D形断面柱体驰振耦合气动力特性试验研究
发布时间：2018-09-12 10:08
【摘要】：覆冰导线驰振耦合气动力特性的研究是解释驰振机理的主要手段,也是开发气动抑振措施的主要依据。以常被作为模拟导线覆冰形状的D形断面为研究对象,采用静态气动力、驰振响应及耦合气动力测试风洞试验,研究分析了D形断面柱体的静态气动力特性,基于准定常假设的单自由度横风向驰振理论预测了驰振发生的风向角及临界风速,通过驰振响应及动态气动力分析,揭示D形断面驰振的气动力变化过程。结果表明:D形断面在来流与其直线侧夹角为40°左右时易发生横风向大幅振动;振动是由气流的分离状态随风向角变化引起的,其响应的主要气动力贡献也来自分离点后的尾流区域。这种对分离点的敏感表明,通过控制气流的分离点可以提供有效的抑制驰振措施。
[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 掳, 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.
【作者单位】： 河北省大型结构健康诊断与控制实验室;石家庄铁道大学土木工程学院;
【基金】：国家自然科学基金资助项目(51108280,51378323) 河北省自然科学基金资助项目(E2017210107)
【分类号】：TM752
本文编号：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 掳, 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.
【作者单位】： 河北省大型结构健康诊断与控制实验室;石家庄铁道大学土木工程学院;
【基金】：国家自然科学基金资助项目(51108280,51378323) 河北省自然科学基金资助项目(E2017210107)
【分类号】：TM752
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