Theoretical and Experimental Investigation of Porous Tilting Pad Gas Bearings with Hermetic Squeeze Film Dampers Based on Multilayer Diaphragm Structure

Abstract

A novel porous tilting pad gas bearing (PTPGB) with hermetic squeeze film dampers based on multilayer diaphragm structure (MLD-HSFD) is proposed for oil-free turbomachinery. A dynamic model of MLD-HSFDs including the frequency dependence effect is presented by considering the compressibility of the damper fluid. An experimental test rig was assembled to measure the performance of MLD-HSFDs. The model predicts well the test data, including the frequency dependence of force coefficients. A comprehensive theoretical model of PTPGBs with MLD-HSFDs is proposed based on the implementation of the isothermal compressible Reynolds equation coupled to a flexible support and porous models. The effects of thickness of diaphragms thickness, bearing clearance, and supply pressure on bearing performance are discussed.

Keywords:

• Porous tilting pad gas bearings
• squeeze film dampers
• theoretical model
• dynamic characteristics.

Additional information

Funding

The authors acknowledge the financial support from the National Key Research and Development Program of China (Grant No. 2021YFF0600208), National Natural Science Foundation of China (Grant No. 52005170), and the Science and Technology Innovation Program of Hunan Province (2020RC4018).