| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Three-dimensional Meshless Steady Heat Transfer Analysis Model of Orthotropic Structure and Its Application |
| ZHANG Jianping, HU Huiyao, WANG Shusen, GONG Shuguang, LIU Tingxian
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| School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China |
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Abstract Acalculation model for three-dimensional steady heat transfer of orthotropic structure was established using Element-free Galerkin (EFG) method and the discreted EFG governing equation for 3D heat transfer of orthotropic structure was deduced. The programs were developed to analyze the steady heat transfer of orthotropic material nozzle and pressure vessel based on the proposed model. It was found that the tempe-rature field of the three-dimensional EFG method was closer to the reference solution than that of the finite element method under the same node distribution. The calculation accuracy of the proposed model was higher than the finite element method, which verified the correctness and supe-riority of the present model. In addition, the temperature field and temperature amplitude of orthotropic structures were compared with isotropic structures. The effect of three-dimensional thermal conductivity factor and three material off-angles on the heat transfer performance was studied, and the reasonable range of these parameters was provided. The results show that thermal conductivity factor and material off-angle have a great influence on the temperature field. The increase of thermal conductivity factor and material off-angle causes the maximum temperature and the temperature gradient to decrease. The direction of heat conduction rotates with material off-angle and the main direction of heat conduction is determined by the 3D thermal conductivity factor. It is recommended that the three-dimensional thermal conductivity factor be chosen in the range of 8∶1∶16—16∶1∶32, and the three material off-angles should be chosen the same value at 45—60° for orthotropic material nozzle and pressure vessel in order to obtain better heat transfer performance. The reasonable selection of thermal conductivity factor and material off-angle can enhance the heat transfer performance and reduce the temperature gradient of the orthotropic structure during the thermal structure design of three-dimensional composite materials.
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Published: 25 April 2020
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| Fund:This work was financially supported by National Natural Science Foundation of China (51975503, 51875493), Hunan Provincial Natural Science Foundation of China (2016JJ3120), Scientific Research Fund of Hunan Provincial Education Department (18C0087, 16A210). |
| About author:: Jianping Zhangreceived his Ph.D. degree in power machinery and engineering from Huazhong University of Science and Technology in 2013. He is currently an associate professor in Xiangtan University. His research interests are CAE theory and multidisciplinary structure optimization, power machinery CFD analysis and numerical heat transfer. |
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2020, Vol. 34 
