NDLI: Experimental Validation of Flow Force Models for Fast Switching Valves

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Niels, C. Bender Noergaard, Christian Henrik, C. Pedersen
Copyright Year	2017
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.
Sponsorship	Fluid Power Systems and Technology Division
File Format	PDF
ISBN	9780791858332
DOI	10.1115/FPMC2017-4230
Conference Proceedings	ASME/BATH 2017 Symposium on Fluid Power and Motion Control
Language	English
Publisher Date	2017-10-16
Publisher Place	Sarasota, Forida, USA
Access Restriction	Subscribed
Subject Keyword	Design Geometry Fluids Numerical analysis Simulation Computational fluid dynamics Dynamics (mechanics) Measurement uncertainty Valves Flow (dynamics)
Content Type	Text
Resource Type	Article

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