Study On Reverse Reconstruction And Characteristics Of Blades Of Flue Gas Wheel

The flue gas turbine is one of the important equipment in the energy recovery system of the catalytic cracking unit.The moving blade is an important working element of this large rotating mechanical equipment,which is in the environment of high temperature,high speed and catalytic particle impact for a long time and under a variety of loads,and is very prone to damage or even fracture and other failure problems.And the structure of the moving blade is relatively complex,presenting a space freeform shape.In the forward design process,there are problems of long lead time and high production cost.Reverse design in the innovative design can quickly meet the diverse needs and shorten the design cycle.Therefore,the use of reverse design method to obtain the accurate 3D model of the flue gas turbine blade is of great practical significance for the structural analysis,processing and manufacturing of the moving blade,as well as for reducing the development time and cost.In this work,an accurate three-dimensional model of the moving blade is constructed by the inverse design principle and measurement techniques.Stress-strain and modal analyses are carried out to verify the correctness of the moving blade model and the feasibility of inverse reconstruction.Firstly,the preliminary work of measurement is carried out for the moving blade,and the appropriate measurement method is selected to collect the point cloud data for the moving blade.Then the pre-processing of the moving blade point cloud data is done in Geomagic Studio platform.Finally,the surface reconstruction is completed in Geomagic design X platform to obtain the 3D CAD model of the moving blade,and the error comparison analysis of the reconstructed 3D model of the moving blade is carried out in Geomagic Control X platform to verify whether the reverse reconstructed3 D model meets the error requirements as the supporting evidence of the reconstructed model.Based on the structural analysis environment of ANSYS Workbench,the stressstrain analysis of the reconstructed moving blade model was carried out after setting the material properties,dividing the mesh,setting the constraints and load analysis.The results show that the maximum stress of the moving blade is within the permissible stress range of the moving blade material under normal stress,which is in line with the actual situation.Therefore,the correctness of the reconstructed model and the feasibility of the inverse modeling method are verified from the perspective of static mechanics.The reconstructed moving blade is further analyzed in the modal analysis environment of ANSYS Workbench platform to obtain the inherent frequencies and vibration patterns of the first six orders of the moving blade.The natural mode distribution of the reconstructed moving blade model is investigated,and the frequencies of high and low frequency excitation forces are analyzed and calculated,and the excitation force frequencies are compared with the obtained intrinsic frequencies.The analysis shows that the high-frequency excitation force does not have much effect on the moving blade,and the frequencies of the low-frequency excitation force are similar to the obtained fourth-order frequencies,which is in line with the actual situation,and proves the correctness of the reconstructed model and the feasibility of the inverse modeling method from the perspective of dynamics.