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Turbulent mixing enhancement with a 10o chute mixer

Ahmed, Mohammed R. and Sharma, S.D. (2005) Turbulent mixing enhancement with a 10o chute mixer. Aircraft Engineering and Aerospace Technology, 77 (5). pp. 404-414. ISSN 0002-2667

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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° 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.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
Depositing User: Ms Mereoni Camailakeba
Date Deposited: 19 Apr 2005 09:37
Last Modified: 09 May 2012 08:17

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