Video shows the results from a Transient Conjugate Heat Transfer simulation of an Oil-free Twin Screw Compressor. SCORG grid generator was used for the deforming fluid domain and SCORG CAD export utility was used for the rotor geometry of the solid components. The temperature of the air during compression from 1.0 bar to 2.5 bar reaches up to 130 C. Following metal conduction, the temperature in the rotors is in the range of 60 – 90 C. The numerical time scale of solid conduction was modified in the Ansys CFX solver to accelerate metal conduction, achieving steady-state temperature results within a reasonable number of gas flow cycles.

Simulation is part of the SECRET project. Howden and City Compressors at City, University of London collaborate on a 5-year project – Smart Efficient Compression, Reliability and Energy Targets (SECRET) which is supported by an award from Royal Academy of Engineering. The aim is to develop novel energy-efficient compression technologies.

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