| As a power system,pneumatic system has the characteristics of simple structure,clean and pollution-free,but the energy conversion efficiency of pneumatic system is relatively low.In the pneumatic transmission system,the pressurized gas in the cylinder is usually discharged directly into the atmosphere after the work is done,resulting in huge energy loss.Therefore,the recovery and utilization of pressurized gas energy from cylinder is of great significance.Based on the idea of energy saving and emission reduction,a high efficiency and energy saving turbine power generation system is designed,which converts the energy of cylinder exhaust cavity into electric energy for storage and utilization.Firstly,the exhaust characteristics of the pneumatic system are analyzed,and the design scheme of the micro turbine power generation system is made,and the feasibility is analyzed.Then the micro turbine,the core component of the micro turbine power generation system,is designed.The influence law of the micro turbine structure,the flow guide form and the number of turbine blade on the output torque is studied and analyzed,and the relationship between the output torque of the micro turbine and the number of the blades is given.FLUENT is used to simulate the internal flow field of micro volute.After determining the overall structure of the micro turbine power generation system,a mathematical model based on AMESim simulation is established.The influence of different micro volute structure on the output torque is analyzed experimentally,and the validity of the theoretical model is verified.The aerodynamic loop of the additional micro turbine power generation system is tested.The motion characteristics of the piston under different working pressure and the starting and generating characteristics of the micro turbine power generation system are analyzed.Finally,the energy transfer relation is simplified,and an energy conversion efficiency evaluation method suitable for micro turbine power generation system is proposed.Based on the above analysis,the following conclusions are drawn:1)The turbine adopts NACA series,linear type nozzle,5 blades;2)The position of the inlet is set at the 8.5mm of the top of the turbine,the width of the opening is 5mm,the opening position is flat with the root of the turbine.3)The additional micro turbine power generation system on the side of the exhaust chamber has a certain influence on the original pneumatic circuit.When the micro turbine power system or the muffler is installed on the cylinder exhaust side,the cylinder chamber pressure and the piston kinematic characteristics are affected,and it can be attached to the pneumatic loop as an energy saving accessory.4)The higher the working pressure,the better the starting performance.With the increase of working pressure,the efficiency of energy conversion becomes larger. |
