Dynamic Forced Performance of an O-Rings Sealed Squeeze Film Damper Lubricated with a Low Supply Pressure and a Simple Method to Quantify Air Ingestion

Abstract

Contemporary squeeze film dampers (SFDs) in air breathing engines are short in length to limit weight and part count, and lubricated with a low feed pressure to reduce oil storage and pumping power. In SFDs, O-rings (ORs) restrict side leakage and increase the viscous damping while a adding a modest centering stiffness. Continuing a long-term project characterizing SFDs for aircraft engines and extending the original work in Ref. [1], the paper details measurements of the forced performance of an OR sealed damper (OR-SFD) with diameter D=127 mm, land length L=0.2 D, and radial clearance c=0.0022 D. Lubricant ISO VG 2 supplied at 0.69 bar(g) fills an upstream oil plenum and flows into the middle of the land through a single orifice configured with a check valve. Measurements of applied single-frequency dynamic loads, along with the ensuing damper displacements and accelerations serve to identify the parameters of the test structure, ORs, and SFD.