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The influence of incidence angle on the aerodynamics of condensing flow around a rotor tip section of steam turbine

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Abstract

In this paper, the influence of incidence angle on the aerodynamics of the steam flow field around a rotor tip section is investigated. An Eulerian–Eulerian method, based on a non-equilibrium thermodynamics model for simulating the wet flow is employed. In this study, the effects of incidence angle on different design parameters such as: outflow Mach number, outflow gas phase mass fraction, loss coefficient and deviation angle are studied.

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Notes

  1. International Association of Properties of Water and Steam.

Abbreviations

A :

Area (m2)

C :

Chord (mm)

h :

Static enthalpy (J/kg)

H :

Total enthalpy (J/kg)

i :

Incidence angle (=β in  − χ in ) (°)

J :

Nucleation rate [(Droplet #’s)/(m3 s)]

k :

Conduction coefficient (W/m K)

m :

Mass (kg)

M :

Mach number

N :

Number of droplets per unit mass of vapor [(Droplet #’s)/kgg]

P :

Pressure (N/m2)

S :

Blade pitch (mm)

S w+d , S h :

Source term for energy equation (W/m3)

S F , S u :

Source term for momentum equation (N/m3)

S m :

Source term representing the evaporation rate of vapor [kg/(m3 s)]

t :

Time (s)

T :

Temperature (K)

ΔT :

Super cooling degree (=Tsat − Tg) (K)

U :

Velocity (m/s)

X :

Spatial dimension (m)

y + :

Dimensionless wall distance

Α :

Mass fraction of liquid water to water vapor (kgf/kgg)

Γ :

Specific heat ratio

Β :

Flow direction (°)

Ω :

Specific dissipation rate (1/s)

Κ :

Turbulent kinetic energy (m2/s2)

Μ :

Dynamic viscosity [kg/(m s)]

Π :

Pressure loss coefficient

Ρ :

Density (kg/m3)

χ :

Blade metal angle (°)

out :

Outlet condition

eff :

Effective (laminar + turbulent)

f :

Liquid

g :

Gas

i, j :

Tensor notation

in :

Inlet condition

0 :

Stagnation condition

Sat :

Saturation

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Authors and Affiliations

  1. Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran

    H. Beheshti Amiri

  2. Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran

    F. Salmaniyeh

  3. Department of Mechanical Engineering, Tehran University, Tehran, Iran

    A. Izadi

Authors
  1. H. Beheshti Amiri
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Correspondence to H. Beheshti Amiri.

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Beheshti Amiri, H., Salmaniyeh, F. & Izadi, A. The influence of incidence angle on the aerodynamics of condensing flow around a rotor tip section of steam turbine. Heat Mass Transfer 52, 2423–2436 (2016). https://doi.org/10.1007/s00231-015-1736-7

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  • DOI: https://doi.org/10.1007/s00231-015-1736-7

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