A test method for changing the angle of attack of an arc heater

Abstract

The invention relates to an attack-angle-changing test method for an electric arc heater. The attack-angle-changing test method includes mounting a test device; performing a state debugging test, operating the electric arc heater, changing the attack angle of a calibration model by an attack angle changing device, measuring cold-wall heat flows under different states by a water cooling heat flow sensor, and acquiring a discrete debugging state distribution map; putting an track curve into the discrete debugging state distribution map, selecting the discrete debugging states of the track curveto perform joint coordination, changing the attack angle by the attack angle changing device, connecting the discrete states in series, adjusting the change speed of the attack angle to smoothen the simulated track curve, and tracking the heat flow changes of the surface of the model in real time by the water cooling heat flow sensor; replacing the water cooling calibration model by a formal testpiece, keeping the test piece at the same position, and eroding the test piece according to a joint coordination program. The attack-angle-changing test method has the advantages that the efficiency of the state debugging test can be improved, the matching range of surface heat flows / enthalpy values of test pieces in the same batch can be widened, and the parameter change capability close to the real trajectory changes can be realized.

Description

technical field [0001] The invention relates to the technical field of ground heat protection tests for hypersonic aircraft, in particular to a test method for changing the angle of attack of an arc heater. Background technique [0002] Hypersonic vehicles will experience severe aerodynamic heating loads during flight, and their heat-resistant components usually require ground test assessments before they are formally finalized and put into production. Arc heaters are the most commonly used equipment for ground thermal protection tests. The turbulent plate test method is usually used for the assessment of flat or similar flat large-area materials. The high-temperature gas flow generated by the arc heater forms a laminar boundary layer when it passes through the transition section and turns into a turbulent boundary layer near the nozzle throat. At the outlet of the supersonic rectangular nozzle wall, place a flat specimen parallel to the airflow direction or at a certain an...

AI Technical Summary

Problems solved by technology

[0004] Since the angle of attack of the specimen cannot be changed during the test, on the one hand, this method is not capable of simulating large-span parameter changes, and cannot take into account the highest and lowest thermal environments of the ballistic trajectory in one test, and needs to increase the matching range of heat flow / enthalpy; On the other hand, the current step-variable parameter simulation capability is relatively "rough" to the approximation of the ballistic trajectory, and the degree of reproduction of the ballistic thermal environment is not accurate enough

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