CAJ | 학술논문

采用刚性模型进行测压试验，得到了不同雷诺数下准椭圆形覆冰导线的风压分布规律，通过对比平均风荷载、脉动风荷载及风荷载谱等参数，分析了雷诺数对风荷载以及横风向驰振稳定性的影响。当雷诺数达到临界区，与亚临界区的对应值相比，平均阻力系数下降、平均升力系数随风向角变化幅度大且在某些对称工况产生横风向平均升力系数；平均风压系数分布对风向角等参数更为敏感。旋涡脱落由亚临界区的规则脱落变为不规则脱落，周向风压相关性减弱，特征频率消失。临界区内平均升力系数急剧的下降段使得结构更易发生横风向驰振。
채용강성모형진행측압시험，득도료불동뢰낙수하준타원형복빙도선적풍압분포규률，통과대비평균풍하재、맥동풍하재급풍하재보등삼수，분석료뢰낙수대풍하재이급횡풍향치진은정성적영향。당뢰낙수체도림계구，여아림계구적대응치상비，평균조력계수하강、평균승력계수수풍향각변화폭도대차재모사대칭공황산생횡풍향평균승력계수；평균풍압계수분포대풍향각등삼수경위민감。선와탈락유아림계구적규칙탈락변위불규칙탈락，주향풍압상관성감약，특정빈솔소실。림계구내평균승력계수급극적하강단사득결구경역발생횡풍향치진。
By employing the rigid model wind pressure test,the wind loads distribution on quasi-oval shape iced conductor is obtained at different Reynolds numbers,and the effects of Reynolds number on wind loads as well as galloping stability in the direction transverse to the mean wind direction are analyzed by comparing the mean wind loads,fluctuating wind loads and wind force spectra.When the Reynolds number reaches the critical range,compared to the situa-tion at sub-critical range,the mean drag coefficients decrease,and mean lift coefficients occur at the symmetric case and severely vary with the wind direction;wind pressure coefficients are sen-sitive to the wind directions.Vortices shedding,which is supposed to be regular at sub-critical range,is irregular at critical range;the correlation of wind pressure around the cross section is weakened,and predominate frequency disappears.The steep slope of the lift coefficient versus angle of attack corresponding to Reynolds number at critical range makes the galloping in the di-rection transverse to the mean wind direction easy to happen.