Simulating the Benešov bolide flowfield and spectrum at altitudes of 47 and 57 km

نویسندگان

چکیده

This paper develops a computational fluid dynamics capability for simulating the radiative emission from meteor shock-layer and wake to an external observer. The developed includes impact of radiation ablation on flowfield, where coupled accounts flowfield energy equations injection species meteoroid surface into flow. updated chemistry nonequilibrium models, which are compiled literature. To provide level validation this capability, Benešov spectral measurements considered. Although was likely fragmented at 47 57 km altitudes considered, measurement uncertainty is roughly ± 50%, these represent best available relatively large (meter-class) bolide. determine equivalent diameter simulations, continuum component spectrum in 570 610 nm range wavelength dominated by air high pressure temperature front meteoroid, simulated with small (compared emission) sensitive diameter. Because characteristics, adjusted until matches measurements. results diameters ranging 0.62 0.9 m. due various geometries increasing bluntness decreases required Applying simulations spectra that compare within 30% measured values, considering integrated values between 400 650 nm. agreement well estimated 50%. All major features captured simulations. A comparison wake-only suggests locations over 150 m primary source disagreement seen Overall, good provides model has not been previously available. • State-of-the-art luminosity flow regime. Developed finite-rate chemistry, radiation, ablation, radiation. Model compares favorably Benesov altitude. Favorable demonstrated model.

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ژورنال

عنوان ژورنال: Icarus

سال: 2021

ISSN: ['0019-1035', '1090-2643']

DOI: https://doi.org/10.1016/j.icarus.2020.114037