Abstract—In this study, the performance of impellers with the same outlet diameter having different blade numbers for centrifugal pumps is thoroughly evaluated The impeller outlet diameter, the blade angle and the blade uumbers are the most critical parameters which affect the performance of centrifugal pumps.. The model pump has a design rotation speed of 4000 rpm and an impeller with 4,5,6,7,8,9,10,12 numbers of blades has been considered. The inner flow fields and characteristics of centrifugal pump with different blade number are simulated and predicted by using Ansys Fluent software. The simulation is steady and moving reference frame is applied to take into account the impeller-volute interaction. For each impeller, static pressure distribution, total pressure distribution and the changes in head as well as efficiencies of centrifugal pump are discussed. With the increase of blade number, the head and static pressure of the model increases, but the variable regulation of efficiency are complicated, but there are optimum values of blade number for each one.
Index Terms—Centrifugal pump, blade number, CFD, Pressure distribution, Characteristics prediction.
Sujoy Chakraborty is PG student of department of mechanical engineering at NIT Silchar, Assam, India.
K. M. Pandey is working as professor in department of mechanical engineering at NIT Silchar, Assam, India. Email: kmpandey2001@yahoo.com
Cite: S. Chakraborty and K. M. Pandey, "Numerical Studies on Effects of Blade Number Variationson Performance of Centrifugal Pumps at 4000 RPM," International Journal of Engineering and Technology vol. 3, no. 4, pp. 410-416, 2011.
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