Erosion Wear Resistance Characteristics Of Desert Mesobuthus Eupeus And Its Bionic Application

Centrifugal fan is important equipment providing gas power in industrialproduction and many aspects of national life. When centrifugal fan worked in theharsh environment, the gas mixed with the solid particles can cause erosion of fanblades, greatly reducing its life and increasing its maintenance costs. Manybiologicals in nature have provided good references for us to solve engineeringproblems. In recent years, many studys of bionics have attracted more and moreattention. Methods of bionics are used in this paper to try improving anti-erosionperformance of centrifugal fan.In this paper, desert mesobuthus eupeus was used as the biological mold.Anti-erosion characteristics of it were studied. Surface morphology of it was studiedby stereomicroscope. There were seven tergum on the back of desert mesobuthuseupeus. And, width of these tergum increased from the head to the tail. And, the widthscope was：2.04～3.98mm. Connection between tergum was the V-shaped structure.Bionic V-shaped structure model was established according to this. Besides, tissueslices of its back was observed and analyzed. It was found that tissue of surface of itsback is different to tissue inner of the back. And, it was also found that there existedaction of curled up when the scorpion back was hit by particles. According to that, thebionic coupling sample which had no curvature was established. In the last, back ofthe scorpion was analyzed by method of reverse engineering. And, it was found thatthere existed radian both horizontal and vertical of its back. According to this, bioniccoupling model which has curvature is established.In this paper, anti-erosion performances of the V-shaped model, the arc-shapedmodel and the rectangle model were studied based on FLUENT software. And, modelwith the best anti-erosion performance was acquired using the method ofexperimental optimal technology. Solid particle erosion test was conducted to studyanti-erosion performance of the bionic coupling sample which has no curvature and the V-shaped sample. And, the result showed that the bionic coupling sample which had no curvature had better performance than the V-shaped one. Besides, Range analysis and regression analysis were conducted according to solid particle erosion test of the bionic coupling sample which had no curvature, the bionic coupling sample which had curvature, the V-shaped and the smooth sample. Primary and secondary factors and the optimal combination of the test were achieved according to range analysis. And, the regression equation is acquired by regression analysis: y=1.06Z12-4.24z1+3.02z2-0.184z22+4.36z3-1.17z32-6.34.The mechanism of better anti-erosion performance of bionic samples was disscussed. Firstly, mechanism of better anti-erosion performance of bionic V-shaped sample than the smooth one was discussed from perspective of gas turbulence and erosion zone division. Secondly, as for the experimental result of anti-erosion performance being:bionic no curvature coupling model>bionic curvature coupling model>bionic V-shaped structure model>smooth model was discussed from perspective of gas turbulence based on FLUENT and stress transfer and energy release based on LS-DYNA.Centrifugal fan blade was designed according to the bionic no curvature coupling model. Erosion wear morphology of bionic structure of centrifugal fan blade was studied. As for the bionic structure whose silicone plate thickness was2mm, particles deposit on back of both its pressure and suction surface. Particles deposition prevented erosion wear of materials. And, erosion wear on front of both pressure and suction surface was severer than others. As for the bionic structure whose silicone plate thickness was5mm, erosion wear on front of pressure surface of fan blades was severe because of existing of particle deposition. And, erosion wear on suction surface almost covers the whole blades. Erosion wear on back of pressure surface which near back of disk of impeller. Besides, anti-erosion tests of centrifugal fan were studied under different silicone plate thickness and bolt tightening torque. And, the result showed that erosion wear performance was the best when silicone plate thickness was2mm and the bolt tightening torque was30N-M. And, erosion wear rate was about 24mg when the erosion wear is steady.