Centrifugal pumps often experience a decrease in efficiency, particularly in low flow and high-pressure conditions, which are categorized as low specific speed regions. In such cases, volumetric pumps are generally used. However, in recent years, various industries, including medical, food, and chemicals, have sought smaller and simpler structured pumps as alternatives to traditional volumetric pumps. To meet this demand, the Small Double-Rotating Single Screw Pump has been developed. This pump features a unique design that reduces friction losses by establishing a clearance of approximately 0.1 mm between the rotor and stator, as well as between the stator and casing, while maintaining the operating principle of conventional single screw pumps. In this study, three pump models with different stator stages count were used to investigate the impact of stator stage count on pump performance. Furthermore, an attempt was made to predict pump performance using dimensionless analysis.
OZAWA et al. (Wed,) studied this question.