Bearing capacity of reaction turbine impeller

Аuthors

Ovchinnikov I. V.^*, Homjakov A. M.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: ioresult@hotmail.ru

Abstract

The work considers elaboration for methods to determine the bearing capacity for reaction turbine impellers for all range oj loads fr om centrifugal forces, differential pressure and thermal load. Analytical methods for construction of limit surface based on bearing capacity theory and for calculating margin of safety using the constructed surface wh ere elaborated. Finite element analysis with nonlinear material model and temperature dependent material properties, implemented in MSC.Nastran software, was used for more precise construction of limit surface. Special software was developed for automation of limit surface construction. Analysis of the surface allows for more precise turbine's margin of safety calculations and helps to decide for better ways to uprate turbine. 

Keywords:

reaction turbine, impeller, bearing capacity, limit values, breaking surface, limit state, nonlinear material model, finite elements