在西安交通大学风洞台架上，针对２００ＭＷ高温气冷堆蒸汽发生器设计参数所建立的实验模型，研究了蒸汽发生器中螺旋管管束在横向低密度流体冲刷下的振动行为。针对发生流体弹性不稳定现象时的临界流速；不同螺旋半径上相邻管的相互影响；同一螺旋半径上、下游管的相互影响等问题作了讨论。获得的结果对高温气冷堆氦气蒸汽发生器的设计提供了依据，同时亦为螺旋管束的诱发振动理论计算和理论模型的建立提供实验依据。 In the wind tunnel test rig of Xi’an Jiaotong University, the vibration model of the spiral tube bundle in a steam generator under the scouring of transverse low-density fluid was studied for the design parameters of the 200MW HTGR steam generator. In view of the critical flow velocity when fluid elastic instability occurs, the mutual influence of adjacent tubes on different helical radii and the interaction of the upper and lower tubes on the same helix radius are discussed. The obtained results provide a basis for the design of helium steam generator for HTGR, and provide an experimental basis for theoretical calculation and theoretical model of induced vibration of helical bundle.