The improvement in the total head is stable and follows an increasing trend from the low-flow-rate region near 0.86 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\varphi }_{d}$$\end{document} φ d to the high-flow-rate region, with an increase of at least 2.89% compared to the total head of the reference model.
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Improvement in energy performance from the construction of inlet guide vane and diffuser vane geometries in an axial-flow pump.
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