Study on Air-Water Two-Phase Flow Behaviors in Centrifugal Pumps

离心泵气水两相流行为研究

• 批准号: 61550124
• 负责人: MINEMURA Kiyoshi
• 金额: $ 1.28万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550124/
• 关键词: Multi-Phase Flow; Centrifugal Pump; 混相流; 気液二相流; ボイド率分布; 三次元流; 有限要素法; 速度分布; 数値流体力学; 数値解析; うず巻ポンプ; ターボ機械; シミュレーション; 斜流ポンプ; 揚程損失比; 原子炉; 安全解析; 汚水処理; 曝気法

Centrifugal pumps are originally used for the treament of a single-phase liguid. A pump operating under a two-phase flow condition degrades usually its impeller work and pumping activity, and hence, every careful attensions are to be made to avoid the air entrainment. Recently, relating to the safety analysis of nuclear reactors or to the efficient utilization of sewage pumps in chemical plants, it is necessitated for pumps to work under gas-liquid mixtures, which has been promoted the researches on this subject.In this research project, a redial-flow pump was tested under air admitting conditions and investigated the mechanism of the change in the performance and the flow patterns. To predict the behavior of air-water two-phase flows in a centrifugal pump impeller, a three-dimensional numerical method is proposed based on a bubbly flow model. If it is assumed that the mixtures are homogeneous bubbly flow entrained fine bubbles against a characteristic length of the impeller channel, then the equations of motion of the mixtures are represented by those of liquid-phase and its velocity is expressed as a potential for a quasi-harmonic equation. The equations are solved by use of finite element method to obtain the velocities, and the equation of motion of an air bubble is integrated numerically in this flow field to obtain the void fraction. The results obtained show good agreement with experients within the range of bubbly flow regime.

离心泵最初用于运转单相性泵。在两阶段流量条件下运行的泵通常会降解其叶轮的工作和抽水活动，因此，要仔细调整以避免空气夹带。最近，与化学厂中核反应堆的安全分析或有效利用污水泵有关的是，泵必须在气体液体混合物下工作，这已促进了对该主题的研究。在这项研究项目中，在空气中测试了一个红流泵，并调查了性能变化和流动模式的机制。为了预测离心泵叶轮中的空气两相流动的行为，提出了基于气泡流模型的三维数值方法。如果假定混合物是均匀的气泡流动的细气泡在叶轮通道的特征长度上，那么混合物的运动方程式由液相相位的运动方程表示，其速度表达为准确的速度。 - 谐波方程。通过使用有限元方法获得速度来求解方程，并且气泡的运动方程在该流场中数值集成以获得空隙分数。获得的结果表明，在气泡流程范围内的经验良好一致。

项目成果

K.Minemura: Proc.of the 8th Conference on Fluid Machinery,Budapest.(1987)

K.Minemura：第 8 届流体机械会议记录，布达佩斯。(1987)

峯村吉泰: Trans.ASME,Townal of Turhomachinery.

Yoshiyasu Minemura：Trans.ASME，涡轮机械镇。

峯村吉泰、那波隆之: 日本機械学会論文集(B編). 54. 1378-1384 (1988)

Yoshiyasu Minemura、Takayuki Nanami：日本机械工程师学会会议录（B 版）54。1378-1384（1988 年）。

峯村吉泰: JSME International Journal.Seri'es II. 31. 615-622 (1988)

Yoshiyasu Minemura：JSME 国际杂志。系列 II 31. 615-622 (1988)

峯村吉泰: International Journal of Society of Mechanical Engineering. 31. 30-38 (1988)

Yoshiyasu Minemura：国际机械工程学会杂志 31. 30-38 (1988)。