A review of closed valve head prediction methods for centrifugal pumps

Dyson, G.

doi:10.1243/09576500260251174

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…In equation (2), the mechanical losses of the water pump mainly include the (1) friction loss in the stuffing box, (2) friction loss in the bearings and (3) disc friction loss. Equation (3) can be expressed as follows, according to the literature, 14–17 sine and cosine theorems, and circumferential velocity formula …”

Section: Methodsmentioning

confidence: 99%

Operating characteristics of the variable frequency speed-regulating system for a single pump in a closed system

Song

Zhao

2016

Building Services Engineering Research and Technology

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This study experimentally investigated the operating characteristics of the variable frequency speed-regulating system of a water pump in a closed system. The test data for the variable frequency water pump under various conditions were obtained by changing the water pump frequency and the opening setting of a regulator valve in the system. This study revealed that the total power ratio of the water pump system before and after the frequency adjustment did not exhibit cubic correlations with its rotational speed ratio as defined by the affinity law, especially in areas other than the high-efficiency area of pump operation. The equations that express the correlations between the frequency ratio and the total power ratio under the full range of operating conditions were obtained in this study by using the data fitting method. The test confirmed that the fitted characteristic equations had a higher precision and a wider scope of applicability than the existing equations when the water pump, motor, and variable frequency drive were considered as a whole. Practical application: The variable frequency speed-regulating system of a water pump was used in cooling, cooled and heating systems. However, the water pump power was calculated by the standard cube law, and its energy-saving potential was exaggerated. This study revealed a new energy model of a water pump system that can more accurately calculate the total power of the variable frequency water pump in practical engineering.

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Section: Methodsmentioning

confidence: 99%

Operating characteristics of the variable frequency speed-regulating system for a single pump in a closed system

Song

Zhao

2016

Building Services Engineering Research and Technology

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“…The pump rotational speed at shut-off was considered nearly constant. Hence, according to equation (7), R d only depended on Q V . In other words, R d was changed by controlling Q V .…”

Section: Control On the Cooling Fuel Flow Ratementioning

confidence: 99%

“…where c is the head coefficient (c = 0.6720.75). 28 Equation (7) shows that R d is a function of Q V and n.…”

Section: Analysis Of Vapour Corementioning

confidence: 99%

“…6 For the conventional fuel centrifugal pump, the operating time at shut-off is so short that the temperature rise in the pump is small and can be neglected, so the problem of the temperature rise in a conventional centrifugal pump at shut-off has rarely been studied. To date, studies on the shut-off condition for a centrifugal pump have mainly focused on the shut-off head [7][8][9][10] and the shut-off power. 11 However, in the case of the afterburner fuel centrifugal pump, the problem of the high fuel temperature rise at shut-off cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

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Cooling design of an aero-engine fuel centrifugal pump at shut-off

Fan

Piao

2017

Advances in Mechanical Engineering

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Because of the problem of a high fuel temperature rise at shut-off, a conventional centrifugal pump could not be used as an aero-engine fuel pump for the afterburner fuel supply. In this study, a centrifugal pump with a cooling bypass was designed to address this problem. Experiments and numerical simulations were conducted to assess the design. The results showed that the circulation cooling achieved by a small amount of cooling fuel from a cooling bypass could effectively solve the problem. When the pump with a cooling bypass operated at shut-off, a large vapour core appeared at the centre of the impeller due to cavitation. This large vapour core reduced both the pump power consumption and the heat generated by friction, thereby greatly reducing the fuel temperature rise in the pump. Further research works showed that the radius of the vapour core was a function of the flow rate and the pump rotational speed. Moreover, the cooling fuel flow rate was regulated by the size of the nozzle hole. It is clear that a centrifugal pump with a cooling bypass overcomes the problem of the high fuel temperature rise in the pump at shut-off.

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Numerical Simulation of Low Specific Speed American Petroleum Institute Pumps in Part-Load Operation and Comparison With Test Rig Results

Benigni

Jaberg

Yeung

et al. 2012

Journal of Fluids Engineering

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A low specific speed centrifugal pump is investigated by means of numerical simulation, especially in deep part-load operation. The 3D computational fluid dynamics (CFD) model includes the front and back cavities, a 360 deg impeller and a double volute, as well as suction and pressure pipes. Stationary calculations show a strong clocking effect and lead to an overprediction of the head close to zero flow rate. A one-dimensional estimation of the head at the closed valve operation point is compared to the 3D CFD results and also a series of test rig results. In a second step, the whole head curve is calculated by a fully transient calculation using the shear stress transport–scale-adaptive simulation (SST–SAS) turbulence model. For the net positive suction head (NPSH) estimation, the histogram method is applied providing good correlation to the test rig measurement—as do the head curve and the efficiency.

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A review of closed valve head prediction methods for centrifugal pumps

Cited by 4 publications

References 4 publications

Operating characteristics of the variable frequency speed-regulating system for a single pump in a closed system

Operating characteristics of the variable frequency speed-regulating system for a single pump in a closed system

Cooling design of an aero-engine fuel centrifugal pump at shut-off

Numerical Simulation of Low Specific Speed American Petroleum Institute Pumps in Part-Load Operation and Comparison With Test Rig Results

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