文章信息/Info

Title:

A Modeling Method for Ultra-Transient Behavior of Aero-Engine Blade/Case Rub-Impact

文章編號:

1674-3962(2022)05-0383-05

作者:

董宇; 劉梅軍; 楊冠軍

（西安交通大學材料科學與工程學院 金屬材料強度國家重點實驗室，陜西 西安 710049）

Author(s):

DONG Yu;  LIU Meijun;  YANG Guanjun

(State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi‘an Jiaotong University, Xi’an 710049, China)

關鍵詞:

超瞬態行為; 碰摩; 葉片; 機匣

Keywords:

ultra-transient friction; rubbing; blade; case

分類號:

V232.4；V232.6

DOI:

10.7502/j.issn.1674-3962.202007013

文獻標志碼:

A

摘要:

為了分析航空發動機葉片/機匣碰摩過程中的超瞬態摩擦熱效應，基于有限元方法建立了葉片/機匣碰摩模型，研究了單次碰摩條件下界面的微區超瞬態摩擦熱效應，并對模擬過程中空間尺寸與時間步長對模擬結果的影響進行探究分析。研究發現，由于葉片與機匣摩擦速度快、碰摩時間短，只在葉尖很小的范圍內發生超瞬態傳熱，產生的摩擦熱以分子量級進行傳遞。葉片/機匣碰摩模型建立過程中，網格尺寸劃分過大、時間步長取值過大，會導致模擬結果不能真實反應碰摩過程的微區超瞬態熱效應。為此，通過對建模過程中模型空間尺寸與時間步長的優化，得到了能夠準確反映溫度微區超瞬態特性的建模方法，闡明了網格尺寸與時間步長匹配對微區超瞬態行為的影響規律，為葉片-機匣碰摩模型的建立奠定了基礎。

Abstract:

To analyze the blade/case rub-friction process of aero-engine, a blade/case rub-friction model is established based on the finite element method, and the ultra�瞭ransient friction heat effect at the interface under a single rub is studied. The influence of grid size and time step on simulation results during rub-impact simulation is explored and analyzed. It is found that the ultra-transient heat transfer occurs only in a small range of blade tip due to the high friction speed and short rubbing time between blade and casing. At the same time, the friction heat generated by rubbing is transferred by the order of molecular size in space dimension. During model building, grid size and time step have a significant influence on simulation results. Therefore, by optimizing the grid size and time step in the modeling process, a correct modeling method that can accurately reflect the ultra-transient characteristics of the temperature micro-zone is obtained. The influence of grid size matching with time step on micro-zone super-transient behavior is clarified, which establishes the foundation for the model of blade-case rub-impact friction.