發(fā)布時間：2018-09-12 10:08

【摘要】：覆冰導線馳振耦合氣動力特性的研究是解釋馳振機理的主要手段,也是開發(fā)氣動抑振措施的主要依據(jù)。以常被作為模擬導線覆冰形狀的D形斷面為研究對象,采用靜態(tài)氣動力、馳振響應及耦合氣動力測試風洞試驗,研究分析了D形斷面柱體的靜態(tài)氣動力特性,基于準定常假設的單自由度橫風向馳振理論預測了馳振發(fā)生的風向角及臨界風速,通過馳振響應及動態(tài)氣動力分析,揭示D形斷面馳振的氣動力變化過程。結果表明:D形斷面在來流與其直線側夾角為40°左右時易發(fā)生橫風向大幅振動;振動是由氣流的分離狀態(tài)隨風向角變化引起的,其響應的主要氣動力貢獻也來自分離點后的尾流區(qū)域。這種對分離點的敏感表明,通過控制氣流的分離點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】： 河北省大型結構健康診斷與控制實驗室;石家莊鐵道大學土木工程學院;
【基金】：國家自然科學基金資助項目(51108280,51378323) 河北省自然科學基金資助項目(E2017210107)
【分類號】：TM752

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