A NUMERICAL STUDY ON THE CONTROL OF THE FLOW IN AN AXISYMMETRIC SUDDEN EXPANSION

Yıl 2017, Cilt: 18 Sayı: 2, 484 - 499, 30.06.2017

Kürşad Melih Güleren

https://doi.org/10.18038/aubtda.286567

Öz

A numerical study on the control of the flow and its
characteristics in an axisymmetric sudden expansion have been performed
considering some stability parameters, including velocity profile modification,
wall-shaping, blowing/suction and wall-heating. Due to the fact that numerous
cases were tested, the flow was assumed to be two-dimensional, incompressible
and laminar in order to use computational time feasibly.  The implemented numerical method was
validated with the previous experimental and numerical data. Flow
characteristics regarding the pitchfork-bifurcation, velocity variations,
separation and stain rate relationship, pressure and skin friction coefficients
are examined in detail.  It was seen that
all stability parameters have favourable or adverse effect on the flow
asymmetry. The blowing modification has been found to turn the asymmetric flow
into symmetric flow provided that adequate blowing mass flow is adopted.

Anahtar Kelimeler

Flow control, axisymmetric flow, sudden expansion

Kaynakça

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