Prediction Model of Power Loss of Expansion Seal Ring Based on Two-Way Fluid-Structure Interaction

To address the issue of existing power loss models' inability to accurately predict the power loss of a working seal ring, a new power loss prediction model is proposed for the expansion seal ring. A two-way fluid-structure interaction numerical calculation model, including the shaft, the oil distribution sleeve, and the expansion seal ring, is established using the ANSYS Workbench platform. Additionally, an expansion seal ring performance test system is designed and built to verify the accuracy of the numerical simulation. A power loss prediction model is constructed using the multiple linear regression method, incorporating the viscosity of the hydraulic fluid, seal differential pressure, shaft speed, and main dimensional parameters of the expansion seal ring structure. This model includes more influencing factors compared to existing models. The analysis results indicate that the relative error between the predicted values of the model and experimental values is within 9%, which meets the requirements of industrial application. The sensitivity of power loss to the influencing factors, from strong to weak, is as follows, seal differential pressure, temperature, and shaft speed. The seal differential pressure has a significant effect on the power loss of the expansion seal ring. © 2024 Xi'an Jiaotong University. All rights reserved.