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With the purpose of analyzing the pressure and deformation of the two rotors' blades of contra-rotating fan under variable speeds, the research takes the FBD5.0/2×7.5 mine contra-rotating fan as an example, establishes a 3D physical model of contra-rotating fan's entire flow passage, and adopts 3D infrared scanner to have a point cloud scan on the two rotors' blades in order to form a more concrete model. Based on the 3D physical model, the boundary conditions and assumed conditions for solving the air pressure on the blade surface are given, and the air pressure of the rotors' blades is calculated in condition of four various speed ratios based on the theory of Computational Fluid Dynamics. In addition, the deformation of the two rotors' blades is calculated and analyzed. According to the calculating results above, the correlation between deformation and rotating speed, and the maximum deformation are assured. The results provide necessary theoretical base for the safe running of contra-rotating fan.

Study on Deformation of the Two Rotors of Contra-Rotating Fan under Variable Speeds