The existing methods for detection of the cloud scenes are applied at relatively small spectral range within shortwave upwelling radiative wavelength flux. We have reported a new method for detection of the cloud scen...The existing methods for detection of the cloud scenes are applied at relatively small spectral range within shortwave upwelling radiative wavelength flux. We have reported a new method for detection of the cloud scenes based on the Radiance Enhancement (RE). This method can be used to cover a significantly wider spectral range from 1100 nm to 1700 nm by using datasets from the space-orbiting micro-spectrometer Argus 1000. Due to high sunlight reflection of the smoke originated from the forest or field fires the proposed RE method can also be implemented for detection of combustion aerosols. This approach can be a promising technique for efficient detection and continuous monitor of the seasonal forest and field fires. To the best of our knowledge this is the first report showing how a cloud method can be generalized for efficient detection of the forest fires due to combustion-originated reflectance.展开更多
The importance of radiative heat transfer in the simulation of indoor-fire has been studied.Computer codes have been developed based on four-flux model and discrete transfer model,respectively.Evaluation of the codes ...The importance of radiative heat transfer in the simulation of indoor-fire has been studied.Computer codes have been developed based on four-flux model and discrete transfer model,respectively.Evaluation of the codes against exact analytic solution and experimental data shows that the discrete transfer model gives numerical results with acceptable accuracy while the four-flux model underpredicts the heat fluxes although the gen- eral trend is reasonable.Numerical studies have been performed of two-dimensional,axisymmetric turbulent, buoyancy-controlled indoor fire.The computational results show that neglecting radiation in the simulation can cause overprediction of 500K in the maximum temperature and less uniform velocity field compared to the prediction by discrete transfer model.The four-flux method has been found to produce less uniform velocity and temperature values than discrete transfer model,but is more economic in computation.展开更多
文摘The existing methods for detection of the cloud scenes are applied at relatively small spectral range within shortwave upwelling radiative wavelength flux. We have reported a new method for detection of the cloud scenes based on the Radiance Enhancement (RE). This method can be used to cover a significantly wider spectral range from 1100 nm to 1700 nm by using datasets from the space-orbiting micro-spectrometer Argus 1000. Due to high sunlight reflection of the smoke originated from the forest or field fires the proposed RE method can also be implemented for detection of combustion aerosols. This approach can be a promising technique for efficient detection and continuous monitor of the seasonal forest and field fires. To the best of our knowledge this is the first report showing how a cloud method can be generalized for efficient detection of the forest fires due to combustion-originated reflectance.
基金Sponsored by the National Natural Science Foundation of China
文摘The importance of radiative heat transfer in the simulation of indoor-fire has been studied.Computer codes have been developed based on four-flux model and discrete transfer model,respectively.Evaluation of the codes against exact analytic solution and experimental data shows that the discrete transfer model gives numerical results with acceptable accuracy while the four-flux model underpredicts the heat fluxes although the gen- eral trend is reasonable.Numerical studies have been performed of two-dimensional,axisymmetric turbulent, buoyancy-controlled indoor fire.The computational results show that neglecting radiation in the simulation can cause overprediction of 500K in the maximum temperature and less uniform velocity field compared to the prediction by discrete transfer model.The four-flux method has been found to produce less uniform velocity and temperature values than discrete transfer model,but is more economic in computation.
