Development of Oil Hydraulic Components Using a Flow Visualization Technique
Tetsuhiro Tsukiji*, Eishin Noguchi**, and Futoshi Yoshida**
*Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
**KYB Corporation, 1-12-1 Asamizodai, Minami-ku, Sagamihara-shi, Kanagawa-ken 252-0328, Japan
In the present study, we succeed in observing cavitating flow near a notch (V-shaped groove) in a valve plate in an axial piston pump, and we improve an oil hydraulic ball valve, using the visualization technique. Our model of the axial piston pump, is designed to allow the jet flow near the notch and the cavitation cloud to be observed clearly from two directions using a high-speed video camera. Computational Fluid Dynamics (CFD) is employed to estimate the occurrence and the region of the cavitation cloud. It is found that our CFD method is very useful for estimating the region of the cavitation cloud. It is further found that adding notches serves to greatly reduce the cavitation region. Using a commercially available digital video camera, a high-speed video camera, and X-rays source, we also succeed in improving an oil hydraulic ball valve by preventing vibration, cavitation, and the noise.
-  K. Ito, K. Inoue, and K. Saito, “Visualization and Detection of Cavitation in V-Shaped Groove Type Valve Plate of an Axial Piston Pump,” Proc. of the third JHPS Int. Symp. on Fluid Power, YOKOHAMA, pp. 67-72, 1996.
-  H. Kosodo, M. Nara, S. Kakehida, and T. Imanari, “Experimental Research about Pressure-flow Characteristics of V-Notch,” Proc. of the third JHPS Int. Symp. on Fluid Power, YOKOHAMA, pp. 73-78, 1996.
-  T. Tsukiji, S. Sakura, K. Nagata, and E. Noguchi, “Visualization Analysis of Cavitating Jet Flow Issuing from Notch in an Axial Piston Pump,” Trans. of the Japan Fluid Power System Society, Vol.38, No.4, pp. 12-16, 2007.
-  K.-S. Yu, “Study on the Method of Computation of a Flow Using a Streamline Coordinate System,” Doctoral dissertation, Sophia University, 1999.
-  T. Tsukiji, R. Mori, Y. Sendou, K. Nagata, and G. Maoying, “A Study on the Flow in a Ball Valve,” The Proc. on Autumn Conf. of Japan Fluid Power System Society 2001, pp. 25-27, 2001.
-  T. Tsukiji, “Flow Analysis in Control Valve Using a Vortex Method,” Proc. of 1st Int. Conf. on Computational Methods in Fluid Power Technology (Methods for solving Practical Problems in Design and Control), CD-ROM, 2003.
-  T. Tsukiji, T. Takase, and E. Noguti, “Visualization Analysis of Cavitating Jet Flow Issuing from Notch in an Axial Piston Pump,” Trans. of the Japan Fluid Power System Society, Vol.42, No.1, pp. 7-12, 2011.
-  A. K. Singhal, M. M. Athavale, H. Li, and Y. Jiang, “Mathematical basis and validation of the full cavitation model,” J. Fluid Eng., Vol.124, No.3, pp. 617-624, 2002.
-  T. Tsukiji, G. Matsumoto, S. Sakura, K. Nagata, and F. Yoshida, “Improvement of an oil hydraulic ball valve using visualization technique,” Trans. of the Japan Fluid Power System Society, Vol.35, No.6, pp. 103-108, 2004.