Characteristics of Centrifugal Pumps Handling Air-water Mixtures and Size of Air Bubbles in Pump Impellers

Minemura, Kiyoshi; Murakami, Mitsukiyo; Katagiri, Hidenori

doi:10.1299/jsme1958.28.2310

Cited by 37 publications

(22 citation statements)

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“…Compared to existing experiments such as presented in Minemura et al,(1985) paper, it can be pointed out that the head coefficient ratio remains at a quite high level for the present pump (even for IAVF=10%, with a small decrease of 5~6%) taking into account measurement accuracy. For higher values of IAVF (between 8 and 10%), the present experimental results do not follow the model proposed by Minemura et al(1985) and are close to the initial Furuya (1985)'s model. In fact, the flow coefficient is an important parameter to deal with.…”

Section: Single Phase Pump Characteristicscontrasting

confidence: 51%

“…A two-phase semi-empirical approach was first developed by Mikielewicz et al (1978) for a given specific speed type of centrifugal pumps. Several one dimensional models based on homogenous gas-liquid mixture have also been proposed by Minemura et al (1985Minemura et al ( , 1995, Furuya et al (1985), Clarke and Noghrehkar (1995). These models can be considered to be valid for low values of void fraction (max.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Air-water two-phase flow experimental and numerical analysis in a low specific speed centrifugal pump

Bois

Zhang

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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The paper presents experimental and numerical investigations performed on a single stage, single-suction, horizontal-orientated centrifugal pump in air-water two-phase non condensable flow conditions. Experimental test loop allows performing controlled values of air void fraction for different water flow rates for a several rotational speeds. Global pump heads and efficiencies are obtained for several inlet air void fraction values at different rotating speeds up to pump performance breakdown. Similarity laws under two-phase flow condition are investigated at three selected rotating speeds. Numerical calculations are also performed using URANS approach including k-e turbulence and inhomogeneous two-phase models for nominal rotational speed, the results of which are used to understand some specific experimental results.

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Section: Single Phase Pump Characteristicscontrasting

confidence: 51%

mentioning

confidence: 99%

Air-water two-phase flow experimental and numerical analysis in a low specific speed centrifugal pump

Bois

Zhang

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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show abstract

“…Furuya et al [13] evaluated 1D loss including bubble drag force. Minemura et al [14] introduces the effect of slippage between the two phases and proposes an extended formulation, using a two-fluid model under the assumption of rather homogeneous gas-liquid mixture. Based on the model proposed by Sachdeva et al [15], Sun [16] proposed an improved new gas-liquid model using a stratified assumption and new drag correlations.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow Characteristics of Centrifugal Pump under Air-water Inflow

Si¹,

He²,

Bois³

et al. 2019

IJFMS

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A two-phase liquid pumping test ring is built to study the flow induced characteristics of centrifugal pump under the air-water flow working condition. Pump performances are measured under different flow rates and different inlet air void fraction (a). Pressure pulsation signal spectrums and their probability density maps are also recorded. The calculations, using URANS k-epsilon turbulence model combined with the Euler-Euler inhomogeneous two-phase model, are also performed to obtain inner flow structure inside the impeller and volute channels under different air-water conditions in order to understand the pump characteristic evolutions. The results show that the performance of centrifugal pump is more sensitive to air inlet injection at low flow rates. The maximum air void fraction of model pump could reach 10% when the pump operates at the highest efficiency point, and the performance drops sharply when the air void fraction is more than 8%. The dominant frequency of pump outlet pressure pulsation is still at the blade passing frequency even under two-phase condition. Frequency amplitude increases with the increase of a. The greater the a, the more low frequency appears in broadband characteristics. With the increase of a, the probability density amplitude of pressure pulsation decreases gradually, and its span becomes gradually wider as well. Comparisons between numerical local results, experimental unsteady pressure can explain part of the phenomena that are found in the present paper.

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“…For a given pump geometry and increasing value of void gas fraction, the head can be totally lost, the consequence of which can result in huge system instabilities and pump degradations. Murakami et al [1974a], Minemura et al [1985] have proposed prediction methods for the two-phase flow performances on axial and centrifugal type of pumps in order to evaluate existing experimental measurement results with some visualization technique as well. A non-exhaustive list of important published works is proposed in Si et al paper [2017].…”

Section: Introductionmentioning

confidence: 99%

Investigation on centrifugal pump performance degradation under air-water inlet two-phase flow conditions

Cui

Zhang

et al. 2018

La Houille Blanche

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In order to study the flow characteristics of centrifugal pumps when transporting the gas-liquid mixture, water and air were chosen as the working medium. Both numerical simulation and experimental tests were conducted on a centrifugal pump under different conditions of inlet air volume fraction (IAVF). The calculation used URANS k-epsilon turbulence model combined with the Euler-Euler inhomogeneous two-phase model. The air distribution and velocity streamline inside the impeller were obtained to discuss the flow characteristics of the pump. The results show that air concentration is high at the inlet pressure side of the blade, where the vortex will exist, indicating that the gas concentration have a great relationship with the vortex aggregation in the impeller passages. In the experimental works, pump performances were measured at different IAVF and compared with numerical results. Contributions to the centrifugal pump performance degradations were analyzed under different air-water inlet flow condition such as IAVF, bubble size, inlet pressure. Results show that pump performance degradation is more pronounced for low flow rates compared to high flow rates. Finally, pressure pulsation and vibration experiments of the pump model under different IAVF were also conducted. Inlet and outlet transient pressure signals under four IAVF were investigated and pressure pulsation frequency of the monitors is near the blade passing frequency at different IAVF, and when IAVF increased, the lower frequency signal is more and more obvious. Vibration signals at five measuring points were also obtained under different IAVF for various flow rates.

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Characteristics of Centrifugal Pumps Handling Air-water Mixtures and Size of Air Bubbles in Pump Impellers

Cited by 37 publications

References 0 publications

Air-water two-phase flow experimental and numerical analysis in a low specific speed centrifugal pump

Air-water two-phase flow experimental and numerical analysis in a low specific speed centrifugal pump

Experimental and Numerical Studies on Flow Characteristics of Centrifugal Pump under Air-water Inflow

Investigation on centrifugal pump performance degradation under air-water inlet two-phase flow conditions

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