为了获得更加准确的支撑刚度，采用流固耦合方法对一种燃气轮机自由动力涡轮用的悬臂式鼠笼结构阻尼器进行了刚度研究。利用控制变量法研究了有油膜与无油膜情况、油膜半径间隙（c）、油膜长度(L)、润滑油粘度(μ)以及润滑油流量(G)对鼠笼弹性支承刚度的影响。研究表明：当半径间隙小于0.25 mm时，变形量与油膜半径间隙c3成正比规律；当大于0.25 mm时，不符合该规律；鼠笼变形量与油膜长度L、润滑油粘度μ以及润滑油流量G-0.5近似成正比。

In order to obtain more accurate support stiffness,the fluid solid coupling method is used to study the stiffness of a cantilever squirrel cage structure for a gas turbine freepower turbine.The effects of oil film and nonoil film,oil film radius gap,oil film length,oil viscosity and oil flow rate on the elastic support stiffness of squirrel cage were studied by using the control variable method.It has been found that when the radius clearance is less then 0.25 mm,the deformation is proportional to the radius clearance c3 of the oil film.When the radius clearance is greater than 0.25 mm,however,it does not follow that trend. The deformation of squirrel cage is approximately proportional to the length L of the oil film,the viscosity μ of the lubricating oil and the flow rate G-0.5 of the lubricating oil.

TK47

中科院低温工程学重点实验室开放课题（CRYO20186）；陕西省重点研发计划（2018ZDXM-GY-057）