Method and device for detecting binary flexible nozzle contour of supersonic wind tunnel

Abstract

The invention relates to the field of aerospace wind tunnel tests. The invention aims at solving the problems in the prior art and provides a detection method and device. Through the adoption of the method, whether the sidewalls of a binary flexible nozzle of a supersonic wind tunnel are in a working condition during closing or a maintenance state during opening, the rapid detection of a nozzle contour can be realized, so that the preparation time of the nozzle contour detection is greatly shortened, the nozzle contour detection efficiency is effectively improved, and the reliability of a nozzle contour measurement result is guaranteed. A reference coordinate system is established on the premise that a laser tracker is erected on a downstream independent platform of a nozzle outlet to measure points and lines fixed on the nozzle; a point of intersection of an XOY plane, an XOZ plane and a plane constructed according to an outlet flange surface of the nozzle is taken as an origin of thereference coordinate system, and the reference coordinate system is established through the origin; and a measurement mode for space coordinates of the side edges of an upper wall plate and a lower wall plate is that a target ball is simultaneously attached to the sidewalls of the nozzle, the upper wall plate and the lower wall plate to move axially for measurement.

Description

Technical field [0001] The invention relates to the field of aerospace wind tunnel testing, in particular to a method and device for detecting a dual flexible wall nozzle profile of a supersonic wind tunnel. Background technique [0002] The nozzle is the core section of the supersonic wind tunnel. The nozzle profile is the key to obtain the test Mach number. Its change will not only lead to the change of the actual test Mach number, but also affect the spatial flow field (full flow field or partial flow field). ) Will affect the reliability of the test data. Therefore, the nozzle profile needs to be inspected regularly. [0003] The binary flexible wall nozzle mainly adopts the frame structure, the structure diagram is as follows figure 1 , figure 2 As shown, figure 1 1 is the left and right frame, 2 is the upper and lower beams supporting the upper and lower wall actuators, 3 is the upper and lower wall panels, 4 is the upper and lower wall actuators, and 5 is the left and righ...

AI Technical Summary

Problems solved by technology

After the nozzle profile inspection is completed, it takes a lot of time to remove the auxiliary measuring device and close the side wall, which greatly limits the optional time for nozzle profile inspection.

[0007] Measurement results are not reliable

Since the tracking head of the laser tracker is installed on the lower beam of the nozzle, when the nozzle surface is replaced, the vibration generated by the action of the actuator is likely to cause the position of the tracking head to change. If the coordinate system is not corrected, it is likely to affect the nozzle. Authenticity of pipe surface inspection results

It is also a cumbersome work to correct the coordinate system before each surface inspection

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