论文部分内容阅读
薄覆冰舞动是一种常见而又难以用传统理论来解释的现象,需采用风洞试验对薄覆冰导线的气动力特性进行研究。根据某工程舞动现场调查结果,设计了3种覆冰厚度导线模型做风洞试验,利用六分量高频天平测得在2种不同流场中准椭圆形覆冰导线模型的平均气动力。通过平均气动力系数的对比分析结果,指出DenHartog系数不适合用来分析薄覆冰导线的舞动特性。在Den Hartog对导线舞动定性分析的理论基础上,提出了2个发生舞动的必要条件。通过试验结果的分析,得到薄覆冰导线可能发生驰振不稳定的风向角。
Thin ice dance is a common and difficult phenomenon to be explained by traditional theory. Wind tunnel test is needed to study the aerodynamic characteristics of thin coated ice conductor. According to the field survey results of a project galloping, three kinds of ice thickness conductor models were designed to do wind tunnel test, and the average aerodynamic force of the quasi-elliptical icing conductor model in two different flow fields was measured by six-component high-frequency balance. By comparing the results of the average aerodynamic coefficients, it is pointed out that the DenHartog coefficient is not suitable for analyzing the galloping characteristics of the thin coated ice conductor. On the basis of Den Hartog’s theory of qualitative analysis of wire dancing, two necessary conditions for dancing are proposed. Through the analysis of the test results, it is found that the wind direction angle of the thin coated ice conductor may fluctuate instability.