The Design of a Family of Screw Compressors for Oil–Flooded Operation

The design of a family of efficient oil-flooded twin screw air compressors was performed at City University London for Elgi Equipments Coimbatore, India. It was carried out using a software package, which included almost every aspect of the rotor profiling and compressor thermodynamic and geometric modelling with the capacity to transmit calculated output directly into a CAD drawing system. Rack generated ‘N’ rotors of the 4/5 configuration were applied to 5 screw compressors which covered deliveries between 0.6 to 60 m/min. The compressor family is being gradually introduced by manufacturing prototypes, preproduction compressors and finally, production units. Experimental tests showed that at delivery pressures between 5 and 13 bar gauge the compressor volumetric and adiabatic efficiencies were high when compared with the best compressors currently manufactured.