某型航空发动机涡轮导向叶片热障涂层可靠性分析

doi:10.7527/S1000-6893.2024.30141

Abstract

Abstract:

The reliability of the thermal barrier coating on the turbine guide blades of a certain civil aviation engine was studied， the blade surface temperature distribution model based on operating conditions， and the coating failure model based on temperature distribution were established. Moreover， the failure probability of the thermal barrier coating on the turbine guide blades at different service times and temperatures was calculated by Monte-Carlo simulation， the turbine guide blades’ service life was predicted and compared with the actual service results. The results show that the maximum failure probability of the thermal barrier coating is located at the leading edge of the turbine guide blade and the blade basin area. With 60% failure probability as the limit of complete failure， the average life of the thermal barrier coating in the leading edge region of the blade is only 3 857 h， the average life of the leaf basin region is 7 584 h， and the average life of the backside and trailing edge regions of the blade is more than 10⁴ h under the action of hot air flow. The agreement between the simulated service reliability and the actual inspection results of the turbine guided blades with the change of service time always stays above 60%， which proves that the reliability evaluation method used has credibility and practicality.

Key words: aero-engine, turbine guide vanes, thermal barrier coatings, failure analysis, reliability

CLC Number:

V232.4

Zhe WANG, Zhiping WANG, Kunying DING, Tao ZHANG, Yuanhang WANG. Reliability analysis of thermal barrier coatings on turbine guide vanes of a certain type of aero-engine[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(22): 430141.

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References 28

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区域	边界类型	压力/MPa	温度/℃	冷却气体流量/（kg·s^-1）
主流入口	压力入口	1.81	1 270
冷却入口	质量流量入口		191	0.034 7
主流出口	压力出口	1.13

参数	叶片基体	热障涂层
密度/（kg·m^-3）	7 870	3 610
泊松比	0.29	0.12
弹性模量/GPa	220	48
热膨胀系数/（10^-6 ℃^-1）	14.8	9.0
导热系数/（W·m^-1·℃^-1）	88.000	1.956

涂层	电压/V	电流/A	送粉速率/（r·min^-1）	喷涂距离/mm	喷枪移速/（mm·s^-1）	粉末颗粒直径/μm	涂层沉积厚度/μm
陶瓷层	40	820	4.0	80	300	45~75	150
粘结层	38	700	2.5	80	600	15~45	100

随机变量	均值	标准差	分布类型
h₀/μm	10	1	正态
C/（m·s^-0.25）	698.0	69.8	正态
T/℃	T_C	T_C /20	正态

随机变量	均值	标准差	分布类型
G_ic/（J·m^-2）	150	15	威布尔
E_TBC/GPa	20	2	威布尔
h/μm	200	20	正态
Δα/（10^-6·℃^-1）	4	0.4	正态
ΔT/℃	T₂-T₁	（T₂-T₁）/10	正态

Reliability analysis of thermal barrier coatings on turbine guide vanes of a certain type of aero-engine

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