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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7795

Title: Turbulent mixing enhancement with a 10 degrees chute mixer
Authors: AHMED, MR
SHARMA, SD
Keywords: central-lobed mixer
coaxial jets
velocity-measurements
flow
Issue Date: 2005
Publisher: EMERALD GROUP PUBLISHING LIMITED
Citation: AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, 77(5), 404-414
Abstract: Purpose - Turbulent mixing of two co-axial jets having a low annular to core area ratio is enhanced by employing a chute mixer directing part of the annular stream at 10 degrees towards the core region. Aims to present results from measurements of time-averaged and fluctuating components of velocity under cold flow conditions, Design/methodology/approach - Experiments were conducted at a bypass ratio of 0.47 which is a typical value for low bypass turbofan engines. Contours of time-averaged velocity and streamwise and transverse turbulence intensities were obtained by making detailed measurements close to the chutes. Distributions of time-averaged velocity and turbulence intensity were obtained at different axial locations downstream of the chute mixer. Total and static pressure measurements were also performed. Findings - The high velocity annular stream was found to quickly diffuse after entering through the chutes and mix with the core stream due to high turbulence generation. A strong transverse turbulence component enhanced the mixing of the streams. With the aid of the chute mixer, nearly complete mixing is achieved over a length of 5 duct radii. A higher total pressure loss of about 1.38 percent is the penalty paid for the enhanced mixing. Originality/value - Provides results from experiments into the process of turbulent mixing of co-axial jets.
URI: http://dx.doi.org/10.1108/00022660510617149
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7795
http://hdl.handle.net/10054/7795
ISSN: 0002-2667
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