接触式石墨端面密封材料磨损行为预测

Prediction for Wear Behavior of Graphite Material in End Face Seal

关键词:  航空发动机  端面密封  石墨  磨损  数值仿真

Key words:  Aero-engine  End face seal  Graphite  Wear  Numerical simulation

摘要:

以航空发动机两种典型石墨端面密封材料配副M234-9Cr18Mo和M234AO-9Cr18Mo为研究对象，开展干摩擦和油润滑条件下石墨端面密封材料磨损行为预测方法研究。采用Archard磨损模型并考虑材料磨损对润滑接触行为的影响，建立干摩擦、油润滑状态下石墨密封材料磨损量化模型，提出一种基于半解析的数值仿真方法，针对不同材料及工况条件下磨损行为开展数值仿真分析。结果表明：所发展的磨损模型及仿真方法具有较好计算精度，试验与仿真结果对比显示，最大磨损深度误差小于10%；材料、pv值、润滑条件对石墨端面密封材料磨损行为具有显著影响，M234比M234AO具有更好的耐磨性能，增加pv值会导致石墨密封材料的磨损更严重，油润滑比干摩擦更有利于降低石墨材料磨损深度，最大磨损深度降低约28.5%。

Abstract:

A numerical simulation method was proposed to predict the wear behavior of graphite end face seal materials in aero-engine under both dry-sliding condition and oil lubrication condition. M234-9Cr18Mo and M234AO-9Cr18Mo were selected as the typical experimental materials. The wear model was built based on the Archard model and the influence of material wear on lubrication behavior contact was considered， which was able to quantitatively predict the graphite’s wear behavior under dry and oil lubrication. A semi-analytical numerical simulation method was developed. A series of numerical simulations of wear predictions for different graphite materials were conducted under various working conditions by using the proposed method. The accuracy of wear prediction method was evaluated by the comparison of experimental data and simulation results. The results show that the values of simulated maximal wear depth agree well with the experimental data and the error is less than 10%. The wear behavior of graphite end face seal is influenced by such factors significantly， including material， pv value and lubrication condition. Compared with M234AO-9Cr18Mo， M234-9Cr18Mo has a better anti-wear performance. The sever wear of graphite is observed under high pv value. The oil lubrication is more conductive to lower wear depth of graphite end face seal than the dry-sliding， and the maximal wear depth for oil lubrication reduces approximately 28.5%.