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.

离心泵最初用于处理单相液体。在两相流条件下运行的泵，通常会降低其叶轮功和泵送活性，因此，应特别注意避免空气卷吸。近年来，由于核反应堆的安全分析或化工厂污水泵的有效利用，要求泵在气液混合介质中工作，这一问题的研究得到了很大的发展。为了预测离心泵叶轮内的气水两相流动特性，提出了一种基于泡状流模型的三维数值方法。如果它是假设的混合物是均匀的泡状流夹带着细小的气泡对叶轮通道的特征长度，然后的混合物的运动方程表示的液相和它的速度表示为一个准谐波方程的潜力。用有限元法求解该方程得到速度，并对气泡运动方程进行数值积分得到含气率。在泡状流范围内，计算结果与实验结果吻合较好。

项目成果

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

Yoshiyasu Minemura：Trans.ASME，涡轮机械镇。

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、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)。