多參數(shù)影響下開洞口煤倉表面風壓系數(shù)擬合研究
發(fā)布時間：2019-05-17 12:27
【摘要】：在實際結(jié)構(gòu)中球形儲煤倉的網(wǎng)殼結(jié)構(gòu)都與輸煤棧橋相連,棧橋洞口的存在會使網(wǎng)殼表面風荷載變化更為復雜,我國現(xiàn)行規(guī)范中對網(wǎng)殼上開洞口的特殊建筑風壓沒有明確的設(shè)計規(guī)定。基于此,運用FLUENT軟件和計算流體力學(CFD),采用SST?-?湍流模型,對開洞煤倉球面網(wǎng)殼的風荷載分布規(guī)律進行了數(shù)值風洞計算。分析了當矢跨比、來流風速、網(wǎng)殼高度、風向角、球面半徑、棧橋洞口尺寸改變的情況下網(wǎng)殼表面的風壓系數(shù)分布規(guī)律。分析結(jié)果表明,矢跨比、風向角、球面半徑對網(wǎng)殼表面風壓分布有較大影響。棧橋洞口尺寸對網(wǎng)殼表面局部的風壓系數(shù)有較大影響,針對此種特殊結(jié)構(gòu)推導出了計算風壓系數(shù)的擬合公式,并將公式應用到已有的風洞實驗結(jié)果,發(fā)現(xiàn)風壓分布變化規(guī)律大致相同,擬合情況較好。
[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.
【作者單位】： 遼寧工程技術(shù)大學力學與工程學院;
【分類號】：TD264.4;TD722
，
本文編號：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.
【作者單位】： 遼寧工程技術(shù)大學力學與工程學院;
【分類號】：TD264.4;TD722
，
本文編號：2479087
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