Investigation of Recirculation Effects on the Formation of Vapor Bubbles in Centrifugal Pump Blades

Cavitation in pumps is known as the formation of vapor bubbles due to pressure drop and collapsing these bubbles. In some conditions, it has been observed that the formation of bubbles occurs at the pressure side of centrifugal pump blades. In this study, the formation of bubbles at the pressure side of blades has been investigated. Water is used in this study as the fluid and performance curves were depicted for different flow rates in an approximately constant speed. The results show that when a centrifugal pump works in low flow rates, a secondary flow namely recirculation starts to begin. In this condition, separation of flow increases which causes vortex formation and local pressure drop and eventually the formation of vapor bubbles starts.

Authors:

• Mohammad Taghi Shervani Tabar
• Seyyed Hojjat Majidi
• Zahra Poursharifi

Keywords:

• Cavitation
• Centrifugal pump
• Recirculation
• Vapor bubble.

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