Mechanical properties analysis of feedback diaphragm of the double stage decompressor under fluctuating load

DOI:	10.11809/bqzbgcxb2023.10.035
Keywords:	double stage decompressor; corrugated diaphragm; stress analysis; elastic sensitive element; large deflection deformation theory
Abstract:	Aiming at studying double stage decompressor feedback diaphragm in aeronautical propulsion system under fluctuating load, the AMESim simulation model of the high pressure air path in propulsion system is established and the accuracy of the AMESim model is verified based on the test results. The fluctuating load of the double stage decompressor feedback diaphragm is obtained by the AMESim simulation model. The corrugated diaphragm governing equation by the large deflection deformation theory is used to verify the relationship between load and deflection. Fluctuating load as the boundary condition is used for the finite element analysis of the feedback diaphragm.The influence of diaphragm material, corrugation shape and size on feedback diaphragm mechanical properties is studied. The results show that stainless steel material AISI 304 has the best feedback diaphragm performance, followed by copper alloy material T52500. The circular feedback diaphragm under fluctuating load has the smallest maximum deformation and the best mechanical properties. The best mechanical property is embodied in stainless steel circular feedback diaphragm with corrugated width ranging from 1.5 mm to 2.5 mm. The results about corrugated diaphragm can be used for quantitative analysis and qualitative prediction.
Issue:	Vol. 44 No. 10 (2023)
Published:	2023-10-28
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