Detailed prediction of fluid-solid coupled phenomena of turbulent flow through reed valves

International Conference on Compressors and their Systems 2019

González, I.^1 ; Naseri, A.^1 ; Rigola, J.^1 ; Pérez-Segarra, C.D.^1 ; Oliva, A.^1

Heat and Mass Transfer Technological Center (CTTC), Universitat Politècnica de Catalunya - BarcelonaTech (UPC), ESEIAAT, Colom 11, Terrassa (Barcelona)

08222, Spain^1

关键词: Coupled problems;    Discharge process;    Fluid-solid coupled;    Hermetic reciprocating compressor;    Numerical predictions;    Penalty methods;    Structural reliability;    Thermal efficiency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/604/1/012064/pdf
DOI  :  10.1088/1757-899X/604/1/012064

来源: IOP

【 摘 要 】

The operation of self-actuated valves in suction and discharge processes plays a crucial role in the thermal efficiency and structural reliability of hermetic reciprocating compressors. The present work provides a thorough description of an in-house numerical method based on a partitioned fluid-structure interaction algorithm intended to obtain high-fidelity numerical predictions and optimise valve system design. A large eddy simulation model is used for the turbulent flow, whereas a normal mode superposition assumption along with an impact penalty method is used for the reed. Under this framework, a detailed analysis of the coupled problem with a straight and tapered exit ports is carried out. Differences in effective flow area and pressure drop are found as a result of the port geometry, but also of the valve velocity.