Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh

ICME09-FM-35

EXPERIMENTAL STUDY OF THERMALLY STRATIFIED
CO-AXIAL JETS WITH TRIP RING EXCITATION
 

M. A. T. Ali and Sukanta Bhattacharjee
Dept. of Mechanical Engineering, Bangladesh University of Engineering & Technology,
Dhaka, Bangladesh

ABSTRACT

The experimental investigation of thermally stratified coaxial jet with trip ring excitation is presented. Isothermal as well as thermally stratified or non-isothermal co-axial jet flows are developed by issuing two jets with different unidirectional velocities from a concentric compound nozzle. Enhanced mixing of coaxial free jets of different temperature and different velocity ratio is achieved with the help of vortex generation influenced by inner and outer trip ring placed around the central nozzle. The spatio-temporal velocity fields along with the temperature of the jets are studied by a pitot-static tube with an embedded thermocouple and a high-resolution pressure transducer. The inner dynamic and thermal potential core lengths become much shorter, and mixing between the inner and the outer fields is markedly enhanced by the wake produced after introducing the trip rings. Among the different combinations inner trip ring is found most efficient in mixing non-isothermal co-axial jets.
 

Keywords: Non-Isothermal, Coaxial Jets, Trip Ring, Potential Core.

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