Compressors- Mathematical Modelling And Performance Calculation ((exclusive)) — Screw

yf=xmsin(θm+θf)+ymcos(θm+θf)−asinθfy sub f equals x sub m sine open paren theta sub m plus theta sub f close paren plus y sub m cosine open paren theta sub m plus theta sub f close paren minus a sine theta sub f θmtheta sub m θftheta sub f represent the rotation angles of the respective rotors. Volume Curves

starts at a maximum during suction and decreases to a minimum at the discharge port. Aclearcap A sub c l e a r

is the flow discharge coefficient (experimentally determined, typically between 0.6 and 0.85). Aclearcap A sub c l e a r end-sub is the cross-sectional area of the clearance gap. are upstream pressure and temperature. Pdowncap P sub d o w n end-sub is the downstream pressure. is the isentropic exponent of the gas. is the isentropic exponent of the gas