Numerical analysis and experimental validation of the coupled thermal effects in swashplate type axial piston machines

作     者：Mukherjee, Swarnava Shang, Lizhi Vacca, Andrea 

作者机构：Purdue Univ Maha Fluid Power Res Ctr Lafayette IN 47905 USA 

出 版 物：《MECHANICAL SYSTEMS AND SIGNAL PROCESSING》 (机械系统与信号处理)

年 卷 期：2024年第220卷

核心收录：

学科分类：08[工学] 0802[工学-机械工程] 

主　　题：Axial piston machines Simulation Experimental validation Fluid-structure interaction Coupled heat transfer Thermal deformation Fully coupled model 

摘      要：This paper explores the significant impact of thermal effects on the performance of SwashplateType Axial Piston Machines, a crucial aspect often overlooked in current numerical analyses primarily focused on energy efficiency prediction and machine design optimization. Existing methods commonly neglect or only partially account for thermal dynamics and heat transfer within both fluid and solid domains, resulting in inaccurate power loss predictions and hindering designers ability to enhance energy efficiency and durability. To address this gap, we present a comprehensive thermal model that fully couples the thermal behavior of the entire machine. This model incorporates mass and energy conservation in displacement chambers and slipper pockets, dynamics of floating bodies, Reynolds equation, and energy conservation in lubricating interfaces. Furthermore, it considers heat transfer in floating bodies and thermoelasto-hydrodynamic effects induced by pressure and thermal deformation. Validation against experimental data demonstrates the accuracy of the model in predicting solid body temperature distribution and overall machine efficiency. By comparing machine efficiencies with an isothermal model, we highlight the critical importance of considering thermal effects. Additionally, our model offers insights into key power loss sources across various operating conditions, contributing to a deeper understanding of machine performance and aiding in future design optimizations.