An investigation of the performance of a positive displacement reciprocating pump at low pressure NPSH incorporating a three phase cavitation model

Research output: Contribution to conferencePaper

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Abstract

The full cavitation [1] multiphase CFD model of a positive displacement
reciprocating pump is presented to investigate performance during the pumping cycle through 360° of the crank shaft rotation. This paper discusses the cavitation appearance and dynamics inside the pump chamber at 100kPa, 50kPa, 25kPa and 0kPa inlet gauge pressure and evaluates the Singhal et al. [1] cavitation model in conditions of incipient cavitation, partial
cavitation and full cavitation. The paper also investigates the role of pump inlet valve inertia on cavitation dynamics. The transient CFD model takes into account a three phase flow composed of water, water vapour and 15 parts per million (ppm) of non-condensable ideal gas mass fraction, and utilizes the moving mesh technique to deal with the inlet and outlet valve dynamics. A User Defined Function (UDF) is utilized to couple the pressure field and the valve force and displacement-time histories so thatthe valves are “self-actuated”. A second UDF handles the compressibility model of water which is essential for high outlet pressure and to stabilize the simulation in the situation when the valves are both closed. The paper shows the feasibility of such a complete CFD model of a PD pump, equipped with the Singhal et Al. cavitation model, and its capability to assess the rate of phase change, the efficiency loss and the prediction the valve lift history.
Original languageEnglish
Number of pages10
Publication statusPublished - 20 Jul 2014
Event11th World Congress on Computational Mechanics, WCCMXI - The Palace of Congresses of Catalonia, Barcelona, Spain
Duration: 20 Jul 201425 Jul 2014

Conference

Conference11th World Congress on Computational Mechanics, WCCMXI
CountrySpain
CityBarcelona
Period20/07/1425/07/14

Fingerprint

Reciprocating pumps
Cavitation
Pump
Computational fluid dynamics
Pumps
Model
Moving Mesh
Water
Pressure gages
Flow of water
Ideal Gas
Water Vapor
Phase Change
Steam
Compressibility
Inertia
Water vapor
Gauge
Gases
History

Keywords

  • Singhal et al cavitation model
  • multiphase flows
  • PD reciprocating pump
  • self-actuated valve model
  • moving mesh

Cite this

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title = "An investigation of the performance of a positive displacement reciprocating pump at low pressure NPSH incorporating a three phase cavitation model",
abstract = "The full cavitation [1] multiphase CFD model of a positive displacement reciprocating pump is presented to investigate performance during the pumping cycle through 360° of the crank shaft rotation. This paper discusses the cavitation appearance and dynamics inside the pump chamber at 100kPa, 50kPa, 25kPa and 0kPa inlet gauge pressure and evaluates the Singhal et al. [1] cavitation model in conditions of incipient cavitation, partial cavitation and full cavitation. The paper also investigates the role of pump inlet valve inertia on cavitation dynamics. The transient CFD model takes into account a three phase flow composed of water, water vapour and 15 parts per million (ppm) of non-condensable ideal gas mass fraction, and utilizes the moving mesh technique to deal with the inlet and outlet valve dynamics. A User Defined Function (UDF) is utilized to couple the pressure field and the valve force and displacement-time histories so thatthe valves are “self-actuated”. A second UDF handles the compressibility model of water which is essential for high outlet pressure and to stabilize the simulation in the situation when the valves are both closed. The paper shows the feasibility of such a complete CFD model of a PD pump, equipped with the Singhal et Al. cavitation model, and its capability to assess the rate of phase change, the efficiency loss and the prediction the valve lift history.",
keywords = "Singhal et al cavitation model, multiphase flows, PD reciprocating pump, self-actuated valve model, moving mesh",
author = "Aldo Iannetti and Matthew Stickland and William Dempster",
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language = "English",
note = "11th World Congress on Computational Mechanics, WCCMXI ; Conference date: 20-07-2014 Through 25-07-2014",

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Iannetti, A, Stickland, M & Dempster, W 2014, 'An investigation of the performance of a positive displacement reciprocating pump at low pressure NPSH incorporating a three phase cavitation model' Paper presented at 11th World Congress on Computational Mechanics, WCCMXI, Barcelona, Spain, 20/07/14 - 25/07/14, .

An investigation of the performance of a positive displacement reciprocating pump at low pressure NPSH incorporating a three phase cavitation model. / Iannetti, Aldo; Stickland, Matthew; Dempster, William.

2014. Paper presented at 11th World Congress on Computational Mechanics, WCCMXI, Barcelona, Spain.

Research output: Contribution to conferencePaper

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T1 - An investigation of the performance of a positive displacement reciprocating pump at low pressure NPSH incorporating a three phase cavitation model

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AU - Stickland, Matthew

AU - Dempster, William

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N2 - The full cavitation [1] multiphase CFD model of a positive displacement reciprocating pump is presented to investigate performance during the pumping cycle through 360° of the crank shaft rotation. This paper discusses the cavitation appearance and dynamics inside the pump chamber at 100kPa, 50kPa, 25kPa and 0kPa inlet gauge pressure and evaluates the Singhal et al. [1] cavitation model in conditions of incipient cavitation, partial cavitation and full cavitation. The paper also investigates the role of pump inlet valve inertia on cavitation dynamics. The transient CFD model takes into account a three phase flow composed of water, water vapour and 15 parts per million (ppm) of non-condensable ideal gas mass fraction, and utilizes the moving mesh technique to deal with the inlet and outlet valve dynamics. A User Defined Function (UDF) is utilized to couple the pressure field and the valve force and displacement-time histories so thatthe valves are “self-actuated”. A second UDF handles the compressibility model of water which is essential for high outlet pressure and to stabilize the simulation in the situation when the valves are both closed. The paper shows the feasibility of such a complete CFD model of a PD pump, equipped with the Singhal et Al. cavitation model, and its capability to assess the rate of phase change, the efficiency loss and the prediction the valve lift history.

AB - The full cavitation [1] multiphase CFD model of a positive displacement reciprocating pump is presented to investigate performance during the pumping cycle through 360° of the crank shaft rotation. This paper discusses the cavitation appearance and dynamics inside the pump chamber at 100kPa, 50kPa, 25kPa and 0kPa inlet gauge pressure and evaluates the Singhal et al. [1] cavitation model in conditions of incipient cavitation, partial cavitation and full cavitation. The paper also investigates the role of pump inlet valve inertia on cavitation dynamics. The transient CFD model takes into account a three phase flow composed of water, water vapour and 15 parts per million (ppm) of non-condensable ideal gas mass fraction, and utilizes the moving mesh technique to deal with the inlet and outlet valve dynamics. A User Defined Function (UDF) is utilized to couple the pressure field and the valve force and displacement-time histories so thatthe valves are “self-actuated”. A second UDF handles the compressibility model of water which is essential for high outlet pressure and to stabilize the simulation in the situation when the valves are both closed. The paper shows the feasibility of such a complete CFD model of a PD pump, equipped with the Singhal et Al. cavitation model, and its capability to assess the rate of phase change, the efficiency loss and the prediction the valve lift history.

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