Ablation test technique of large scale structure component in arc-heated wind tunnel

It is a great challenge for arc heater facilities to carry out large scale thermal structure test, because this kind of test need high power arc heater and large scale supersonic nozzle. Based on the capability of existing arc heater facility, the flow field of large scale wing components is calibrated using improved supersonic turbulent duct and cold air shrouded flow technique. In the test, by means of the air channel constituted with water cooling copper panels and gas cooling quartz glass, the serious problem of flow field attenuation caused by the flow expansion at the nozzle outlet is solved successfully. The calibration result shows that the heat flux decreases on the wing surface and wing edge have changed from 51.5%~73.6% to 34.0%~40.0% and 68.0% to 43.7% respectively, and the heat flux distribution on the wing becomes more uniform. At the same time, there is a significant difference from the traditional closed supersonic duct test, the ablation process can be recorded and the surface temperature of the wing can be measured during the test through the gas cooling quartz glass.The test result shows that the techniques mentioned above can be effectively used to evaluate thermal structural performance and survivability of large scale components in arc heated wind tunnel.