Dynamic Characteristics of a Squeeze Film Damper used as Rear Bearing in a Single Spool Aeronautic Gas Turbine

Vinicius da Silva Lino, Damásio Sacrini, Adilson Vitor Rodrigues, Geraldo Creci, João Carlos Menezes

Squeeze Film Damper, Aeronautic Gas Turbine, Bearings, Lubrication, Stiffness, and Damping Coefficients.

Squeeze film dampers are widely used in aeronautic gas turbines because they effectively absorb vibrations and lessen the stresses on the structural components. In this study, we calculated the stiffness and damping dynamic coefficients of a squeeze film damper with open ends and a circumferential oil-feeding groove. This squeeze film damper was used as a rear bearing in an aeronautic gas turbine designed to generate 5-kN of thrust under ISA conditions. Three different radial clearances were investigated to determine the optimal bearing design configuration for the application because the radial clearance of a squeeze film damper is a crucial element in determining its dynamic stiffness and damping coefficients. To provide superior performance and avoid issues, a rotordynamic analysis using the calculated stiffness and damping dynamic coefficients can be conducted to predict the vibratory behavior of the entire rotating assembly.

Received: 02 Dec 2022, Receive in revised form: 30 Dec 2022, Accepted: 08 Jan 2023, Available online: 15 Jan 2023

10.22161/ijaers.101.4