文章信息/Info

Title:

Research on Thermal Deformation and Stress of Aero-Engine Blade/Casing Rubbing

文章編號(hào):

1674-3962(2022)04-0296-08

作者:

劉梅軍; 董宇; 楊冠軍

（西安交通大學(xué)材料科學(xué)與工程學(xué)院 金屬材料強(qiáng)度國家重點(diǎn)實(shí)驗(yàn)室，陜西 西安 710049）

Author(s):

LIU Meijun;  DONG Yu;  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(guān)鍵詞:

熱致變形; 熱致應(yīng)力; 葉片; 機(jī)匣; 碰摩

Keywords:

thermally induced deformation;  thermally induced stress;  blade;  casing;  rubbing

分類號(hào):

V232.4；V232.6

DOI:

10.7502/j.issn.1674-3962��202008015

文獻(xiàn)標(biāo)志碼:

A

摘要:

為分析航空發(fā)動(dòng)機(jī)葉片/機(jī)匣碰摩熱致變形與應(yīng)力，基于有限元方法建立了葉片/機(jī)匣碰摩模型，研究多次碰摩下葉片/機(jī)匣的應(yīng)力、形變、溫度特征，并對(duì)碰摩熱致變形的主導(dǎo)因素進(jìn)行探究分析。研究發(fā)現(xiàn)，葉尖與機(jī)匣的碰摩會(huì)引起接觸界面摩擦升溫，不僅會(huì)改變界面溫度狀態(tài)，還將通過熱變形引發(fā)葉片/機(jī)匣產(chǎn)生附加的熱應(yīng)變和熱應(yīng)力：界面摩擦熱在改變溫度的同時(shí)還會(huì)引發(fā)機(jī)匣和葉片的熱膨脹應(yīng)變，葉片受熱后呈現(xiàn)伸長的趨勢(shì)，機(jī)匣受熱呈現(xiàn)局部向上拱起的趨勢(shì)；在葉片旋轉(zhuǎn)一周后，總體上機(jī)匣呈現(xiàn)朝向葉片拱起的趨勢(shì)，而由于機(jī)匣向內(nèi)拱起，導(dǎo)致葉尖變形不但沒有伸長，反而受機(jī)匣擠壓而縮短，同時(shí)在寬度方向上膨脹。葉片和機(jī)匣碰摩受熱后的疊加作用結(jié)果是在葉尖與機(jī)匣間產(chǎn)生附加壓應(yīng)力，同時(shí)熱致應(yīng)變應(yīng)力的產(chǎn)生主要源自于機(jī)匣摩擦熱，因此，機(jī)匣摩擦熱是引發(fā)縱向位移、縱向應(yīng)力的主要來源。

Abstract:

To analyze the blade/casing rubbing-friction process of aero-engine, a blade/casing rubbing-friction model is established based on the finite element method. The stress,deformation,temperature characteristics of blade/casing under multiple rubbing are studied, and the dominant factors of thermal deformation caused by rubbing are explored and analyzed. The rubbing-impact between blade tip and casing of aero-engine will increase the temperature of the contact interface friction, which will not only change the interface temperature state, but also cause additional thermal strain and thermal stress of blade/casing through thermal deformation. Interfacial frictional heat changes the temperature and also induces thermal expansion strain of the casing and blades. The blades show an elongation trend and the casing show a partial upward arching trend after being heated. After the blades have rotated once, the casing generally shows a tendency to arch toward the blades. However, the deformation of the blade tip due to the inward arching of the casing not only does not extend, but is compressed and shortened by the casing, and expands in the width direction at the same time. The superimposed effect of the casing and blades after being rubbed and heated results in additional compressive stress between the blade tip and the casing. At the same time, the cause of thermally induced strain stress mainly comes from the effect of friction heat in the casing. Therefore, the friction heat of the casing is the main source of longitudinal displacement and longitudinal stress.