- 摘 要
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(1 石家莊鐵道大學(xué)土木工程學(xué)院， 石家莊 050043；2 石家莊鐵道大學(xué)大型結(jié)構(gòu)健康診斷與控制研究所， 石家莊 050043；3 河北省大型結(jié)構(gòu)健康診斷與控制重點實驗室， 石家莊 050043）
［摘要］通過剛性模型測壓風(fēng)洞試驗對串列雙方柱在16個不同間距時的繞流進(jìn)行了詳細(xì)研究。雙方柱的中心距L與單個方柱橫斷面的邊長D之比L/D的變化范圍為1-2～12-0。試驗結(jié)果發(fā)現(xiàn)，串列雙方柱的臨界間距范圍為3-5≤(L/D)cr≤4-0。在臨界間距范圍內(nèi)，串列雙方柱的繞流具有雙穩(wěn)態(tài)特征，同一間距下，上下游方柱均會出現(xiàn)兩組明顯不同的壓力分布與氣動力。通過引入干擾因子，定量地討論了串列雙方柱的脈動壓力分布、脈動阻力和脈動升力隨L/D的變化規(guī)律。
［關(guān)鍵詞］串列雙方柱； 脈動壓力分布； 脈動阻力； 脈動升力； 風(fēng)洞試驗
中圖分類號：TU311-3文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)01-0140-05
Study on fluctuating pressure distribution and aerodynamic force of flows around two square cylinders in tandem arrangement
Yang Qun1, Zhao Huitao1, Liu Xiaobing1,2,3， Liu Qingkuan1,2,3
(1 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043， China;2 Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043， China;3 Hebei Province Key Lab of Structural Health Monitoring and Control, Shijiazhuang 050043， China)
Abstract:Flows around two square cylinders in tandem arrangement under 16 different spacings were investigated in detail through pressure-measured rigid model wind tunnel tests. The spacing ratio L/D is ranging from 1-2 to 12-0, where D is side length of single square cylinder and L is distance between centers of two square cylinders. The research results show that the critical spacing ratio L/D of two square cylinders in tandem arrangement is ranging from 3-5 to 4-0. In the critical spacing ratio, the flow is bistable. Two groups of different pressure distributions and aerodynamic forces appear in two square cylinders with the same spacing ratio. The variations of fluctuating pressure distribution, fluctuating drag force and fluctuating lift force with L/D are discussed quantitatively by the introduction of interference factor.
Keywords:two square cylinders in tandem arrangement; fluctuating pressure distribution; fluctuating drag force; fluctuating lift force; wind tunnel test
*河北省自然科學(xué)基金項目(E2018210105)，河北省高等學(xué)校科學(xué)技術(shù)研究重點項目（ZD2019118），河北省大型基礎(chǔ)設(shè)施防災(zāi)減災(zāi)協(xié)同創(chuàng)新中心資助項目。
作者簡介：楊群，博士研究生，講師，Email: quny123@126.com。
