Mathematical Modelling And Performance Calculation: Screw Compressors-

[ R_v = \fracV_sucV_dis ]

If chocked (sonic flow at throat), the pressure ratio is replaced by the critical pressure ratio. [ R_v = \fracV_sucV_dis ] If chocked (sonic

[ V_th = z_1 \cdot A_flow \cdot L ]

[ \dotm actual = \dotm theoretical - \dotm_leak,total ] From the thermodynamic model, the following performance parameters are extracted. 4.1 Volumetric Efficiency [ \eta_v = \frac\dotm actual \cdot v suc \cdot n_rotorV_th ] total ] From the thermodynamic model