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Effect of High Temperature Supersonic Flow Conditions over Thermal Barrier Coating over a Flat Plate

Jeetendra Kumar Shah
2017 IARJSET  
For any supersonic missile, one of the most difficult task is to protect the missile's payload and internal components from the excessive heat generated during its flight due to the aerodynamic heating on missile surface. This can be done by applying a thermal barrier coating over missile surface. The performance of any supersonic missile coating can be judged by determining its erosion resistance and the amount of temperature reduction it can give in its substrate. Thus similar conditions were
more » ... lar conditions were simulated on ground at Scramjet Test Facility in DRDL, Hyderabad. The coating was tested at extreme temperature condition for studying its performance. The shear stress acting at the plate centre was calculated to determine the erosion resistance of the coating. For determining the temperature performance, both bare plate as well as coated plate were tested at flight conditions. The temperature at their' bottom surfaces were measured by using three K type thermocouples. These temperature data were compared to determine the amount of temperature reduction given by thermal barrier coating. After conducting the tests, the thermal barrier coating was found to be efficient for the application on missile surface. This missile coating can protect missile's payload and its internal component thereby increasing missile's efficiency and life. The specimen was fitted in flush with the nozzle exit of the air heater and airflow over the coating was tangential during the test 1 and 2, along with tangential flow the coating leading edges were also exposed to flow. These specimens were spot welded with 3 'K' type thermocouple to measure the back wall temperature of specimen during tests as shown in fig. 12.1
doi:10.17148/iarjset.2017.4403 fatcat:3n5t5ztifjb3xllawao6ff5ege