Authors: Ahmed Kovacevic, Nikola Stosic, Ian K. Smith
Addresses: Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, UK. ' Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, UK. ' Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, UK
Abstract: Efforts are continually being made to produce screw compressors with smaller clearances in order to reduce internal leakage. However, since the compression process induces large pressure differences across the rotors and temperature rise, they deform. A reliable method of estimating the interaction between fluid flow parameters and rotor deflection is thus needed in order to minimise clearances while avoiding contact between the rotors and the casing. A 3-D mathematical procedure is presented here to generate a numerical grid comprising both solid and fluid domains. This can be used to calculate the fluid flow and compressor structural deformation simultaneously by means of a suitable commercial numerical solver. Simulation results demonstrate the effects of change in working clearances, caused by rotor deformation, on compressor performance.
Keywords: fluid–solid interaction; screw compressors; analytical grid generation; numerical simulation; internal leakage reduction; fuid flow; rotor deflection; compressor deformation; compressor performance; clearance reduction.
International Journal of Computer Applications in Technology, 2004 Vol.21 No.4, pp.148 - 158
Published online: 31 Mar 2005 *Full-text access for editors Access for subscribers Purchase this article Comment on this article