【摘要】 针对陶瓷纤维编织密封泄漏性能研究多基于一维理论模型，无法描述密封件内部的气体渗流状态，难以支撑密封件的详细设计。开展新型陶瓷纤维编织密封的泄漏和变形行为数值仿真研究，通过建立陶瓷纤维编织密封的多孔介质渗流-应力耦合求解模型，在渗透压差的基础上，进一步量化了压缩量和填充密度等因素对泄漏量的影响规律，并对比不同截面形状的密封结构的密封性能。结果表明：泄漏量随填充密度和压缩量的增大呈线性减小，在10 kPa渗透压差下，填充密度从0.15 g/cm~3提高到0.20 g/cm~3,泄漏量降低18.39%,压缩量从1 mm变为2 mm,泄漏量降低29%。接近方形截面的密封结构比圆形截面密封结构的密封性能更好，在0.25 MPa渗透压差下，R=1 mm的近似方形编织截面密封件的泄漏量比R=5 mm的圆形编织截面密封件的泄漏量低44%。研究结果可为陶瓷纤维编织密封在变几何涡轮上的应用提供理论及方法支撑。更多还原

【Abstract】 Research on the leakage performance of ceramic fiber woven seals is mostly based on one-dimensional theoretical models, which cannot describe the gas seepage state inside the seal, making it difficult to support the detailed design of the seal.The numerical simulation study on leakage and deformation behavior of new ceramic fiber braided seal was carried out.By establishing porous media hydro-mechanical coupling solution model of ceramic fiber braided seal, on the basis of osmotic pressure difference, the effect of compression and filling density on leakage was further quantified, and the sealing properties of different section shapes were compared.The results show that the leakage decreases linearly with the increase of filling density and compression amount.Under the osmotic pressure difference of 10 kPa, as the filling density increases from 0.15 g/cm~3 to 0.20 g/cm~3,the leakage decreases by 18.39%.As the compression changes from 1 mm to 2 mm, the leakage is reduced by 29%.In addition, the sealing structure close to the square section has better sealing performance than the circular section sealing structure.Under the osmotic pressure difference of 0.25 MPa, the leakage of approximately square braided section seals with R=1 mm is 44% lower than that of circular braided section seals with R=5 mm.This study can provide theoretical and method support for the application of ceramic fiber braided seal in variable geometry turbines.更多还原