Preliminary Study on Ice Adhesion Stress and Strength on Solid Wall in Icing Wind Tunnel

摘要

Coupled with solid mechanics experiment method and icing wind tunnel experiment method,the ice shear adhesion strength measurement is implemented in test section of 3m×2m icing wind tunnel.Firstly,the ice shear adhesion strength test equipment is established on the basis of test section,which is used to measure the shear adhesion strength between ice and solid wall of airplane.Then the peeling of ice from solid wall is implemented by fixing outer model and stretching inner model.The computational model is also established to describe the shear peeling process.The plane elasticity equations are adopted to describe the computational model.The unstructured mesh is used to distribute the computational domain.The finite element method is utilised to discrete and solve the equation group.In view of the adaptability of different fracture mechanics criterion,the maximum shear stress criterion is adopted to judge the influence of shear stretching on the peeling of ice from solid wall.It shows that the ice shear adhesion stress will be increased along with the axial force load on the inner model.Due to the constrain of the outer model,there are two slight peaks of shear adhesion stress at two sides of adhesion interface and variation of the shear adhesion stress is slight flat in the middle of adhesion interface.The ice shear adhesion strength from the present experiment is reasonable from 0.4MPa to 1.0MPa,which is good agreement with the reference experimental results.The shear adhesion strength of glaze ice is larger that that of rime ice.The present experimental method and measurement device are reasonable.And the computational model and numerical results have been validated by the experimental results.