TITLE:
Pressure Characteristics Study for the Configuration of Sudden Expansion with Central Restriction and Suction
AUTHORS:
Tridibesh Das, Somnath Chakrabarti
KEYWORDS:
Sudden Expansion, Central Restriction, Reynolds Number, Suction
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.6 No.1,
March
17,
2016
ABSTRACT: In this paper, an extensive numerical study on pressure characteristics in the configuration of
sudden expansion with central restriction and suction has been carried out. During study, Reynolds
numbers (Re) are considered from 50 to 200, suction (S) from 2% to 10% of inlet mass flow,
percentage of central restriction (CR) from 0% to 40% and aspect ratio (AR) from 2 to 6. The effects
of each variable on average static pressure distribution and average stagnation pressure distribution
have been studied in detail. The results have been compared with the configuration of
plain sudden expansion, and sudden expansion with central restriction only. From the study, it is
noted that maximum magnitude of average static pressure rise from throat increases with the increase
in percentage of suction, flow Reynolds number and percentage of central restriction. This
magnitude is higher at lower aspect ratio. Also, it is observed that maximum magnitude of average
static pressure rise from throat is always more in case of suction configuration compared to the
case of configuration of without suction. Average stagnation pressure drop at any section increases
with the increase in percentage of suction and percentage of central restriction, but it decreases
with the increase in Reynolds number. It is noted that higher pressure drop at any section occurs
at higher aspect ratio. This pressure drop at a section is more in case of suction configuration
compared to the case of without suction.