🌀 Twin-Screw Compressor: Trapped Pocket P-V Cycle and Built-in Ratio (2D section)

2D cross-section of an oil-free twin-screw air compressor with a 4-lobe male and 6-lobe female rotor, the trapped pocket and its pressure-volume cycle. Set speed, inlet valve, discharge pressure, built-in volume ratio and rotor clearance and watch under- and over-compression, volumetric efficiency, flow and shaft power. Same 3:2 rotor ratio and speed and inlet controls as the 3D page, with four in-page numerical checks.