二重反転形軸流翼車の回転数・食違い角制御のための一次元流管モデルの構築

Translated title of the contribution: One-dimensional Streamtube Modeling of Contra-rotating Axial Flow Rotors toward Rotational Speed and Stagger Angle Controls

Research output: Contribution to journalArticle

Abstract

<p>By applying contra-rotating rotors in axial flow pump, compact size and better cavitation performance have been achieved. However, deteriorated performance has also been observed at off-design operations, which may be possible to be improved by applying rotating speed control and adjustable blade in front and rear rotors. In order to predict performance of contra-rotating axial flow pump with rotational speed and stagger angle controls, a model has been proposed on the basis of one-dimensional streamtube theory and the blade element theory with empirical flow angle deviations. Numerical simulations by Computer Fluid Dynamics (CFD) have also been conducted to compare with results of 1D model. In various operation conditions with changes in the rotational speed and stagger angle of rotors, total head evaluated by 1D model shows good agreement with that based on CFD from 0.8<i>Q<sub>d</sub></i> to 1.2<i>Q<sub>d</sub></i>. Small discrepancies are observed in the total efficiencies predicted by 1D model and CFD from 0.8<i>Q<sub>d</sub></i> to 1.0<i>Q<sub>d</sub></i>, while significant discrepancy occurs at larger flow rates.</p>
Translated title of the contributionOne-dimensional Streamtube Modeling of Contra-rotating Axial Flow Rotors toward Rotational Speed and Stagger Angle Controls
Original languageJapanese
Pages (from-to)E22
Journal日本機械学会九州支部講演論文集
Volume2019
Issue number0
DOIs
Publication statusPublished - 2019

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