The spherical valve plate/cylinder block pair has the advantages of strong overturning resistance and large bearing area. However, the configurations of the unloading and pre-boosting triangular grooves on the spherical valve plate are different from those in the planar valve plate, resulting in special cavitation phenomenon on the spherical port plate pair. In order to study cavitation characteristics of spherical port plate pair, a dynamic CFD model of the piston pump including turbulence model, cavitation model and fluid compressibility is established. A detailed UDF compilation scheme is provided for modelling of the micron-sized spherical oil film mesh, which makes up for the lack of research on the meshing of the spherical oil film. In this paper, using CFD simulation tools, from the perspectives of pressure field, velocity field and gas volume fraction change, a detailed analysis of the transient evolution of the submerged cavitation jet in a axial piston pump with spherical valve plate is carried out. The study indicates the movement direction of the cavitation cloud cluster through the cloud image and the velocity vector direction of the observation point. The sharp decrease of velocity and gas volume fraction indicates the collapse phenomenon of bubbles on the part wall surface. These discoveries verify the special erosion effect in case of the spherical valve plate/cylinder block pair. The submerged cavitation jet generated by the unloading triangular grooves distributed on the spherical valve plate not only cause denudation of the inner wall surface of the valve plate, but also cause strong impact and denudation on the lower surface of the cylinder body. Finally, the direction of the unloading triangular groove was modified to extend the distance between it and the wall surface which can effectively alleviate the erosion effect.
Bin Zhao
,
Weiwei Guo
,
Long Quan
. Cavitation of a Submerged Jet at the Spherical Valve Plate/Cylinder Block Interface for Axial Piston Pump[J]. Chinese Journal of Mechanical Engineering, 2020
, 33(5)
: 67
-67
.
DOI: 10.1186/s10033-020-00486-8
[1] A Lannetti, M T Stickland, Dempster W M. A CFD and experimental study on cavitation in positive displacement pumps Benefits and drawbacks of the full cavitation model. Engineering Applications of Computational Fluid Mechanics, 2016, 10(1): 57-71.
[2] R Amirante, E Distaso, P Tamburrano. Experimental and numerical analysis of cavitation in hydraulic proportional directional valves. Energy Conversion and Management, 2014, 87: 208-219.
[3] Z Rui, X C Hong. Numerical analysis of cavitation within slanted axial-flow pump. Journal of Hydrodynamics, 2013, 25(5): 663-672.
[4] J Zhou, A Vacca, P Casoli. A novel approach for predicting the operation of external gear pumps under cavitating conditions. Simulation Modelling Practice and Theory, 2014, 45: 35-49.
[5] E Frosina, A S Orcid, O A M Rigosi. Study of a high-pressure external gear pump with a computational fluid dynamic modeling approach. Energies, 2017, 10(8): 1113.
[6] G E Totten, Y H Sun, Jr R J Bishop. Hydraulic system cavitation: A review. SAE Transactions, 1998: 368-380.
[7] Q Chao. Research on some key technologies of high-speed rotation for axial piston used in EHAs. Hangzhou: Zhejiang University, 2019.
[8] E O T Kunimoto. Cavitation detection in the oil hydraulic equipments: Proceedings of the JFPS International Symposium on Fluid Power. The Japan Fluid Power System Society, 1996(3): 461-466.
[9] J J Zhou. Study on cavitaion in multi-connected volumes and its effects on the operation of gear pumps. Beijing: Beijing Institute of Technology, 2015.
[10] W K, Z K, M S, et al. Possibilities of diagnosing cavitation in hydraulic systems. Archives of Civil and Mechanical Engineering, 2007, 7(1): 61-73.
[11] W Wustmann. Experimentelle und numerische Untersuchung der Strömungsvorgänge in hydrostatischen Verdrängereinheiten am Beispiel von Außenzahnrad-und Axialkolbenpumpe. Technische Universität Dresden, Institut für Fluidtechnik, 2010. (in Gemany)
[12] G Sravani, P Michael, Jennifer Kensler M C, et al. An investigation of hydraulic fluid composition and aeration in an axial piston pump. Fluid Power Systems Technology, American Society of Mechanical Engineers, 2017, 58332: V001T01A028.
[13] S Wang. The analysis of cavitation problems in the axial piston pump. Journal of Fluids Engineering-Transactions of the ASME, 2010, 132: 1-6.
[14] R J Bishop, G E Totten. Effect of pump inlet conditions on hydraulic pump cavitation: A review. Hydraulic Failure Analysis: Fluids, Components, and System Effects. ASTM International, 2001.
[15] F L Yin, S Nie, S L Xiao, et al. Numerical and experimental study of cavitation performance in sea water hydraulic axial piston pump. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2016, 230(8): 716-735.
[16] N Bügener, J Klecker, J Weber. Analysis and improvement of the suction performance of axial piston pumps in swash plate design. International Journal of Fluid Power, 2014, 15(3): 153-167.
[17] Z G Sun, S D Xiao, M H Xu, et al. Optimization of plunger cavity cavitation based on cylinder block kidney shape hole. Journal of South China University of Technology (Natural Science Edition), 2016, 44(10): 35-41.
[18] H Kosodo. Development of micro pump and micro-hst for hydraulics. JFPS International Journal of Fluid Power System, 2012, 5(1): 6-10.
[19] M Zecchi, M Ivantysynova. Spherical valve plate design in axial piston machines—a novel thermoelasto-hydrodynamic model to predict the lubricating interface performance. 8th International Conference on Fluid Power Transmission and Control, Hangzhou, China, 2013: 325-329.
[20] H Kosodo, M Nara, S Kakehida, et al. Experimental research about pressure-flow characteristics of V-notch. Proceedings of the JFPS International Symposium on Fluid Power. The Japan Fluid Power System Society, 1996(3): 73-78.
[21] S G Ye, J J Zhang, B Xu, et al. Experimental and numerical studies on erosion damage in damping holes on the valve plate of an axial piston pump. Journal of Mechanical Science and Technology, 2017, 31(9): 4285-4295.
[22] X H Liu. Study on the characteristic of cavitation erosion in hydraulic pump and valve. Chengdu: Southwest Jiaotong University, 2008.
[23] X H Liu. Cavitaiton erosion mechanism of port plate of hydraulic axial plunger pump. Journal of Mechanical Engineering, 2008, 44(11): 203-208. (in Chinese)
[24] T Tetsuhiro. Visualized analysis of cavitation inside axial piston pump. Chinese Gydraulice & Pneumatics, 2015(2): 1-7.
[25] Y Shi, T Lin, G Meng, et al. A Study on the suppression of cavitation flow inside an axial piston pump. 2016 Prognostics and System Health Management Conference (PHM-Chengdu), IEEE, 2016: 1-5.
[26] K Toshiharu, K Kumagai, Y Osafune, et al. Erosion of grooved surfaces by cavitating jet with hydraulic oil. Journal of Flow Control, Measurement & Visualization (JFCMV), 2015, 3(2): 41-50.
[27] E Hutli, S Aboyali, M B Hucine, et al. Influence of hydrodynamic conditions and nozzle geometry on appearance of high submerged cavitation jets. Thermal Science, 2013, 17(4): 1139-1149.
[28] E Hutli, M S Nedeljkovic, A Bonyárd, et al. Experimental study on the influence of geometrical parameters on the cavitation erosion characteristics of high speed submerged jets. Experimental Thermal and Fluid Science, 2017, 80: 281-292.
[29] E Hutli, M Nedeljkovic, A Bonyár. Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations. International Journal of Heat and Mass Transfer, 2018, 117: 873-886.
[30] V Yakhot, S A Orszag, S Thangam, et al. Development of turbulence models for shear flows by a double expansion technique. Phys. Fluids A, 1992, 4(7): 1510-1520.
[31] A K Singhal, M M Athavale, H Li, et al. Mathematical basis and validation of the full cavitation model. Journal of Fluids Engineering, 2002, 124(3): 617-624.
[32] S Hitoshi. Effect of nozzle geometry on a standard cavitation erosion test using a cavitating jet. Wear, 2013, 297: 89.
