The pumping performance of a new type of turbo booster pump in the free molecular and transitional flow regimes is investigated using the direct simulation Monte Carlo (DSMC) method. The problem is modeled as a 3D channel with variable pitch and ditch depth screw grooves. A real 3D analysis in a rotating frame is proposed to simulate the flow field. Additional terms arising from the Coriolis and centripetal accelerations are formulated, and the variable soft sphere (VSS) model and no time counter (NTC) collision scheme are used. The intermolecular collisions are regarded as inelastic by applying the Larsen-Borgnakke model. Numerical results show good quantitative agreement compared with the experimental data.
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