Twin screw pumps are positive displacement machines. Two meshing screws connected by timing gears push the fluid trapped in the screw cavities axially from suction to discharge. Available steady state hydraulic models predict pump performance and axial pressure distribution in the chambers in single- and two-phase flow conditions. However, no model is available for their rotordynamics behavior. Due to the helix angle of the screw, the pressure distribution around the rotor is not balanced, giving rise to both static and dynamic lateral forces. The work presented here introduces a starting point for rotordynamic analysis of twin screw pumps. First, we show that the screw rotor's geometry can be represented by axisymmetric beam elements. Second, we extend the steady state hydraulic model to predict both the static and dynamic lateral forces resulting from the unbalanced pressure field. Finally, hydraulic forces are applied to the rotor to predict static, synchronous, and nonsynchronous responses. Predictions of the dynamic pressure were compared to measurements from the literature and were found to be in good agreement.
Rotordynamics of a Two-Phase Flow Twin Screw Pump
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received July 14, 2012; final manuscript received November 24, 2012; published online May 20, 2013. Editor: David Wisler.
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Muhammed, A. R. A., and Childs, D. W. (May 20, 2013). "Rotordynamics of a Two-Phase Flow Twin Screw Pump." ASME. J. Eng. Gas Turbines Power. June 2013; 135(6): 062502. https://doi.org/10.1115/1.4023490
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