Aerodynamic Design And Energy Loss Of Fluid Flow For Nozzle And Vane Based On Spray Painting Air Turbine

Spray painting air turbine spindle is widely applied in coating industry which isnormally used nowadays for surface painting. The use of spray painting spindle couldincrease the surface quality such as smooth and glossy level in a large way. Played asthe main driving device for spray painting spindle, air turbine determined the workingefficiency in a large degree. This article analyzed the aerodynamic performance for airturbine as well as the structure optimizing. With the design and optimization of nozzleand vane for air turbine, improve the driving capability and decrease the energy loss,finally improve the rotating speed and energy efficiency.Nozzle acted as the supply air channel largely determined the aerodynamicperformance of vane channel, especially the structure of nozzle and the velocity ofexport air in the outside sector of nozzle. Transformation and distribution of pressureand mach number for flow field are analyzed under different working conditions andtechnical data. Design the scope of area ratio and other structure parameters to finallyachieve the demand for best export air velocity and coefficient. Set the outlet nozzleangle as the model parameter for CFX fluid simulation, through the result determine theoptimal model, at the same time, change the inflow pressure to verify the right chose ofworking conditions.The outlet nozzle angle determined the configuration of vane, the connection ofnozzle and vane affect the aerodynamic performance of air turbine. With the theoreticalanalysis and design choose the inflow angle leading edge of suction surface andpressure on the vane as the aerodynamic performance influencing parameters, analyzedaerodynamic performance, driving capability and energy loss under different profileangle. With the help of fluid simulation software analysis the design model, obtain theoptimal model. Finally compared the existed model and improved model, analysis theacting force, torque and energy loss for them, the result certified the improved model issuperior to existed one in the area of acting force and energy loss. What’s more, becauseof the acting force on the vane caused by fluid pressure field, this article also carry outthe fluid-structure coupling analysis which includes deformation and stress for the vaneand disk to discuss the responsibility of the model.With the existed relative movement between nozzle and vane, it is necessary toanalysis the aerodynamic performance result from interface with the method ofsimulation analysis software. The high rotating speed of turbine disk will cause theappearance of intensive eigenvalue which could affect the working performance of theturbine, this article use the method called ‘mismatch vane design’ to improve thisproblem. With the finite element analysis calculate power spectrum density function on root and middle of different vane design structures, and obtain the optimal designparameter which could largely decrease the vibration and noise for the turbine disk, andalso distribute energy distribution. At the end of this article, carry out the forcemeasurement experiment for nozzle and flat vane, choose different nozzle and vanemodel for compare experiment. Through the experiment, change the nozzle and vanemodel, supply air pressure and other working conditions to analysis the influence whichcaused by different structure parameters, different profile angle in suction and pressuresurface, and different working conditions on the turbine. Compared the exist model andoptimal model through the experiment, it is verified that the calculation of the airturbine is all reasonable, and the rotating speed of the improved spray painting spindleis calculated, too.