The tip leakage flow formed by the tip clearance of a semi-open centrifugal pump adversely affects the energy performance and the energy waste. A T-shaped blade is proposed to be used to improve the energy characteristics. The internal flow field is simulated via the shear stress transport turbulence model to analyze the influence of the T-shaped blade on the performance of a centrifugal pump. It is shown that with the T-shaped blade, the hydraulic loss can be reduced, the Euler head can be increased, and the external characteristics can be improved. The maximum head and efficiency improvements are 3% and 1.6%, respectively. The relative flow angle near the tip clearance of the T-shaped blade decreases, and the strength of the backflow region is remarkably weakened. The area of the high entropy production region decreases, and the trend of the upstream diffusion is restrained under the design condition. The T-shaped blade can help to inhibit the diffusion of the high entropy production region to the hub under the low flow rate condition, but the entropy production and the mixing losses at the tip clearance are slightly increased. This research provides a new method for improving the energy performance of the semi-open centrifugal pump.

半开式离心泵叶尖间隙形成的叶尖泄漏流对能源性能和能源浪费产生不利影响。建议使用 T 形叶片来改善能量特性。通过剪应力输运湍流模型模拟内部流场，分析T形叶片对离心泵性能的影响。结果表明，采用T形叶片，可以降低水力损失，增加欧拉扬程，改善外特性。最大扬程和效率改进分别为 3% 和 1.6%。T形叶片叶尖间隙附近的相对流角减小，回流区强度明显减弱。高熵产区面积减少，在设计条件下抑制了上游扩散的趋势。T形叶片在低流速条件下有助于抑制高熵产区向轮毂的扩散，但熵产和叶尖间隙处的混合损失略有增加。该研究为提高半开式离心泵的能效提供了一种新方法。