分裂导线体型系数试验研究

为研究分裂导线屏蔽效应对体型系数的影响，选取不同型号的导线进行实际导线节段模型风洞试验，分析导线截面、风速、风攻角、分裂数和流场等因素对分裂导线气动特性的影响。试验结果表明：双分裂导线体型系数在偏转临界位置前随风攻角的增大而增大，当风攻角达到临界位置以后，风攻角的增大对双分裂导线体型系数基本无影响；四分裂、六分裂和八分裂导线的体型系数随风攻角的变化呈先增大后减小的趋势，在某个角度有一个体型系数最大值；10%紊流度条件下分裂导线的体型系数均比均匀流场下的结果大10%~15%；紊流场条件下当风速为30 m/s时，试验得到的四分裂、六分裂和八分裂JL/G1A630-45导线的体型系数较设计规范中的取值分别减小了27.60%、24.38%和22.51%。

Experimental Study on Shape Coefficient of Bundle Conductors

In order to study the effects of bundle conductor’s aerodynamic interference on shape coefficient, different types conductors are chosen for model wind tunnel test of real conductor section to analyze the factors that affect the shape coefficient, including conductor cross-section, wind speed, wind attack angle, bundle number and flow field. The test result shows that the shape coefficient of double bundle conductors increases with the wind attack angle before deflection critical position. When the wind attack angle reaches the critical position, the increase of wind attack angle has no effect on the shape coefficient of double bundle conductors. The shape coefficient of 4-, 6-, and 8-bundle conductors increases first and then decreases with changing of wind attack angle, with the peak reaching at a certain angle. The bundle conductors shape coefficient under the condition of 10% turbulence intensity is larger than that in the uniform flow field by 10%~15%. In the scenario of 30 m/s wind speed under turbulence, the shape coefficient of 4-, 6-, and 8-bundle conductor JL/G1A-630/45 are respectively reduced by 27.60%, 24.38% and 22.51% compared to the value specified by design code.