Abstract
To investigate the impact of chord length distribution patterns on the performance of high-specific-speed axial-flow pumps, this study selected three common chord length distribution methods. Taking a high-specific-speed axial-flow pump with a specific speed of approximately 1200 as the benchmark, the study maintained consistent specific speed and disk ratio. Based on an automatic optimization design platform, the study conducted optimization research on the impeller of axial-flow pumps with different chord length distribution patterns and compared their external characteristics and cavitation performance. The research results indicate that, compared with the original design, the impellers optimized with linear chord length distribution and linear cascade density distribution exhibit minor differences in external characteristics. The distribution pattern with reduced chord length at the blade tip can effectively enhance impeller efficiency under design flow rate and high flow rate conditions. In this distribution, the maximum chord length is located near 0.7 times the impeller diameter. However, this distribution also results in a decrease in impeller efficiency under low flow rate conditions, primarily due to increased leakage flow intensity in the blade tip clearance under low flow rates. Furthermore, under low flow rate and design flow rate conditions, the pump designed with the reduced chord length at the blade tip has a larger critical cavitation margin, whereas the opposite is true under high flow rate conditions. Nevertheless, during severe cavitation, the blade surface of the impeller with reduced chord length at the blade tip exhibits a smaller vapor bubble area, which improves pump performance under severe cavitation conditions to some extent. This study reveals the influence of different chord length distribution patterns on the performance of axial-flow pump impellers, and the results can provide reference for the optimization design of similar rotating machinery.
Key words
hydraulic machinery /
axial flow pump /
performance /
optimization design /
cavitation
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SUN Zhuangzhuang1, ZHU Yadong1, 2, CHEN Jiaqi3, TANG Fangping2, L Ning1, CHEN Songshan3.
Optimization and analysis of axial flow pump impeller performances by using different chord length distribution methods[J]. Journal of Vibration and Shock, 2025, 44(10): 97-105
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