Numerical study on mixing characteristics of symmetrical and asymmetrical twin jets

• Published in: Journal of mechanical science and technology 2023, 37(6), , pp.2981-2991
• Main Authors: Kumar, Ch. Narendra, Sinhamahapatra, K. P.
• Format: Article
• Language: English
• Subjects: Asymmetry; Control; Decay; Dynamical Systems; Engineering; Fluid flow; Industrial and Production Engineering; Jets; Mach number; Mathematical models; Mechanical Engineering; Orientation; Orifices; Original Article; Reynolds number; Turbulence models; Two-equation turbulence model; Vibration; 기계공학
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-023-0524-4

This paper aims to examine the effects of orientation and asymmetry on the mixing characteristics of circular and elliptical twin jets produced from sharp orifices. The twin jets that emerged from two similar orifices are termed as symmetrical twin jets, and the twin jets issued from two different orifices are referred to as asymmetrical twin jets. The twin jets are separated by the spacing ratio of 2, and numerical simulations are performed at a Mach number of 0.8 and a Reynolds number based on an equivalent exit diameter of 3.46×10 5 . RANS-based two-equation turbulence model, namely SST k-ω model was used to carry out the simulations. It was observed that the core length is not affected by the orifice orientation. However, the spread rates and velocity decay are sensitive to orifice orientation, and among the tested twin jet configurations, the circular-elliptical major asymmetrical jet experienced the highest decay and spread rates. In addition, the turbulent intensity peak values of asymmetrical twin jets decreased by 8 % compared to symmetrical twin jets.