Performance Evaluation and Dimensional Analysis of Multistage Helicoaxial Pump for Two-Phase Flow

Patil, Abhay; Gudigopuram, Sujan R.; Ayyildiz, Burak; Delgado, Adolfo; Morrison, Gerald L.

doi:10.3390/ijtpp4030022

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…No matter if the speed of rotation n or the angular velocity ω is taken into account in accomplishing the calculations, the pressure (head) and flow rate of a turbo machine are always set to be dimensionless parameters being proportional to p n 2 D 2 and Q nD 3 [22][23][24][25][26][27]. The authors in [28] suggest newly established equations for determining the coefficients of flow rate and pressure of multistage helico-axial pumps, working with two-phase mixtures of air and water, as a function of the gas void fraction.…”

Section: Literature Reviewmentioning

confidence: 99%

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Analyzing the Energy Efficiency of Fan Systems by Using the Dimensional Analysis (DA) Method

et al. 2020

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This work represents a method for investigating the energy efficiency of fan systems used to transport fluids. Applying the methods of dimensional analysis (DA) enables establishing five dimensionless complexes ( π criteria), including some basic parameters having impacts on the consumed energy used for the transportation of a unit quantity of air. The proposed criterion π 1 includes the specific energy consumption e v (specific fan power SFP), and is used for the quantitative evaluation of the energy effectiveness of the fluid transportation. This criterion also includes the main geometric size of the pipe system (network) and the gas properties. The criterion π 3 indicates the impact of the applied method of flow rate regulation on the effective energy use of fan systems. This criterion includes parameters characterizing the selected method of flow rate regulation: speed ( n ) for using the frequency method and the referred length ( L T P ) of the pipe system for using the throttle method. The established (proposed) dimensionless parameters are used to study a concrete fan system. The obtained results concerning the evaluation of the impact of the two most used methods of flow rate regulation (frequency and throttle), as well as the density variation as a result of the temperature change, on the effective energy use are graphically presented: π 1 = f ( π 3 ) .

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Section: Literature Reviewmentioning

confidence: 99%

“…The fan system's total coefficient of efficiency is also a constant, i.e., η is a constant. These two parameters are determined by using Equations (19) and (28), involving the obtained before regulation system output flow rate.…”

Section: Frequency Regulation Of the Flow Ratementioning

confidence: 99%

Analyzing the Energy Efficiency of Fan Systems by Using the Dimensional Analysis (DA) Method

et al. 2020

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“…In gas-liquid two-phase operation, the internal flow of the pump during gas-liquid two-phase operation is extremely unstable, leading to the decrease of its head and efficiency, which affects the normal operation and service life of the pump [13][14][15]. Scholars have found that the flow pattern transition caused by the evolution of bubbles in the flow field is closely related to the operating characteristics of mixed transport pumps, and the gas pockets in the flow field are the direct cause of the onset of surging.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the presence of blade tip clearance, the internal two-phase flow and pressure surging mechanism in a semi-open mixed flow gas-liquid two-phase flow pump are more complicated. However, some studies have pointed out that at high IGVF conditions, the leakage flow in the blade tip clearance can help improve its pressurization ability.In gas-liquid two-phase operation, the internal flow of the pump during gas-liquid two-phase operation is extremely unstable, leading to the decrease of its head and efficiency, which affects the normal operation and service life of the pump[13][14][15]. Scholars have found that the flow pattern transition caused by the evolution of bubbles in the flow field is closely related to the operating characteristics of mixed transport pumps, and the gas pockets in the flow field are the direct cause of the onset of surging.…”

mentioning

confidence: 99%

Investigation on the operation and gas-liquid two phase flow characteristics of vane type deep-sea pump

Luo,

Yan,

Feng

et al. 2024

J. Phys.: Conf. Ser.

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The development of oil and gas resources towards the deep sea is an inevitable trend in international energy development. Due to its advantages of high production and transportation efficiency, good flow safety and low investment cost, oil and gas mixed transportation technology has become the preferred technology for deep-sea oil and gas production and transportation system. The core device of the oil-gas mixed transportation system is the gas-liquid two-phase flow pump. Under the gas-liquid two-phase condition, the pressure surging will occur with the increase of the inlet gas volume fraction (IGVF) in the pump. At this time, the pressurization capacity of the pump decreases significantly, accompanied by violent vibration, resulting in extremely unstable operation. To solve this problem, the numerical simulation and experiment of the two-phase operation characteristics of a centrifugal pump and a semi-open mixed-flow pump were carried out in this study. The influence of operating parameters on its pressurization capacity was clarified, and the internal gas-liquid distribution was visually tested, revealing the distribution and its spatiotemporal evolution of gas-phase in the impeller. Finally, the unsteady characteristics of pressure surging were analyzed in detail.

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“…The multi-stage centrifugal pump needs to operate under different inlet gas volume fraction (IGVF) conditions, as the volume fraction of oil and gas always changes during crude oil production and transportation. At low IGVF conditions, the pump has a higher head and efficiency, but under high IGVF conditions, its pressurization capacity drops sharply or it even stops working, which seriously endangers the continuity and safety of industrial production [3]. Therefore, it is of great significance to carry out an investigation on gas-liquid two-phase flow in a multistage centrifugal pump and improve its performance at IGVF conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Bubble Distribution of a Multistage Centrifugal Pump Based on a Population Balance Model

et al. 2020

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This work aimed to study the bubble distribution in a multiphase pump. A Euler-Euler inhomogeneous two-phase flow model coupled with a discrete particle population balance model (PBM) was used to simulate the whole flow channel of a three-stage gas-liquid two-phase centrifugal pump. Comparison of the computational fluid dynamic (CFD) simulation results with experimental data shows that the model can accurately predict the performance of the pump under various operating conditions. In addition, the liquid phase velocity distribution, gas-phase distribution, and pressure distribution of the second stage impeller at a 0.5 span of blade height under three typical working conditions were compared. Results show that the region with high local gas volume fraction (LGVF) mainly appears on the suction surface (SS) of the blade. With the increase in inlet gas volume fraction (IGVF), vortices and low velocity recirculation regions are generated at the impeller outlet and SS of the blade, the area with high LGVF increases, and gas–liquid separation occurs at the SS of the blade. The liquid phase flows out of the impeller at high velocity along the pressure surface of the blade, and the limited pressurization of fluid mainly happens at the impeller outlet. The average bubble size at the impeller outlet is the smallest while that at the impeller inlet is the largest. Under low IGVF conditions, bubbles tend to break into smaller ones, and the broken bubbles mainly concentrate at the blade pressure surface (PS) and the impeller outlet. Bubbles tend to coalesce into larger ones under high IGVF conditions. With the increase in IGVF, the bubble aggregation zone diffuses from the blade SS to the PS.

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Performance Evaluation and Dimensional Analysis of Multistage Helicoaxial Pump for Two-Phase Flow

Cited by 8 publications

References 22 publications

Analyzing the Energy Efficiency of Fan Systems by Using the Dimensional Analysis (DA) Method

Analyzing the Energy Efficiency of Fan Systems by Using the Dimensional Analysis (DA) Method

Investigation on the operation and gas-liquid two phase flow characteristics of vane type deep-sea pump

Numerical Investigation on Bubble Distribution of a Multistage Centrifugal Pump Based on a Population Balance Model

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