Simulation Analysis of Fluid-structure Coupling Strength of Complex Thin-walled Shells and Experimental Testing
Based on the finite element method,For a turbocharger complex thin-walled combustion inlet shell leakage phenomenon,Using CFD fluid-solid coupling calculation method,The temperature and stress distribu-tion of the diesel engine and turbocharger test rig were simulated respectively,and experiments were conducted.The study shows that the combustion inlet shell temperature field is uniformly distributed without abrupt chan-ges,The maximum temperature of the surface of the combustion inlet shell under diesel engine operating condi-tions is 212℃,and the minimum temperature is 72℃.Under the bench test condition,the maximum tempera-ture of the surface of the combustion shell is 193.6℃,which is 18.4℃less than that of the diesel engine,and the minimum temperature of the inner cavity is 20℃.The bench test is in high agreement with the simulation,with a maximum error of about 4.3%.Stress calculations show that:combustion into the shell stress is equally distributed,diesel engine conditions,the maximum equivalent force of 176 MPa,the maximum equivalent force is less than the yield strength of the material 224MPa,the safety factor of 1.27.Under the bench test condition,the maximum stress was distributed in the combustion inlet shell cooling water flow path,with a maximum value of about 230 MPa.The maximum error between the theoretical calculated strain and the actual test strain of the combus-tion shell is 4.11%,the theoretical calculation results and the actual test results are in good agreement,and the stress calculation of the combustion shell fully meets the requirements of the engineering simulation accuracy,and the results of the study lay the theoretical calculation basis for the subsequent enhancement of the combustion shell life.
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