Research And Optimization Of Working Performance Of Three-blade Roots-type Power Machine

With the continuous development of society,waste energy and waste materials have increased,and most of the waste energy and waste materials still contain considerable renewable energy.In response to the development concept of green energy leading the transformation of the energy industry,and aiming at the difficult recovery of existing low-temperature waste heat steam(The pressure is less than 0.8 Mpa and the temperature is lower than 230℃),the research group have put forward a new type of device,which is named the new Roots-type power generation.The subject comes from the school-enterprise cooperation project,and through continuous analysis and improvement of the parameters of the Roots-type generator,its performance has improved.First of all,this paper analyzes the current research status of the Roots-type generator at home and abroad in recent years.Secondly,the basic composition of the Roots-type generator set and the detailed composition and working principle of the Roots-type generator are studied and analyzed,and then the main performance index of the Roots-type generator and its theoretical calculation method are analyzed and determined,and the core optimization direction of the Roots-type generator is established.Thirdly,based on the core optimization direction of the Roots-type generator,thinking of improving the overall efficiency,smooth feasibility and reducing noise pollution as the ultimate goal,three-leaf Roots-type generator with twisted leaves is deeply researched,and a new type of rotor is raised,which is arc-linear-involute-linear-arc-rolling arc shaped line,according to the meshing principle.To study and establish the objective function and analyze its mathematical model,and through continuously improving the relevant parameters,the optimal value of the total efficiency is achieved and recorded.Then adopting the global optimization algorithm to optimize the parameters of the Roots-type generator,the various working indicators of the Roots-type generator are theoretically verified and its model is established.Next,based on the FLUENT-ANSYS simulation platform,the Roots-type generator model is introduced,and the CFD technology is used to simulate the internal flow field of the generator.The feasibility of the optimized three-leaf Roots-type generator with twisted leaves is verified.By comparing the simulated cloud maps of the pressure field and the velocity field before and after optimization,the stability of the whole machine is improved after optimization.And comparing the volumetric efficiency,the results of the flow field simulation prove the theoretical analysis results.Finally,the test platform of the power generation unit is built for testing.And through the test,the output torque and flow rate of the Roots-type power machine at different speeds are measured,and the experimental data is recorded and plotted,which verifies the correctness of the numerical simulation.And through the improvement of the parameter values and curve trend before and after optimization,it shows that the optimized Roots-type power generation device has better working performance,and verifies the correctness of the direction and optimization of the Roots-type power generation device.The research and design of the Roots-type power generation device can provide a good platform for low-temperature waste heat steam recovery,and has certain reference value for the research progress in the field of waste energy renewable.