摩擦温度对篦齿径向裂纹形成的影响

doi:10.7527/S1000-6893.2024.31196

Abstract

Abstract:

The rapid propagation of radial cracks in the crown fin of turbine blades can endanger the safe operation of the engine. In order to clarify the influence of friction temperature on crack formation， a custom-designed high-speed friction test rig was used to conduct experimental research. The formation mechanism of radial cracks and the influence of friction temperature and convective heat transfer coefficient on crack formation were analyzed， and numerical analysis were conducted based on Abaqus’ XFEM model. Experiments indicated that radial cracks exclusively manifest when the friction temperature surpasses 200 ℃， and a fitting formula for the temperature drop curve that forms radial cracks was obtained. Numerical simulations illuminated the process of radial crack development. Specifically， no cracks were initiated below 1 068 ℃， whereas above 1 124 ℃， cracks propagated circumferentially across the top surface’s midsection under compressive stress. Within the temperature range of 1 068 ℃ to 1 124 ℃， radial cracks emerged under tensile stress conditions. Both elevated friction temperatures and convective heat transfer coefficients expedite radial crack formation， with friction temperature exerting a more pronounced influence.

Key words: crown fin, friction temperature, convective heat transfer coefficient, radial cracks, crack initiation

CLC Number:

V235

Yicheng YANG, Weihua YANG, Beixuan ZHANG, Zhiheng SONG, Zhaoguo MI. Influence of friction temperature on radial crack formation in turbine blade crown fins[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(10): 231196.

Figures/Tables 19

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工况	s/μm	u/（μm·s^-1）	工况	s/μm	u/（μm∙s^-1）
1	50	10	7	500	20
2	80	10	8	500	40
3	100	10	9	500	50
4	200	10	10	500	60
5	300	10	11	500	80
6	500	10	12	500	100

序号	T/℃	s/μm	u /（μm∙s^-1）
Ex1	200	50	10
Ex2	220	80	10
Ex3	330	100	10
Ex4	420	200	10
Ex5	500	500	50
Ex6	610	500	80

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Influence of friction temperature on radial crack formation in turbine blade crown fins

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工况	s/μm	u/（μm·s^-1）	工况	s/μm	u/（μm∙s^-1）
1	50	10	7	500	20
2	80	10	8	500	40
3	100	10	9	500	50
4	200	10	10	500	60
5	300	10	11	500	80
6	500	10	12	500	100

序号	T/℃	s/μm	u /（μm∙s^-1）
Ex1	200	50	10
Ex2	220	80	10
Ex3	330	100	10
Ex4	420	200	10
Ex5	500	500	50
Ex6	610	500	80

工况	s/μm	u/（μm·s^-1）	工况	s/μm	u/（μm∙s^-1）
1	50	10	7	500	20
2	80	10	8	500	40
3	100	10	9	500	50
4	200	10	10	500	60
5	300	10	11	500	80
6	500	10	12	500	100

序号	T/℃	s/μm	u /（μm∙s^-1）
Ex1	200	50	10
Ex2	220	80	10
Ex3	330	100	10
Ex4	420	200	10
Ex5	500	500	50
Ex6	610	500	80

工况	s/μm	u/（μm·s^-1）	工况	s/μm	u/（μm∙s^-1）
1	50	10	7	500	20
2	80	10	8	500	40
3	100	10	9	500	50
4	200	10	10	500	60
5	300	10	11	500	80
6	500	10	12	500	100

序号	T/℃	s/μm	u /（μm∙s^-1）
Ex1	200	50	10
Ex2	220	80	10
Ex3	330	100	10
Ex4	420	200	10
Ex5	500	500	50
Ex6	610	500	80