D形斷面柱體馳振耦合氣動(dòng)力特性試驗(yàn)研究
發(fā)布時(shí)間：2018-09-12 10:08
【摘要】：覆冰導(dǎo)線馳振耦合氣動(dòng)力特性的研究是解釋馳振機(jī)理的主要手段,也是開發(fā)氣動(dòng)抑振措施的主要依據(jù)。以常被作為模擬導(dǎo)線覆冰形狀的D形斷面為研究對(duì)象,采用靜態(tài)氣動(dòng)力、馳振響應(yīng)及耦合氣動(dòng)力測試風(fēng)洞試驗(yàn),研究分析了D形斷面柱體的靜態(tài)氣動(dòng)力特性,基于準(zhǔn)定常假設(shè)的單自由度橫風(fēng)向馳振理論預(yù)測了馳振發(fā)生的風(fēng)向角及臨界風(fēng)速,通過馳振響應(yīng)及動(dòng)態(tài)氣動(dòng)力分析,揭示D形斷面馳振的氣動(dòng)力變化過程。結(jié)果表明:D形斷面在來流與其直線側(cè)夾角為40°左右時(shí)易發(fā)生橫風(fēng)向大幅振動(dòng);振動(dòng)是由氣流的分離狀態(tài)隨風(fēng)向角變化引起的,其響應(yīng)的主要?dú)鈩?dòng)力貢獻(xiàn)也來自分離點(diǎn)后的尾流區(qū)域。這種對(duì)分離點(diǎn)的敏感表明,通過控制氣流的分離點(diǎn)可以提供有效的抑制馳振措施。
[Abstract]:The study of the coupled aerodynamic characteristics of ice-covered conductors is the main means to explain the mechanism of galloping vibration and the main basis for the development of pneumatic vibration suppression measures. The static aerodynamic characteristics of D shaped cross-section, which is often used to simulate the ice shape of conductors, are studied by using static aerodynamic force, galloping response and coupled aerodynamic test in wind tunnel test. Based on the quasi-steady hypothesis, the wind direction angle and critical wind speed of galloping are predicted. The aerodynamic variation process of D section galloping is revealed by means of galloping response and dynamic aerodynamic analysis. The results show that when the angle between the inlet flow and the straight side of the section is about 40 擄, the cross wind vibration is easy to occur, and the vibration is caused by the variation of the separation state of the air flow with the wind direction angle. The main aerodynamic contribution of its response also comes from the wake region behind the separation point. This sensitivity to the separation points indicates that the separation points of the air flow control can provide effective measures to suppress the galloping vibration.
【作者單位】： 河北省大型結(jié)構(gòu)健康診斷與控制實(shí)驗(yàn)室;石家莊鐵道大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51108280,51378323) 河北省自然科學(xué)基金資助項(xiàng)目(E2017210107)
【分類號(hào)】：TM752
本文編號(hào)：2238683
[Abstract]:The study of the coupled aerodynamic characteristics of ice-covered conductors is the main means to explain the mechanism of galloping vibration and the main basis for the development of pneumatic vibration suppression measures. The static aerodynamic characteristics of D shaped cross-section, which is often used to simulate the ice shape of conductors, are studied by using static aerodynamic force, galloping response and coupled aerodynamic test in wind tunnel test. Based on the quasi-steady hypothesis, the wind direction angle and critical wind speed of galloping are predicted. The aerodynamic variation process of D section galloping is revealed by means of galloping response and dynamic aerodynamic analysis. The results show that when the angle between the inlet flow and the straight side of the section is about 40 擄, the cross wind vibration is easy to occur, and the vibration is caused by the variation of the separation state of the air flow with the wind direction angle. The main aerodynamic contribution of its response also comes from the wake region behind the separation point. This sensitivity to the separation points indicates that the separation points of the air flow control can provide effective measures to suppress the galloping vibration.
【作者單位】： 河北省大型結(jié)構(gòu)健康診斷與控制實(shí)驗(yàn)室;石家莊鐵道大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51108280,51378323) 河北省自然科學(xué)基金資助項(xiàng)目(E2017210107)
【分類號(hào)】：TM752
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，本文編號(hào)：2238683
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