多参数影响下开洞口煤仓表面风压系数拟合研究
发布时间：2019-05-17 12:27
【摘要】：在实际结构中球形储煤仓的网壳结构都与输煤栈桥相连,栈桥洞口的存在会使网壳表面风荷载变化更为复杂,我国现行规范中对网壳上开洞口的特殊建筑风压没有明确的设计规定。基于此,运用FLUENT软件和计算流体力学(CFD),采用SST?-?湍流模型,对开洞煤仓球面网壳的风荷载分布规律进行了数值风洞计算。分析了当矢跨比、来流风速、网壳高度、风向角、球面半径、栈桥洞口尺寸改变的情况下网壳表面的风压系数分布规律。分析结果表明,矢跨比、风向角、球面半径对网壳表面风压分布有较大影响。栈桥洞口尺寸对网壳表面局部的风压系数有较大影响,针对此种特殊结构推导出了计算风压系数的拟合公式,并将公式应用到已有的风洞实验结果,发现风压分布变化规律大致相同,拟合情况较好。
[Abstract]:In the actual structure, the reticulated shell structure of the spherical coal storage bunker is connected with the coal transportation trestle bridge, and the existence of the trestle entrance will make the wind load on the surface of the reticulated shell more complex. There is no clear design regulation for the special building wind pressure at the opening of the reticulated shell in the current code of our country. Based on this, SST?-? is adopted by using FLUENT software and computational fluid dynamics (CFD),. The wind load distribution of spherical reticulated shell in open hole coal bunker is calculated by numerical wind tunnel model. The distribution law of wind pressure coefficient on the surface of reticulated shell is analyzed when the ratio of rise to span, incoming wind speed, reticulated shell height, wind direction angle, spherical radius and the size of trestle hole are changed. The analysis results show that the ratio of rise to span, the angle of wind direction and the radius of sphere have great influence on the distribution of wind pressure on the surface of reticulated shell. The size of trestle entrance has great influence on the local wind pressure coefficient on the surface of reticulated shell. According to this special structure, the fitting formula for calculating wind pressure coefficient is derived, and the formula is applied to the existing wind tunnel test results. It is found that the variation law of wind pressure distribution is about the same, and the fitting situation is better.
【作者单位】： 辽宁工程技术大学力学与工程学院;
【分类号】：TD264.4;TD722
，
本文编号：2479087
[Abstract]:In the actual structure, the reticulated shell structure of the spherical coal storage bunker is connected with the coal transportation trestle bridge, and the existence of the trestle entrance will make the wind load on the surface of the reticulated shell more complex. There is no clear design regulation for the special building wind pressure at the opening of the reticulated shell in the current code of our country. Based on this, SST?-? is adopted by using FLUENT software and computational fluid dynamics (CFD),. The wind load distribution of spherical reticulated shell in open hole coal bunker is calculated by numerical wind tunnel model. The distribution law of wind pressure coefficient on the surface of reticulated shell is analyzed when the ratio of rise to span, incoming wind speed, reticulated shell height, wind direction angle, spherical radius and the size of trestle hole are changed. The analysis results show that the ratio of rise to span, the angle of wind direction and the radius of sphere have great influence on the distribution of wind pressure on the surface of reticulated shell. The size of trestle entrance has great influence on the local wind pressure coefficient on the surface of reticulated shell. According to this special structure, the fitting formula for calculating wind pressure coefficient is derived, and the formula is applied to the existing wind tunnel test results. It is found that the variation law of wind pressure distribution is about the same, and the fitting situation is better.
【作者单位】： 辽宁工程技术大学力学与工程学院;
【分类号】：TD264.4;TD722
，
本文编号：2479087
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