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电力工程中,钢烟囱薄壁壳体的横风共振和空气动力失稳分析是一个十分复杂的问题.根据气动力平衡方程,结合空气动力阻尼和结构阻尼的比较,说明了坡度较小的烟囱结构不会发生弯曲驰振;另外,通过对烟囱壳体的动力特性以及烟囱不同高度处空气旋涡脱落频率的研究,说明了风力等级的不同对横风共振发生的区段具有明显的影响;最后通过数值方法研究了钢烟囱壳体的稳定性,结果表明烟囱壳体对于缺陷具有较强的敏感性,风压和工作负压作用下的钢烟囱锥壳的环向稳定性优于横风共振时壳体轴向的稳定性.上述结论对于薄壁钢烟囱结构的设计具有一定的理论意义和实用价值.
In power engineering, the analysis of transverse wind resonance and aerodynamic instability of thin-walled steel chimney shell is a very complex problem.According to the aerodynamic balance equation, the comparison of aerodynamic damping and structural damping shows that the chimney with smaller gradient In addition, the study on the dynamic characteristics of the chimney shell and the air shedding frequency at different heights of the chimney shows that the different wind levels have a significant impact on the cross-wind resonance section. Finally, The stability of the steel chimney shell was studied numerically. The results show that the chimney shell is sensitive to the defects. The circumferential stability of the steel chimney shell under wind pressure and working negative pressure is better than that of the transverse wind resonance When the axial stability of the shell.The above conclusions for the design of thin-walled steel chimney has a certain theoretical and practical value.