Abstract
The influence of the blade outlet angle on preventing overload in a submersible centrifugal pump and the pump performance characteristics were studied numerically for a low specific speed multi-stage submersible pump. The tested blade outlet angles were 16°, 20°, 24°, 28°, and 32°. The results show that the blade outlet angle significantly affects the external flow characteristics and the power curve can be controlled to prevent overload by properly reducing the blade outlet angle. Increasing the blade outlet angle significantly increases the low pressure area at the impeller inlet, which makes cavitation more likely. Therefore, β2 = 16° provides the best anti-cavitation flow field. Increasing the blade outlet angle also increases the flow separation near the blade working face, which increases the size of the axial vortex along the blade working surface, which rotates in the direction opposite to the impeller rotation and then extends towards the impeller inlet.
Highlights
Centrifugal pumps are widely used in many fields [1]
Stable operation of a pump without overload over the full head range [4] requires optimal design of the pump hydraulics. It is of great theoretical and practical significance to study the effects of different parameters on the performance and reliably of low specific speed centrifugal pumps, especially to prevent power overload [5,6]
The results show that when the outlet angle increases, the centrifugal pump performance handling viscous fluids improves
Summary
Centrifugal pumps are widely used in many fields [1]. For medium and low specific speed centrifugal pumps, the shaft power increases sharply with increasing flow rate. Stable operation of a pump without overload over the full head range [4] requires optimal design of the pump hydraulics It is of great theoretical and practical significance to study the effects of different parameters on the performance and reliably of low specific speed centrifugal pumps, especially to prevent power overload [5,6]. As one of the important impeller design parameters, the blade outlet angle has a large influence on the internal flow, the performance and the overload characteristics of pumps. This study analyzes the internal flow characteristics and the conditions that will limit overload of a low specific speed submersible pump for various blade outlet angles without changing the other geometric parameters of the impeller
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