SIMULATION & DEVELOPMENT OF HIGHER EER FOR OIL FLOODED ROTARY SCREW COMPRESSOR

SIMULATION & DEVELOPMENT OF HIGHER EER FOR OIL FLOODED ROTARY SCREW COMPRESSOR

Shashank Kumar¹, Yogesh Mishra² , Ramnarayan Sahu³

¹Research Scholar Master of Technology (MD&R) Department of Mechanical Engineering, NIIST, Bhopal

²Professor and Head Department of Mechanical Engineering, NIIST, Bhopal

³ Assistant Professor Department of Mechanical Engineering, NIIST, Bhopal

Abstract

The oil-flooded rotary screw compressors (OFRSC) are commonly consumed for industrial, commercial gas processing and refrigeration. An enhanced design for advanced performance demands minimum possible energy losses. The need of competent OFRSC can be achieved through the superior air-oil separation efficiency and reduced pressure dip slump. The work presented here is performed using the Computational Fluid Dynamics (CFD) simulation for predicting and evaluating the operation of Liquid-Gas separation and the pressure slump characteristic in a tangential inlet cyclone. The Air-Oil separator (AOS), which is part of oil flooded rotary screw compressor, is modelled and CFD simulation is performed with the help of ANSYS Fluent. For the simulation of AOS finite volume discretization method is used. In case of highly swirling flow, the Reynolds Stress Model is used for better predictions. The results produced by this simulation are compared with existing AOS whose experiment data is collected. After validating the existing system, system is modified. The modification is done on geometrical parameter. CFD of the modified system is performed to predict flow behaviour, primary separation efficiency and pressure drop. The predicted values from CFD modelling are compared with experimental data. For different geometrical parameter, equation of primary separation efficiency in terms of pressure drop and angular position is formulated which is key outcome of this work.

Keywords: CFD, OFRSH, AOS, Simulation, Liquid-Gas, Compression