COMPARISON OF FLOW FIELD BETWEEN STEADY AND UNSTEADY FLOW OF AN AUTOMOTIVE MIXED FLOW TURBOCHARGER TURBINE
File(s)
Published version
Author(s)
Padzillah, MH
Rajoo, S
Martinez-Botas, RF
Type
Journal Article
Abstract
Global decarbonizing efforts in transportation industry have forced the automotive manufacturers to opt for highly downsized high power-to-weight ratio engines. Since its invention, turbocharger remains as integral element in order to achieve this target. However, although it has been proven that a turbocharger turbine works in highly pulsatile environment, it is still designed under steady state assumption. This is due to the lack of understanding on the nature of pulsating flow field within the turbocharger turbine stage. This paper presents an effort to visualize the pulsating flow feature using experimentally validated Computational Fluid Dynamics (CFD) simulations. For this purpose, a lean-vaned mixed-flow turbine with rotational speed of 30000 rpm at 20 Hz flow frequency, which represent turbine operation for 3-cylinder 4-stroke engine operating at 800 rpm has been used. Results indicated that the introduction of pulsating flow has resulted in more irregular pattern of flow field as compared to steady flow operation. It has also been indicated that the flow behaves very differently between pressure increment and decrement instances. During the pressure decrement instance, flow blockage in terms of low pressure region occupies most of the turbine passage as the flow exit the turbine.
Date Issued
2016-06-15
Date Acceptance
2016-06-15
Citation
Jurnal Teknologi, 2016, 78 (8-4), pp.1-7
ISSN
0127-9696
Publisher
Penerbit UTM Press
Start Page
1
End Page
7
Journal / Book Title
Jurnal Teknologi
Volume
78
Issue
8-4
Copyright Statement
© 2016 Penerbit UTM Press. All rights reserved
Sponsor
Universiti Teknologi Malaysia
Grant Number
N/A
Subjects
Science & Technology
Technology
Engineering, Multidisciplinary
Engineering
Mixed-flow turbine
computational fluid dynamics
pulsating flow
Publication Status
Published