THE stall flutter of steam turbine long blade influences the operation safety of the large steamturbine.Some basic assumptions have been used in steam turbine flutter study,including theassumption that the interblade ...THE stall flutter of steam turbine long blade influences the operation safety of the large steamturbine.Some basic assumptions have been used in steam turbine flutter study,including theassumption that the interblade phase angle distribution along the blade row is constant.Thisassumption simplifies the computation of unsteady flow around oscillating cascade,because展开更多
为研究风轮叶片参数对大型风力机叶片气弹稳定性的影响,以国际能源署(International Energy Agency, IEA)公开的15 MW级风力机为研究对象,采用基于叶素动量理论、几何精确梁理论的气动弹性耦合动力学模型,研究风力机的叶片弹性中心、剪...为研究风轮叶片参数对大型风力机叶片气弹稳定性的影响,以国际能源署(International Energy Agency, IEA)公开的15 MW级风力机为研究对象,采用基于叶素动量理论、几何精确梁理论的气动弹性耦合动力学模型,研究风力机的叶片弹性中心、剪切中心、质量中心的分布以及叶片挥舞刚度、摆振刚度、扭转刚度的大小对气弹稳定性的影响。结果表明:叶片质心位置是影响气弹稳定性的关键因素,质心向翼型的前缘移动可大幅提高气弹稳定性,扭转刚度与临界颤振转速呈近似线性的正相关关系,剪心位置、挥舞刚度对叶片临界颤振转速有小幅影响,而弹心位置和摆振刚度对气弹稳定性几乎没有影响。展开更多
文摘THE stall flutter of steam turbine long blade influences the operation safety of the large steamturbine.Some basic assumptions have been used in steam turbine flutter study,including theassumption that the interblade phase angle distribution along the blade row is constant.Thisassumption simplifies the computation of unsteady flow around oscillating cascade,because
文摘为研究风轮叶片参数对大型风力机叶片气弹稳定性的影响,以国际能源署(International Energy Agency, IEA)公开的15 MW级风力机为研究对象,采用基于叶素动量理论、几何精确梁理论的气动弹性耦合动力学模型,研究风力机的叶片弹性中心、剪切中心、质量中心的分布以及叶片挥舞刚度、摆振刚度、扭转刚度的大小对气弹稳定性的影响。结果表明:叶片质心位置是影响气弹稳定性的关键因素,质心向翼型的前缘移动可大幅提高气弹稳定性,扭转刚度与临界颤振转速呈近似线性的正相关关系,剪心位置、挥舞刚度对叶片临界颤振转速有小幅影响,而弹心位置和摆振刚度对气弹稳定性几乎没有影响。
