Investigation of thermal behavior and orifice flow characteristics of aeronautic hydraulic servo-proportional valve spool-sleeve structure with numerical simulations

Year 2022, Volume: 3 Issue: 3, 120 - 131, 31.12.2022

Soner Şen , Rıza Deniz Şimşek

https://doi.org/10.55212/ijaa.1208520

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.

Keywords

Servo-proportional valve , Thermal stress , Hydraulic orifice , Jet-flow , Hydraulic turbulence

Project Number

1180074

References

• Batoli, M. 1996. Theoretical and experimental analysis of flow forces on a hydraulic directional control valve. Oleodinamica e Pneumatica, 3, 10–16.
• 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.
• 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.
• 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.
• Macor A. 2002 Experimental analysis on a directional valve with a flat notch metering section. In: Proceedings of the 57 Congresso Nazionale ATI, Pisa.
• Baudry, X., Mare, J.C. 2000. Linking CFD and lumped parameters analysis for the design of flow compensated spool valves. Proceedings of the1st FPNI-PhD symposium Hamburg, 249–58.
• Krishnaswamy, K., Li, P.Y. 2002. On using unstable electrohydraulic valves for control. Journal of Dynamic Systems, Measurement and Control, 124, 183.
• Yuan, Quinghui, Li., Perry Y. 2004. Using steady flow force for unstable valve design: modeling and experiments. Journal of Dynamic Systems, Measurement and Control, 127, 451.
• Amirante, R., Moscatelli, P.G., Catalano, L.A. 2007. Evaluation of the flow forces on a direct (single stage) proportional valve by means of a computational fluid dynamic analysis. Energy Conversion and Management, 48,942–953.
• 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, 47,1748–1760.
• Antonio P., Paolo, O., Antonio, L. 2013. Analysis of a directional hydraulic valve by a Direct Numerical Simulation using an immersed-boundary method. Energy Conversion and Management, 65, 497–506.
• Yaobao, Y., Jiayang, Y., Shengrong, G. 2017. Numerical study of solid particle erosion in hydraulic spool valves. Wear, 392,174–189.
• Yi, Y., Chen-Bo, Y., Xing-Dong, Li., Wei-jin, Z., Feng-feng, Y. 2014. Effects of groove shape of notch on the flow characteristics of spool valve. Energy Conversion and Management, 86, 1091–1101.
• Borghi, M., Milani, M., Paoluzzi, R. 2000. Stationary axial flow force analysis on compensated spool valve. International Journal of Fluid Power, 1, 17–25.
• Yang, Y.S., Semini, C., Tsagarakis, N.G., Caldwell, D.G., Zhu, Y.Q. 2008. Water hydraulics – a novel design of spool-type valves for enhanced dynamic performance. In: Proceeding of the 2008 IEEE/ASME international conference on advanced intelligent mechatronics, Xi’an, 1308–14.
• Miller, R., Fujii, Y., McCallum, J., Strumolo, G., Tobler, W., Pritts, C. 1995. CFD simulation of steady-state flow forces on spool-type hydraulic valves. SAE Technical Paper Series, 295–307.
• Krishnaswamy, K., Li, P.Y. 2002. On using unstable electrohydraulic valves for control. Journal of Dynamic Systems, Measurement and Control, 124,183–90.