碩士 / 國防大學中正理工學院 / 兵器系統工程研究所 / 92 / The effect of solar radiation on the thermal-flow field over a full-scaled warship under different cruise speeds had been investigated in present study. The CFD method is used to obtain the detailed IR patterns on the surfaces of a warship. The research parameters include the cruise speed, thermal radiation property of metal materials and the atmospheric absorption coefficient.
The three-dimensional and complicated solid model of warship is constructed by CATIA. A commercial grid-generation package, ICEM/CFD, is employed to generate the body-fitted and multi-block grid system of warship for computation. In order to simulate the complicated thermal-flow phenomena, a control-volume solver, Fluent 6.1, is used to solve the Reynolds-averaged three-dimensional Navier-Stokes governing equations. The turbulence quantities are enclosed by the standard k-ε turbulence model. The solar thermal radiation effect on the non-diffuse-gray warship is simulated by introducing the Discrete Ordinates Model. The quasi-random numbers were introduced in the calculation of radiant heat exchange between non-diffuse-gray surfaces of complex geometrical structure. Finally, the numerical data and thermal radiation flux image over the whole warship are visualized and analyzed by Tecplot and Fieldview.
Generally speaking, the surface infrared signature of warship is reduced as increasing of cruise speed from 20km/h to 50 km/h. The area-averaged radiation temperature over the surfaces of warship can be deduced as the metal surfaces were coated with the infrared suppression paint as compared with that of the original gray paint. Similar phenomena can be observed when the weather condition changes from the sunny to the partial cloudy. Besides, simulation results indicate that the area of high infrared radiation intensity is located on the main deck and bridge deck.
| Identifer | oai:union.ndltd.org:TW/092CCIT0157002 |
| Date | January 2004 |
| Creators | Kuo, Fang-Fu, 郭芳富 |
| Contributors | Miao, Jr-Ming, Tai, Chang-Hsien, 苗 志 銘, 戴 昌 賢 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 115 |
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