Abstract
In this study, the mechanical behavior under highest thermal conditions and flow characteristics of the hydraulic fluid of the servo-characterized proportional valve, which is one of the indispensable components of the aviation industry and used for hydraulic flow control, were investigated numerically. In the simulations, 50, 75 and 100 °C were selected as temperatures, and 0.2 mm, 0.6 mm and 1.2 mm spool stroke openings were used for hydrodynamic flow. Simulations were carried out for a pressure difference of 35 bar. As a result of the analysis, it was observed that there was no restriction in the movement of the spool-sleeve structure for a temperature of 75°C, excessive friction occurred in the spool-sleeve structure at 100°C and the movement was restricted. In addition, it can be said that hydraulic turbulences are effective in dispersing polluting particulate matter for all three spool strokes at a pressure difference of 35 bar.
Reference17 articles.
1. Batoli, M. 1996. Theoretical and experimental analysis of flow forces on a hydraulic directional control valve. Oleodinamica e Pneumatica, 3, 10–16.
2. Amirante, R., Del Vescovo, G., Lippolis, A. 2006. Evaluation of the flow forces on an open centre directional control valve by means of a computational fluid dynamic analysis. Energy Conversion and Management, 47, 1748–60.
3. Amirante, R., Del Vescovo, G., Lippolis, A. 2006. A flow forces analysis of an open center hydraulic directional control valve sliding spool. Energy Conversion and Management, 47, 114–31.
4. Lisowski, E., Czyzycki, W. and Rajda, J. 2013. Three dimensional CFD analysis and experimental test of flow force acting on the spool of solenoid operated directional control valve. Energy Conversion and Management, 70, 220-229.
5. Macor A. 2002 Experimental analysis on a directional valve with a flat notch metering section. In: Proceedings of the 57 Congresso Nazionale ATI, Pisa.