Transient Characteristics of a Centrifugal Pump During Stopping Period

Tsukamoto, Hiroshi; Matsunaga, Shigenori; Yanagawa, Hiroshi; Hata, Satoshi

doi:10.1115/1.3242594

Cited by 76 publications

(37 citation statements)

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“…For flow acceleration inertia at the transient operating conditions, the total instantaneous head includes the flow inertial head and the steady head [1]. Figure 3 shows the comparison results of the predicted pump heads in the case where the pumped media are the pure water and the gas-liquid two-phase flow, respectively.…”

Section: Pump Headmentioning

confidence: 99%

“…With the development of engineering needs, the transient performances have been deeply studied by more and more scholars in the past 30 years. Tsukamoto and Ohashi studied the transient characteristics of a centrifugal pump during the starting period by experimental study and theoretical calculation [1]. The results show that the impulsive pressure and the lag in circulation formation around impeller blades are the main reasons for the difference between dynamic and quasi-steady characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Zhang

Xiao

et al. 2014

Advances in Mechanical Engineering

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The transient performance of centrifugal pumps during the startup period has drawn more and more attention in recent years due to urgent engineering needs. In order to make certain the transient startup characteristics of a high specific-speed prototype centrifugal pump delivering the gas-liquid two-phase flow, the transient flows inside the pump are numerically simulated during the startup period using the dynamic slip region method in this paper. The results show that the difference in heads mainly focuses on the later stage of the startup period when the pump is used to transmit the pure water and the gas-liquid two-phase flow, respectively. The existence of the gas phase makes the head less than that of delivering pure water. The nondimensional head coefficient is very high at the very beginning of the startup period and then quickly drops to a stable value. The continuous variation of the attack angle at the leading edges of blades is the main reason for evolution of the internal flow field during the startup period.

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Section: Pump Headmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Zhang

Xiao

et al. 2014

Advances in Mechanical Engineering

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“…Their experimental result showed the simultaneous appearance of shroud side reverse flow at impeller inlet and outlet but their CFD results could not predict the outlet reverse flow. Tsukamoto et al [11] carried out experiment and validated the predicted results of head-flow curves, diffuser inlet pressure distribution and impeller radial forces numerically over entire flow range and they predicted back flow at small flow rate, but they did not show an exact back flow pattern along the impeller outlet.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Centrifugal Impeller for Different Viscous Liquids

Bellary

Samad

2015

International Journal of Fluid Machinery and Systems

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Oil and gas industry pumps viscous fluids and investigation of flow physics is important to understand the machine behavior to deliver such fluids. 3D numerical flow simulation and analysis for different viscous fluids at different rotational speeds of a centrifugal impeller have been reported in this paper. Reynolds-averaged Navier Stokes (RANS) equations were solved and the performance analysis was made. Standard two equation k-ε model was used for the turbulence closure of steady incompressible flow. An inlet recirculation and reverse flow in impeller passage was observed at low impeller speeds. It was also found that the higher viscosity fluids have higher recirculation which hinders the impeller performance.

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“…There have been lots of researches on transient characteristics during starting and stopping process in the past few decades. Tsukamoto et al [2,3] analyzed the transient characteristic during stopping period and startup period of a centrifugal pump by using both numerical and experimental methods. It was concluded that the curves of dimensionless flow and dimensionless head recovered to a steady level after they dropped sharply below the steady results.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Transient Flow in a Centrifugal Charging Pump during Charging Operating Process

Zhang

Yuan

et al. 2014

Advances in Mechanical Engineering

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Centrifugal charging pumps are important components of nuclear power plants and must be operated under multioperating conditions for the requirements of the system. In order to investigate the internal flow mechanism of the centrifugal charging pump during the transient transition process of charging operating from = 34 m 3 /h to = 110 m 3 /h, numerical simulation and experiment are implemented in this study. The relationship between flow rate and time is obtained from the experiment and worked as the boundary condition to accurately accomplish the numerical simulation during the transient process. External and internal characteristics under the variable operating conditions are analyzed through the transient simulation. The results show that the liquid viscosity, large scale vortexes exist in the flow passages in the beginning of the variable operating conditions, which indicates flow separation and the sudden changes in direction of velocity. As the flow rate increases gradually, the flow angles of the fluid in inlet accelerate correspondingly and the flow along the blade is more uniform, which leads to a decrease and movements of the vortexes. The contents of the current work can provide references for the design optimization and fluid control of the pump used in the transient process of variable operating conditions.

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Transient Characteristics of a Centrifugal Pump During Stopping Period

Cited by 76 publications

References 0 publications

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Numerical Analysis of Centrifugal Impeller for Different Viscous Liquids

Investigation of Transient Flow in a Centrifugal Charging Pump during Charging Operating Process

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