Temperature acquisition assembly and electric arc wind tunnel flat plate test piece surface heat flux density measurement method

Abstract

The invention provides a temperature acquisition device and an arc wind tunnel flat plate test piece surface heat flux density measurement method, the device comprises a metal flat plate, a heat insulation frame and thermocouples, the heat insulation frame surrounds the metal flat plate, the two thermocouples are installed at the center of the lower surface of the metal flat plate, and the distances between probes of the two thermocouples and the upper surface of the metal flat plate are different. The temperature acquisition assembly is arranged at a to-be-measured position of an arc wind tunnel nozzle outlet. The temperature acquisition assembly can measure temperature repeatedly for a long time and calculate the heat flux density through temperature data, and in combination with the heat flux density measurement method, the change process of the transient heat flux density can be measured in a short time, and the steady-state heat flux density and the radiation equilibrium temperature can be measured for a long time.

Description

technical field [0001] The invention belongs to the technical field of arc wind tunnel test, and in particular relates to a temperature acquisition component and a method for measuring the surface heat flux density of a flat plate test piece in an arc wind tunnel. Background technique [0002] Conducting arc wind tunnel tests always accompanies all aspects of aircraft development. It is often expensive to directly conduct wind tunnel tests on the whole aircraft. Under the condition of limited cost, it is a more reasonable choice to intercept the local structural features of the aircraft to carry out tests. The hole test is one of the most common. [0003] Before carrying out the flat arc wind tunnel test, it is necessary to check the inflow state of the wind tunnel to ensure that the airflow state at the outlet of the wind tunnel nozzle can meet the requirements. where the heat flux q on the surface of the plate surface It is one of the basic basis for judging whether the ...

AI Technical Summary

Problems solved by technology

The water card calorimeter measures the heat flux density by measuring the steady-state temperature rise of the cooling water, the response time is slow, and it can only measure the steady-state heat flux density, and cannot measure the real-time change process of the heat flux density; thin-wall calorimeter and plug calorimeter The measurement principle of the meter is the same, both measure the back temperature of the metal under heating conditions, and obtain the time change rate of the temperature by fitting the linear segment of the temperature rise curve, thereby calculating the surface heat flux

However, the thin-walled calorimeter is limited by the small wall thickness of the shell and the small heat sink, and there is a strict limit on the longest working time; while the plug-type calorimeter has a slightly longer working time than the thin-walled calorimeter, but its life is shorter. Long cooling time, unable to test multiple times in a short time

[0005] In summary, there are still problems with the existing heat flux measurement methods in flat plate arc wind tunnel tests, and it is still necessary to explore convenient and effective heat flux measurement methods with less restrictions

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