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Numerical Investigation for a Vanned Mixed Flow Turbine Volute Under Steady Conditions

  • Ahmed KetataEmail author
  • Zied Driss
Chapter

Abstract

For automotive applications, a turbocharger which consists essentially of a radial turbine and a centrifugal compressor is used to get more available output torque for internal combustion engines. The volute is also an important component for a turbocharger turbine. It transforms a part of the engine exhaust gas energy into kinetic energy and guides the flow toward the rotor inducer at a suitable flow angle value. This chapter presents our numerical model in order to capture the flow fields within a vanned volute under steady conditions. Numerical simulations were conducted using the CFX 17.0 package to solve Navier–Stokes equations by means of a finite volume discretization method. The good agreement between the experimental and numerical results of the turbine performance confirms the validation of our numerical model. Then, many computed flow discharge parameters such as the averaged volute exit flow angle were plotted to understand the behavior of the volute under different turbine expansion ratios. Furthermore, several loss coefficient distribution and entropy contours were plotted to characterize the occurring losses. In addition, pressure distributions, velocity, and turbulence parameters as well as streamlines were numerically obtained to analyze the flow behavior within the turbine volute.

Keywords

CFD Turbulence Mixed flow turbine Turbocharger Performance Mass flow rate Efficiency 

Nomenclature

C

Absolute flow velocity, m s−1

Cis

Spouting velocity or isentropic velocity, m s−1

h

Enthalpy per unit mass, J kg−1

k

Turbulence kinetic energy, J kg−1

Kp

Total pressure loss coefficient, dimensionless

\( \dot{m} \)

Mass flow, kg s−1

MFP

Mass flow parameter, kg s−1 \( \sqrt {\text{K}} \)  Pa−1

P

Pressure, Pa

PR

Pressure ratio, dimensionless

r

Radius, m

S

Swirl coefficient, dimensionless

T

Temperature, K

U

Blade tip velocity, m s−1

V

Velocity, m s−1

Greeks

α

Absolute flow angle, (°)

ε

Turbulence dissipation rate, m2 s−3

ζ

Loss coefficient, dimensionless

η

Isentropic efficiency, dimensionless

ψ

Azimuth angle, (°)

Subscripts

ex

Exit

in

Inlet

is

Isentropic condition

ts

Total to static

S

Stator

θ

Tangential component

0

Stagnation condition

1

Volute inlet

2

Volute exit

3

Vane exit

4

Rotor exit

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of Sfax (ENIS)University of SfaxSfaxTunisia

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