Journal Bearings in Turbomachinery

ISBN-13: 9781475756258 / Angielski / Miękka / 2013 / 176 str.

David MacLeish Smith

Opis

This book deals with the functioning of hydrodynamic journal bearings in turbomachinery. It makes particular reference to large turbine- generator and marine propulsion plant. Journal-bearing design in this field has been based mainly on experience supplemented by full-scale experimental test. Development is becoming influenced to an increasing extent by research and analysis. Particular attention is given in this book to correlation of research and analytical work with the observed operating characteristics of journal bearings. The physical phenomena in bearings are complicated, and analysis is rendered convenient only by making simplifying assumptions. The engineer must know which assumptions are serviceable and in what operating conditions they may be applied. Current British and European practice in journal bearings is illus- trated. An examination is made of steady running characteristics, as predicted by theory and as established by test. Some account is given of the dynamic characteristics of journal bearings and of their in- fluence in machine vibration. Service experience of journal bearings is reviewed, and reference is made to possible future trends in develop- ment. The book is the outcome of work on turbine plant with Metropolitan- Vickers and its successor Associated Electrical Industries. The A.E. . and English Electric activities in this field have recently been incor- porated in English Electric-A.E. . Turbine-Generators Ltd. The author expresses his gratitude to the Company for permission to publish the results. He thanks the English Electric Co. Ltd., C. A.

Spis treści

I — Theory and Practice.- 1 Bearing Development and Bearing Theory.- 2 Current Practice in Journal Bearings.- II — Performance in Steady Running.- 3 Functioning of Journal Bearings.- 4 Conventional Hydrodynamic Theory of Laminar Flow.- 5 Similarity Rules, Flow Regimes, and Characteristic Relations.- 6 Observed Bearing Performance.- 7 Approximate Assessment of Performance.- III — Dynamic Characteristics.- 8 Journal Bearings in Vibration.- 9 Conventional Theory of Linearized Dynamic Characteristics with Laminar Flow.- 10 Effects of Inertia of Oil on Dynamic Characteristics.- 11 Experimental Investigation of Dynamic Characteristics.- 12 Influence of Bearings in Turbomachinery Vibration.- IV — Operational Experience and Prospective Development.- 13 Operation of Journal Bearings in Turbomachinery.- 14 Prospects in Development of Journal Bearings.- Appendices.- i Analytical Solution for Very Narrow Bearing.- ii Analytical Solution for Infinitely Wide Bearing.- iii Transformation of Axes.- iv Limiting Value of Characteristics at High Eccentricity Ratio.- v Definitions and Units of Viscosity.- vi Properties of Turbine Lubricating Oils.- vii The Apparent Out-of-balance Coefficients.- References.