Experimental Validation of Flow Force Models for Fast Switching Valves

Niels Christian Bender, Henrik Clemmensen Pedersen, Christian Nørgård

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

3 Citations (Scopus)

Abstract

This paper comprises a detailed study of the forces acting on a Fast Switching Valve (FSV) plunger. The objective is to investigate to what extend different models are valid to be used for design purposes. These models depend on the geometry of the moving plunger and the properties of the surrounding medium. A few analytic expressions have been suggested in the literature and these have been supported by CFD simulations, yielding accurate coherence for a large part of the fluid domain. However, when a moving body approaches a stationary body, squeeze film effects will occur if the plunger velocity is non-zero. This is the case in FSVs, where it results in an additional dampening effect, which is of relevance when analyzing contact-impact. Experimental data from different tests cases of a FSV has been gathered, with the plunger moving through a medium of either oil or air. This data is used to compare and validate different models, where an effort is directed towards capturing the fluid squeeze effect just before material on material contact. The test data is compared with simulation data relying solely on analytic formulations. The general dynamics of the plunger is validated for the established models, but an additional investigation of the dampening force is necessary. Therefore, numerical analyses are introduced to enhance the knowledge of the hydrodynamic end dampening. This has a visible effect on the velocity profile at the end-stop. This profile represents the measurements more accurately, but it is not possible to verify the velocity profile at the valve seat end-stop due to measurement uncertainties.
Original languageEnglish
Title of host publicationProceedings of ASME/BATH Symposium on Fluid Power & Motion Control
Number of pages10
PublisherAmerican Society of Mechanical Engineers
Publication date18 Oct 2017
ISBN (Electronic)978-0-7918-5833-2
DOIs
Publication statusPublished - 18 Oct 2017
EventASME/BATH 2017 Symposium on Fluid Power & Motion Control - Lido Beach Resport, Sarasota, United States
Duration: 16 Oct 201719 Oct 2017
http://www.asmeconferences.org/FPMC2017/

Conference

ConferenceASME/BATH 2017 Symposium on Fluid Power & Motion Control
LocationLido Beach Resport
CountryUnited States
CitySarasota
Period16/10/201719/10/2017
Internet address

Fingerprint

Fluids
Contacts (fluid mechanics)
Computational fluid dynamics
Hydrodynamics
Geometry
Air
Uncertainty
Oils

Cite this

Bender, N. C., Pedersen, H. C., & Nørgård, C. (2017). Experimental Validation of Flow Force Models for Fast Switching Valves. In Proceedings of ASME/BATH Symposium on Fluid Power & Motion Control American Society of Mechanical Engineers. https://doi.org/10.1115/FPMC2017-4230
Bender, Niels Christian ; Pedersen, Henrik Clemmensen ; Nørgård, Christian. / Experimental Validation of Flow Force Models for Fast Switching Valves. Proceedings of ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 2017.
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abstract = "This paper comprises a detailed study of the forces acting on a Fast Switching Valve (FSV) plunger. The objective is to investigate to what extend different models are valid to be used for design purposes. These models depend on the geometry of the moving plunger and the properties of the surrounding medium. A few analytic expressions have been suggested in the literature and these have been supported by CFD simulations, yielding accurate coherence for a large part of the fluid domain. However, when a moving body approaches a stationary body, squeeze film effects will occur if the plunger velocity is non-zero. This is the case in FSVs, where it results in an additional dampening effect, which is of relevance when analyzing contact-impact. Experimental data from different tests cases of a FSV has been gathered, with the plunger moving through a medium of either oil or air. This data is used to compare and validate different models, where an effort is directed towards capturing the fluid squeeze effect just before material on material contact. The test data is compared with simulation data relying solely on analytic formulations. The general dynamics of the plunger is validated for the established models, but an additional investigation of the dampening force is necessary. Therefore, numerical analyses are introduced to enhance the knowledge of the hydrodynamic end dampening. This has a visible effect on the velocity profile at the end-stop. This profile represents the measurements more accurately, but it is not possible to verify the velocity profile at the valve seat end-stop due to measurement uncertainties.",
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Bender, NC, Pedersen, HC & Nørgård, C 2017, Experimental Validation of Flow Force Models for Fast Switching Valves. in Proceedings of ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, Sarasota, United States, 16/10/2017. https://doi.org/10.1115/FPMC2017-4230

Experimental Validation of Flow Force Models for Fast Switching Valves. / Bender, Niels Christian; Pedersen, Henrik Clemmensen; Nørgård, Christian.

Proceedings of ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 2017.

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

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N2 - This paper comprises a detailed study of the forces acting on a Fast Switching Valve (FSV) plunger. The objective is to investigate to what extend different models are valid to be used for design purposes. These models depend on the geometry of the moving plunger and the properties of the surrounding medium. A few analytic expressions have been suggested in the literature and these have been supported by CFD simulations, yielding accurate coherence for a large part of the fluid domain. However, when a moving body approaches a stationary body, squeeze film effects will occur if the plunger velocity is non-zero. This is the case in FSVs, where it results in an additional dampening effect, which is of relevance when analyzing contact-impact. Experimental data from different tests cases of a FSV has been gathered, with the plunger moving through a medium of either oil or air. This data is used to compare and validate different models, where an effort is directed towards capturing the fluid squeeze effect just before material on material contact. The test data is compared with simulation data relying solely on analytic formulations. The general dynamics of the plunger is validated for the established models, but an additional investigation of the dampening force is necessary. Therefore, numerical analyses are introduced to enhance the knowledge of the hydrodynamic end dampening. This has a visible effect on the velocity profile at the end-stop. This profile represents the measurements more accurately, but it is not possible to verify the velocity profile at the valve seat end-stop due to measurement uncertainties.

AB - This paper comprises a detailed study of the forces acting on a Fast Switching Valve (FSV) plunger. The objective is to investigate to what extend different models are valid to be used for design purposes. These models depend on the geometry of the moving plunger and the properties of the surrounding medium. A few analytic expressions have been suggested in the literature and these have been supported by CFD simulations, yielding accurate coherence for a large part of the fluid domain. However, when a moving body approaches a stationary body, squeeze film effects will occur if the plunger velocity is non-zero. This is the case in FSVs, where it results in an additional dampening effect, which is of relevance when analyzing contact-impact. Experimental data from different tests cases of a FSV has been gathered, with the plunger moving through a medium of either oil or air. This data is used to compare and validate different models, where an effort is directed towards capturing the fluid squeeze effect just before material on material contact. The test data is compared with simulation data relying solely on analytic formulations. The general dynamics of the plunger is validated for the established models, but an additional investigation of the dampening force is necessary. Therefore, numerical analyses are introduced to enhance the knowledge of the hydrodynamic end dampening. This has a visible effect on the velocity profile at the end-stop. This profile represents the measurements more accurately, but it is not possible to verify the velocity profile at the valve seat end-stop due to measurement uncertainties.

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Bender NC, Pedersen HC, Nørgård C. Experimental Validation of Flow Force Models for Fast Switching Valves. In Proceedings of ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers. 2017 https://doi.org/10.1115/FPMC2017-4230