The Research On Aerodynamic Design And Numerical Simulation Of Turbo-Air-Motor's Cascade

Turbo-air-motor is a kind of air-motor, which can directly change compressed air's energy to impeller's kinetic energy. It has a big ratio of energy to capacity, outputs a high rotate speed, and its power can be altered by changing the number of nozzles. So it's always used in high rotate speed and invariable status. Research is done on aerodynamic design and numerical simulation of turbo-air-motor's cascade which is the drive of bi-rotary milling head's principal axis.Firstly, the unitary-theory calculation on the aerodynamic capability of turbo-air-motor's flowing channels is done, and aerodynamic parameters are designed, and parameters such as velocity and direction vector of inlet and outlet, loss coefficient, impeller's theoretical efficiency and flux are educed.The plane cascade of different ingoing angles (20 ~25 ) are designed, and three-dimensional models of the blade are obtained on which finite element models'construction is based.At last, numerical simulation for aerodynamic capability of turbo-air-motor's cascade by CFD software FLUENT6.3 is done, and researches are done on different parameters. Through the analysis & comparison on the simulated result, the rule of aerodynamic capability's transformation depending on different parameters (ingoing angle, blade number, blade length, radial clearance over blade tip, incidence) is discovered, and the optimal parameters combination is found out.It is found out that under the optimized parameters combination ,the moment of the cascade satisfies the design requirement and has a biggish margin.Through the numerical simulation researches on the aerodynamic capability of this high rotate speed and small size turbo-air-motor's cascade, some unique characteristics are discovered. Analyses on the characteristics will establish a solid foundation for researches on turbo-air-motor's dynamic effect.