Position feedback and protection device of sub-span super wind tunnel diffuser adjustment sheet

Abstract

The invention discloses a position feedback and protection device of a sub-span super wind tunnel diffuser adjustment sheet. The position feedback and protection device comprises a framework, a strokesensor, adjustment sheets, a simulation adjustment sheet, a limit switch and a wind tunnel body, wherein the adjustment sheets in a wind tunnel body cavity are symmetrically arranged at two sides ofthe central axis of the wind tunnel body, upstream ends of upstream adjustment sheets are attached to an inner wall surface of the wind tunnel body through an upstream stretching rod perpendicular toa wall surface of the wind tunnel body, downstream ends of the upstream adjustment sheets are hinged with one end of a throat stretching rod perpendicular to the wall surface of the wind tunnel body,the two symmetric upstream adjustment sheets form a required airflow channel, an airflow throat is formed at the narrowest point of the adjustment pieces, the downstream may have no adjustment sheet or is hinged with at least one downstream adjustment sheet segment through a downstream stretching rod perpendicular to the wall surface of the wind tunnel body, a tail end of the downstream adjustmentsheet is attached to an inner wall surface of the wind tunnel body, and the simulation adjustment sheet is in hinge connection with an outer side of the wind tunnel body through an upstream stretching rod, a throat stretching rod and a downstream stretching rod.

Description

technical field [0001] The invention relates to a position feedback and protection device for a regulating plate of a diffuser section of a sub-span super wind tunnel, and belongs to the field of test devices in wind tunnel tests. Background technique [0002] The sub-span super wind tunnel is a wind tunnel with a speed range of Mach number 0.4<M≤4.5. The principle of establishing sub-transonic flow field and supersonic flow field in the wind tunnel is very different: to establish sub-transonic flow field, the constricted nozzle is used to gradually reduce the cross-sectional area of ​​the air flow, so that the subsonic air flow is continuously accelerated; The sonic flow field adopts a scaling nozzle, which first gradually reduces the cross-sectional area to the minimum cross-section (that is, the first throat) to accelerate the airflow to the speed of sound, and then accelerates the airflow to supersonic speed through the expansion pipe. [0003] After the airflow pass...

AI Technical Summary

Problems solved by technology

In the past, the position control of the regulating plate in the diffuser section mainly relied on the precise control of the servo motor of the screw jack, and then manually measured the position of the regulating plate to correct the control output of the servo motor; or the transmission of the servo motor was decelerated by the mechanism and then transmitted to The potentiometer achieves the purpose of control feedback, and because this feedback still feeds back the stroke of the servo motor, there is no feedback to the final target adjustment piece of control, so the adjustment piece will still occur when the potentiometer or the transmission mechanism is abnormal. The control fails, resulting in abnormal position and angle of the regulating plate, mechanical damage of the regulating plate and other faults, which brings a lot of inconvenience to the normal test operation of the wind tunnel and poses a safety hazard

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