An investigation of the shear and pressure flows interaction in a hydrostatic journal bearing pocket

• Autorzy: Braun M. J. , Peloso D. , Daniels C. C.
• Języki publikacji: EN

Abstrakty

EN

The present paper studies parametrically the flow patterns and pressure profiles inside of, and on the adjoining seals of a single hydrostatic pocket, characteristic component of hydrostatic journal bearings. The major focus is on the interaction between the effects of the shear flow (Couette) created by the rotation of an eccentric shaft and the pressure induced flow due to hydrostatic jet penetrating at the bottom of the pocket. The pocket is square in nature with a size of 17.8mm x 17.8mm footprint. Its bottom surface has a radial sliding capability, such that the depth of the pocket can be changed, without breaking pocket integrity. This construction allows the study and ensuing comparison of the influence of changes in clearance, jet strength and shaft angular velocity on the flow patterns, pressure profiles and the combined hydrostatic and hydrodynamic effects. The flow structure of the jet and its interaction with the flow in the pocket itself is visualized qualitatively using long distance microscopy (up to x400). The PIV system used herein is equipped with a digital video-camera and a pulsing laser (30mJ/pulse) with a repetition capability of up to 5000Hz.

Słowa kluczowe

EN

hydrostatic pocket; design; flow visualization; shear flow; jet flow

PL

hydromechanika; przepływ strumieniowy; hydrostatyka

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, no 3
• Strony: 739--747
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Braun M. J.

• Department of Mechanical Engineering University of Akron, Akron, Ohio 44325-3903, USA

autor

Peloso D.

• Department of Mechanical Engineering University of Akron, Akron, Ohio 44325-3903, USA

autor

Daniels C. C.

• Ohio Aerospace Institute, Cleveland, ohio 44142, USA

Bibliografia

• [1] Braun M.J. and Batur C. (1991): Non-intrusive laser-based, full field quantitative flow measurements aided by digital image processing. Part2: The hydrostatic journal bearing. - Tribology International, vol.24, No.5, pp.277-290.
• [2] Braun M.J., Daniels C.C. and Peloso D. (2001): Experimental flow patterns and pressure characteristics in a single hydrostatic pocket of variable depth. - Journal of Flow Visualisation and Image Processing, vol.8, No.l, pp. 1-14.
• [3] Canacci V.A. and Braun M.J. (1994): A Qualitative and Quantitative Laser-Based Computer Aided Flow Visualization Method. - NASA Contractor Report 195300.
• [4] Chaomleffel J.P. and Nicolas D. (1986): Experimental investigation of hybrid journal bearings. - Tribology International, vol.19, No.5, pp.253-259.
• [5] Hunt J.B. and Ahmed K.M. (1967-1968): Load capacity stiffness and flow characteristics of a hydrostatically lubricated six pocket bearing supporting a rotating spindle. - Proc. Inst. Mech. Engrs., vol.182, Part.3N, pp.53-62.
• [6] Ho Y.S. and Chen N.N.S. (1984): Pressure distribution in a six-pocket hydrostatic journal bearing. - Wear, vol.98, pp.89-100.
• [7] Krga V. (1997): Experimental Investigation of Flow and Pressure Patterns in a Six Pocket Hydrostatic Bearing. - M.S. Thesis, Department of Mechanical Engineering, University of Akron.
• [8] Speen G.B. (1962): Pressure and flow studies of an experimental externally pressurized gas lubricated bearing. - ASLE Transactions, vol.5, pp.242-253.