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Structural design and stress analysis of a high-speed turbogenerator assembly supported by hydrodynamic bearings

  • Rodrigo T. BentoEmail author
  • André Ferrus Filho
  • Marco A. Fumagalli
Technical Paper
  • 74 Downloads

Abstract

Turbine and bushing bearing are the most critical components of high-speed machines. This paper describes the design of a high-speed turbine supported by hydrodynamic bearings. The mathematical dimensioning and the FEM analysis are presented to validate the mechanical strength of the turbine and the bushing bearing models. Fatigue life and factor of safety are also determined. The simulations show that the maximum von Mises stress values obtained are associated with the centrifugal force generated by the system rotational movement. The results variation is mainly due to the properties of the materials proposed. For the turbine, 7075-T6 aluminum alloy and SAE 4340 steel obtained satisfactory behavior under a constant operating speed of 30,000 RPM. For the hydrodynamic bearing, the TM23 bronze alloy exhibited excellent results, without fracture, and low mechanical deformation. The models exhibited a great potential employment in several applications, such as biogas systems to generate electrical energy, and educational test bench for thermodynamic and tribological simulations.

Keywords

High-speed machines Structural design Steam turbine Hydrodynamic bearings FEM analysis 

List of symbols

µd

Coefficient of dynamic friction

Turbine full-arc

Cy

Blades theoretical velocity

Dm

Mean blade diameter

Ff

Dynamic friction force

FN

Normal force

he

Input enthalpy

hs

Output enthalpy

Mass flow

ƞi

Internal efficiency

ƞm

Mechanical efficiency

R

Mean radius of blades length

u

Tangential velocity

vm

Mean velocity coefficient

Power

Z

Number of blades

Zmin

Minimum number of blades

γ

Specific internal work

ε

Coefficient of laminar steam flow

ω

Angular velocity

Notes

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Nuclear and Energy Research Institute, IPEN–CNEN/SPUniversity of São PauloSão PauloBrazil
  2. 2.Universidade São Judas TadeuSão PauloBrazil
  3. 3.Faculdade de Tecnologia TermomecanicaSalvador Arena FoundationSão Bernardo do CampoBrazil

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