EXPERIMENTAL AND NUMERICAL STUDY OF TURBULENT FLOW CHARACTERISTIC IN ASYMMETRIC DIFFUSER

Yiyin, Klistafani (2017) EXPERIMENTAL AND NUMERICAL STUDY OF TURBULENT FLOW CHARACTERISTIC IN ASYMMETRIC DIFFUSER. International Conference ADRI - 5 "Scientific Publications Towards Global Competitive Higher Education. pp. 285-291. ISSN 978-602-60736-1-7

[img]
Preview
Text
48 Yiyin Klistafani.pdf

Download (626kB) | Preview
[img]
Preview
Text
Front Pages.pdf

Download (328kB) | Preview

Abstract

ABSTRACT Diffuser is one of the constructions that is able to control the behavior of the fluid. Increase in pressure that occurs in the diffuser will generate a positive pressure gradient or collectively the adverse pressure gradient (APG) that affects the development of the boundary layer. The greater APG occurs, the greater the energy needed by the fluid to fight it, because it will lead to separation. One of all factors that strengthen the separation is the divergence angle of diffuser. Numerical analysis is carried out 3D steady-RANS using Fluent 6.3.26 to analyze the characteristics of turbulent flow in the asymmetric diffuser with constant aspect ratio, especially at straight wall. The simulation results compared with experimental results. Experimental studies carried out by measuring the static and stagnation pressure in the test section using static pressure tap and Pitot tube. Reynolds number based on the inlet diffuser height (W 1 ) and the maximum velocity at the inlet diffuser for Re W1 = 8.7 x 10 . Results obtained from experiments and numerical studies on the asymmetric diffuser with constant aspect ratio are SST k-ω is the best model in predicting the pressure coefficient (Cp) while the standard k-ε is the best model in predicting the skin friction coefficient (Cf). Establishment of huge vortex in the diffuser cause Cp value is not maximized. Based on Cf value of the experimental and numerical results, separation doesn’t occur in a straight wall (the bottom wall and rear wall). Key words: asymmetric diffuser, aspect ratio, pressure coefficient

Item Type: Article
Subjects: Q Science > Q Science (General)
Divisions: Department of Mechanical Engineering > Teknik Konversi Energi
Depositing User: Yiyin Klistafani
Date Deposited: 06 Apr 2017 02:16
Last Modified: 06 Jun 2017 08:26
URI: http://repository.poliupg.ac.id/id/eprint/117

Actions (login required)

View Item View Item