A method for estimating radiant thermal environment characteristics of a floating device

Abstract

The invention belongs to the field of thermal environment analysis of a floating device, in particular to a method for estimating radiant thermal environment characteristics of the floating device. The method comprises the steps of calculating an outer atmospheric boundary radiation intensity Isun; calculating the intensity of direct solar radiation Id, 0; calculating the atmospheric transmittancetau atm, 0, tau atm, 0=Id, 0 / Isun; calculating the atmospheric transmittance tau atm at the height H according to the atmospheric transmittance tau atm at the surface, 0; according to the atmospherictransmittance tau atm at H and the outer boundary radiation intensity Isun, determining the direct solar radiation intensity Id at H, Id=Isun*tau atm; calculating the atmospheric transmittance tau IR, atm of surface long wave radiation at altitude H; determining the surface temperature Tground, and determining the surface long-wave radiation intensity according to the surface long-wave radiationtransmittance and emissivity and Boltzmann law. The invention estimates the radiant heat environment characteristic parameters at different altitudes H of the floating device released from the targetsite according to the less measured data, reduces the error of the calculation of the thermal characteristics of the floating device caused by the altitude and the geographical environment, and has guiding significance in the aspects of the thermal design of the floating device, skin material selection, flight test safety and the like.

Description

technical field [0001] The invention belongs to the field of thermal environment analysis of aerostats, in particular to a method for estimating the radiant heat environment characteristics of an aerostat. Background technique [0002] The aerostat is a huge low-dynamic aircraft that relies on buoyant gas to lift into the air. It has broad application prospects in communication relay, earth observation, space exploration and other fields. During the process of lifting and staying in the air, changes in the external thermal environment lead to changes in the temperature of the internal buoyant gas, which will affect its internal pressure, flight control and safety. The environmental thermal effect of the aerostat is mainly affected by the combination of convection and thermal radiation, and the thermal radiation is mainly affected by direct solar radiation and ground long-wave radiation. The thermal environment in different regions is very different, especially the radiant t...

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Problems solved by technology

The thermal environment in different regions is very different, especially the radiant thermal environment. In previous studies, the general empirical model was used to estimate, and it is difficult to reflect the impact of regional thermal radiation environment differences on the thermal characteristics of the aerostat.

Dai Qiumin (Research on the thermal environment and thermal characteristics of aerostats, doctoral dissertation of Nanjing University of Aeronautics and Astronautics, 2014) fitted the new direct solar radiation intensity and ground Long-wave radiation intensity model, the calculation accuracy has been improved, but this method has many types of measurement data, which is difficult to achieve in some areas with limited measurement conditions

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