Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Abstract

A fast rotating 1500 rpm radial piston digital displacement motor connected to a 350 bar high pressure manifold is simulated by means of transient 3D CFD analysis of a single pressure chamber. The analysis includes dynamic piston and valve movement, influencing the boundaries of the fluid domain. Movement of the low and high pressure valves is coupled to fluid forces and valve actuation is included to control the valve movement according to the pressure cycle of the digital displacement motor. The fluid domain is meshed using a structured/unstructured non-conformal mesh, which is updated throughout the simulation using layering zones as required by the moving fluid boundaries. The effect of cavitation at low pressures is included by implementing a pressure dependent density, based on an effective bulk modulus model. In addition, pressure dependent oil viscosity is included in the analysis. As a result of the CFD analysis, the dynamic response of the pressure chamber and valve movement of a digital displacement motor is presented, along with the total efficiency of a multi-chamber motor at full and partial displacement. Simulation predicts that pressure over- and undershoot may be reduced to a few percent of the high pressure manifold level by precise timing and fast switching of the seat valves.
Original languageEnglish
Title of host publicationProceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control : FPMC 2013
Number of pages10
PublisherAmerican Society of Mechanical Engineers
Publication date2013
Article numberV001T01A042
ISBN (Print)978-0-7918-5608-6
DOIs
Publication statusPublished - 2013
EventBath/ASME Symposium on Fluid Power and Motion Control, FPMC 2013 - Sarasota, Florida, United States
Duration: 6 Oct 20139 Oct 2013

Conference

ConferenceBath/ASME Symposium on Fluid Power and Motion Control, FPMC 2013
CountryUnited States
CitySarasota, Florida
Period06/10/201309/10/2013

Fingerprint

Dynamic analysis
Computational fluid dynamics
Fluids
Pistons
Seats
Cavitation
Dynamic response
Elastic moduli
Viscosity

Cite this

Rømer, D., Johansen, P., Pedersen, H. C., & Andersen, T. O. (2013). Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis. In Proceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control: FPMC 2013 [V001T01A042 ] American Society of Mechanical Engineers. https://doi.org/10.1115/FPMC2013-4469
Rømer, Daniel ; Johansen, Per ; Pedersen, Henrik C. ; Andersen, Torben Ole. / Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis. Proceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control: FPMC 2013. American Society of Mechanical Engineers, 2013.
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abstract = "A fast rotating 1500 rpm radial piston digital displacement motor connected to a 350 bar high pressure manifold is simulated by means of transient 3D CFD analysis of a single pressure chamber. The analysis includes dynamic piston and valve movement, influencing the boundaries of the fluid domain. Movement of the low and high pressure valves is coupled to fluid forces and valve actuation is included to control the valve movement according to the pressure cycle of the digital displacement motor. The fluid domain is meshed using a structured/unstructured non-conformal mesh, which is updated throughout the simulation using layering zones as required by the moving fluid boundaries. The effect of cavitation at low pressures is included by implementing a pressure dependent density, based on an effective bulk modulus model. In addition, pressure dependent oil viscosity is included in the analysis. As a result of the CFD analysis, the dynamic response of the pressure chamber and valve movement of a digital displacement motor is presented, along with the total efficiency of a multi-chamber motor at full and partial displacement. Simulation predicts that pressure over- and undershoot may be reduced to a few percent of the high pressure manifold level by precise timing and fast switching of the seat valves.",
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Rømer, D, Johansen, P, Pedersen, HC & Andersen, TO 2013, Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis. in Proceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control: FPMC 2013., V001T01A042 , American Society of Mechanical Engineers, Bath/ASME Symposium on Fluid Power and Motion Control, FPMC 2013, Sarasota, Florida, United States, 06/10/2013. https://doi.org/10.1115/FPMC2013-4469

Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis. / Rømer, Daniel; Johansen, Per; Pedersen, Henrik C.; Andersen, Torben Ole.

Proceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control: FPMC 2013. American Society of Mechanical Engineers, 2013. V001T01A042 .

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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AB - A fast rotating 1500 rpm radial piston digital displacement motor connected to a 350 bar high pressure manifold is simulated by means of transient 3D CFD analysis of a single pressure chamber. The analysis includes dynamic piston and valve movement, influencing the boundaries of the fluid domain. Movement of the low and high pressure valves is coupled to fluid forces and valve actuation is included to control the valve movement according to the pressure cycle of the digital displacement motor. The fluid domain is meshed using a structured/unstructured non-conformal mesh, which is updated throughout the simulation using layering zones as required by the moving fluid boundaries. The effect of cavitation at low pressures is included by implementing a pressure dependent density, based on an effective bulk modulus model. In addition, pressure dependent oil viscosity is included in the analysis. As a result of the CFD analysis, the dynamic response of the pressure chamber and valve movement of a digital displacement motor is presented, along with the total efficiency of a multi-chamber motor at full and partial displacement. Simulation predicts that pressure over- and undershoot may be reduced to a few percent of the high pressure manifold level by precise timing and fast switching of the seat valves.

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Rømer D, Johansen P, Pedersen HC, Andersen TO. Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis. In Proceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control: FPMC 2013. American Society of Mechanical Engineers. 2013. V001T01A042 https://doi.org/10.1115/FPMC2013-4469