting body component comprises the front part of the lifting body, the middle part of the lifting body, the rear part of the lifting body, a vertical tail, a horizontal airfoil, an airfoil pin, a bottom cover plate and a belly cover plate; the plug type spray pipe component comprises a tail shell, a plug type spray pipe engine and an engine pin; the plug type spray pipe engine is mounted in the tail shell; the force-measuring balance component comprises a force-measuring balance and a balance protecting cover; and the supporting component comprises a supporting arm, a front rectifying cover and a rear rectifying cover. The cold flow test device has a simple structure and is low in cost; the plug type spray pipe engine of the cold flow test device is a single part, so that the structure is simple; the device is only applied to a cold flow test; and the ordinary carbon steel is selected as the raw material, so that the cost is low.

Description

technical field [0001] The invention relates to the technical field of aerospace engine testing, in particular to a multi-functional, simple-structured and low-cost cold flow testing device for a scaled-down linear plug nozzle carrier. Background technique [0002] Improving nozzle efficiency and reducing nozzle weight are the main goals of rocket engine design. Because aerospace vehicles have to experience different flight altitudes during flight, the traditional bell nozzle can only achieve the best performance at the design altitude, and higher or lower design altitudes will cause a certain performance loss, that is, under-expansion loss or overexpansion loss. Due to the open flow structure on the outside of the pneumatic plug nozzle, the gas is connected to the ambient pressure on one side, and the expansion state is automatically adjusted under the influence of the environmental back pressure. The gas is in a fully or nearly fully expanded state at the entire flight he...

AI Technical Summary

Problems solved by technology

The pressure at the bottom of the vehicle is lower than the ambient pressure, and there will be a certain resistance at the bottom of the vehicle, but this bottom resistance loss also exists for vehicles powered by traditional bell nozzle engines

The second part of the loss comes from the change of the pressure on the surface of the plug cone

The outflow occurs flow separation at the bottom of the carrier, causing the local pressure near the main flow of the plug cone to be lower than the ambient pressure at infinity, resulting in over-expansion of the main flow of the plug cone, and a decrease in the pressure on the wall of the plug cone

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