Publications by authors named "David L Urban"
The flammability of combustible materials in a spacecraft is important for fire safety applications because the conditions in spacecraft environments differ from those on earth. Experimental testing in space is difficult and expensive. However, reducing buoyancy by decreasing ambient pressure is a possible approach to simulate on-earth the burning behavior inside spacecraft environments.
View Article and Find Full Text PDFThe flammability of combustible materials in spacecraft environments is of importance for fire safety applications because the environmental conditions can greatly differ from those on earth, and a fire in a spacecraft could be catastrophic. Moreover, experimental testing in spacecraft environments can be difficult and expensive, so using ground-based tests to inform microgravity tests is vital. Reducing buoyancy effects by decreasing ambient pressure is a possible approach to simulate a spacecraft environment on earth.
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- The study introduces a new thin-filament pyrometer using a consumer-grade digital camera (6 MP, 12 bits per color) to measure high temperatures.
- SiC fibers with a uniform diameter of 13.9 micrometers were used to conduct measurements in a methane-air flame, achieving gas temperatures between 1400-2200 K with a temperature uncertainty of +/-60 K.
- The pyrometer demonstrated good performance, with a spatial resolution of 42 micrometers and a temporal resolution of 0.66 milliseconds, and showed less soot deposition issues compared to traditional thermocouples.