Abstract:

In view of the idea that bionic non-smooth surface can reduce drag, different sizes and shapes of grooves are arranged on the surface of high-speed rotors. With RNG k-ε turbulence model, the 3D flow field of the models has been simulated to calculate the drag coefficients of both smooth and non-smooth rotors respectively. In comparison with the wall shear stress of rotors and velocity field, the result shows that high-speed rotors with tiny non-smooth groove can reduce drag force of high-speed air flow on the wall of rotors, thereby decreasing energy consumption of rotor spinning machines. In addition, both depth and shape of grooves have an influence on drag force. Compared to smooth rotors, the maximum drag reduction of triangle groove rotor, semi-circle groove rotor and the rectangle groove rotor, is up to 1.271%, 1.261%, 1.385% respectively.