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NUMERICAL AND EXPERIMENTAL INVETIGATIONS OF THE NOZZLE GEOMETRY IN SUPERSONIC MIXING.

Sumesh V., Rahul S. Arackal, P. Balachandran, Z. A. Samitha, Fazil Mohammad

Effective mixing of two supersonic streams in a short mixing chamber is a major challenge. Active and passive methods are used to enhance the mixing. Nozzle geometry, different nozzle configurations a concept of passive method, considered in this paper to enhance the mixing. In this paper, both numerical and experimental investigation of oval nozzles presented. Mixing performance was studied for selected oval nozzles and the oval geometry is varied by changing the aspect ratios of 1:2, 1:3 and 1:4. A mixing tube with an aspect ratio (L/D) of 4 was used to assess the mixing performance. The performance parameters such as momentum flux, degree of mixing and stagnation pressure loss are used to analyze the study. Among three different geometries, the oval nozzle with an aspect ratio of 1:3 showed the highest performance.