Encyclopaedia Index

### TITLE : COLD SWIRLING-FLOW FURNACE SIMULATION

BY: M R Malin & S Semin - CHAM Development Team
O Olsvik - STATOIL, RTD, Norway

DATE: 1995

PHOENICS VERSION: 2.1.3

### PURPOSE OF THE CALCULATIONS:

- The problem considered is 2-dimensional axisymmetric, steady, turbulent
isothermal swirling flow in the laboratory furnace of Weber et al (Int.J.
Heat and Fluid Flow, Vol.11, No.3, p225 (1990)).

- The main objective of the calculations is to validate both the staggered-
BFC momentum equations and the turbulence modelling for swirling flow.

- The calculations are a precursor to applying the PHOENICS extended SCRS
attachment to swirling gaseous combustion in an industrial furnace.

### FLOW AND COMPUTATIONAL DETAILS :

- The flow geometry consists of a solid-body vortex generator of 0.19m
diameter, a 20-degree conical burner quarl with an expansion ratio of 2,
and a cylindrical furnace of 0.44m diameter.

- The flow Reynolds number was about 50,000 with an inlet vortex of 0.75
swirl number and low turbulence intensity (1%).

- The flow is simulated using a 2d axisymmetric staggered BFC system by means
of the recently-developed GROUND attachment for solving the momentum
equations on 2d BFC staggered meshes with swirl.

- The turbulence is represented by use of the two-equation KE-EP turbulence
model of Chen and Kim [1987].

- A mesh of 28 radial cells by 82 axial cells is used for a computational
domain length of 4m.

Pictures are as follows:

Close up of the computational grid at the furnace entrance

Velocity vectors

Pressure contours

Axial velocity profiles at Z=0.19m

Axial velocity profiles at Z=0.34m

Axial velocity profiles at Z=0.45m

Axial velocity profiles at Z=0.58m

Axial velocity profiles at Z=0.75m

JJS