- 摘 要
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(1 石家莊鐵道大學(xué)風(fēng)工程研究中心， 石家莊 050043； 2 河北省風(fēng)工程和風(fēng)能利用工程技術(shù)創(chuàng)新中心， 石家莊 050043； 3 石家莊鐵道大學(xué)土木工程學(xué)院， 石家莊 050043)
［摘要］基于剛性模型測壓風(fēng)洞試驗，分析了0~45°范圍內(nèi)不同風(fēng)向角下方柱的氣動特性，得到了方柱的平均風(fēng)壓分布、脈動風(fēng)壓分布、平均氣動力、脈動氣動力、旋渦脫落特性和馳振穩(wěn)定性隨風(fēng)向角的變化規(guī)律。結(jié)果表明：方柱的平均阻力系數(shù)和平均升力系數(shù)隨著風(fēng)向角的增大均先減小后增大，最后趨于平穩(wěn)，在15°風(fēng)向角附近取得最小值；方柱的脈動阻力系數(shù)基本不隨風(fēng)向角的變化而變化，脈動升力系數(shù)在風(fēng)向角由5°增大到10°時急劇減??；方柱的斯托羅哈數(shù)隨著風(fēng)向角的增大呈小幅波動，在5°和15°風(fēng)向角附近分別取得極小值和極大值；0~10°為方柱的馳振不穩(wěn)定風(fēng)向角范圍。
［關(guān)鍵詞］方柱；氣動特性；風(fēng)向角；風(fēng)洞試驗
中圖分類號：TU973 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)15-0094-05
Wind tunnel test study on aerodynamic characteristics of square cylinder under different wind attack angles
LIU Xiaobing1,2,3, WU Qianyun3, SUN Yasong3
(1 Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043， China；2 Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043， China；3 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043， China)
Abstract: A rigid model pressure-measured wind tunnel test was carried out to analyze the aerodynamic characteristics of a square cylinder at different wind attack angles ranging from 0° to 45°. The changing rule of time-averaged wind pressure distribution, fluctuating wind pressure distribution, time-averaged aerodynamic force, fluctuating aerodynamic force, vortex shedding characteristic and galloping stability of a square cylinder with wind attack angles was displayed. The results show that time-averaged drag force coefficient and lift force coefficient decrease firstly, then increase, and become constant at last with increase of wind attack angle. The wind attack angle corresponding to minimum value is 15°. Fluctuating drag force coefficient change little with increase of wind attack angle. Fluctuating lift force coefficient decreases dramatically when wind attack angle changes from 5° to 10°. St changes slightly with increase of wind attack angle. The wind attack angle corresponding to maximum value and minimum value are 5° and 15°, respectively. Unstable wind attack angle of galloping ranges from 0° to 10°.
Keywords:square cylinder； aerodynamic characteristic； wind attack angle； wind tunnel test
*河北省自然科學(xué)基金項目（E2018210105），河北省高等學(xué)?？茖W(xué)技術(shù)研究項目（ZD2019118）。
作者簡介：劉小兵，博士，副教授，博士生導(dǎo)師，Email: x_b_liu@126.com。
