• О. М. Яхно The National Technical University of Ukraine "Kyiv Polytechnic Institute", Kyiv, Ukraine
  • Д. В. Костюк The National Technical University of Ukraine "Kyiv Polytechnic Institute", Kyiv, Ukraine
  • Я. Стричек Wroclaw University of Technology, Wroclaw, Poland, Poland
  • П. Антоняк Wroclaw University of Technology, Wroclaw, Poland, Poland



gear pump, cavitation, flow pulsation, flow visualization


Purpose. In gear pump during it operation trapped volumes are appears. In these volumes occurs compression and cavitation of hydraulic fluid. Studying of this process is necessary to improve gear pumps. Approach. For detailed study of these processes was carried out high-speed videography of working process experimental model of a gear pump for different values of pressure at the inlet and outlet and rotational speed of gears. As a result of analysis of the materials that was obtained during experiments, it was found that in the trapped volumes formed by the teeth of the gears, there is a cavitation of fluid, and the subsequent collapse of cavitation bubbles during the opening of a trapped volumes. Findings. The study confirmed that in trapped volumes appears cavitation as it was described in many papers. Value. As a result of the study were obtained the flow pattern in the gear pump. The cavitation in the trapped volumes leads to additional ripples of flow at the outlet of gear pump.

Author Biography

О. М. Яхно, The National Technical University of Ukraine "Kyiv Polytechnic Institute", Kyiv



Judin E. M. Shesterennye nasosy. Osnovnye parametry i ih raschjot.(Gear pumps. The main parameters and their calculation), Moscow: Mashinostroenie, 1964, 238 p.

Bashta T.M. Ob"emnye nasosy i gidravlicheskie dvigateli gidrosistem.(Displacement pumps and hydraulic drives of hydraulic systems) Moscow, Mashinostroenie, 1974, 606 p.

Shesterennye nasosy s asimmetrichnoj liniej zaceplenija shesteren (teorija, konstrukcija i raschet) [Gear pumps with an asymmetrical line of action of gears (theory, design and calculation)], Ju.V. Kuleshkov i dr., Kirovograd, KOD, 2009, 257 p.

Kavitatsiya v pererabotke nefti (Cavitation in the oil processing) / Yakhno O.M., Koval A.D., Pishchenko L.I., Paskalov V.P., Yaske N.N., Kiev, Svіt, 1999,257 p.

Fedotkin N.M., Gulyy I.S. Kavitatsiya (Cavitation), Kiev, Poligrafkniga, 1997, 839 p.

R. Knepp, Dzh. Deyli, F. Khemmit, Kavitatsiya (Cavitation), Moscow: Mir, 1974, 687 p.

L.V. Rodionov, G.O. Belov, M.V. Budko, A.N. Kryuchkov, E.V. Shakhmatov, Razrabotka matematicheskoy modeli gidrodinamiki zapertogo obema v shesterennom nasose. (The developement of mathematical model of hydrodynamics of trapped volume in the gear pump), Vestnik Samarskogo gosudarstvennogo aerokosmicheskogo universiteta (Samara State Aerospace University), no 3(19), 2009, pp.189-193.