Flow visualization of the jet exiting a chevron nozzle

Abstract

An experimental investigation has been carried out to visualize the jet development, issuing from chevron nozzles, for a Reynolds number of 25000. Flow visualization was performed by laser illumination on the Titanium Tetrachloride smoke to visualize jet structure at different cross-sections along the jet axis; which was used to study the behavior of the flow development. Pitot pressure measurements were also carried out along the jet centreline in the near-field, to quantify the potential core and characteristic decay of the jets. The flow features reveals that, the non-axisymmetric structure of the jet results in enhanced mixing of the jet. It is also evident from the Pitot measurement that, the reduction in potential corelength is appreciable for both the chevron configurations, implying that the ability of the chevron to break down large scale coherent structures to refine the small-scale mixing of the jet. Moreover, it is also found that the number of the chevron tooth has a pronounced effect on the mixing characteristics.

Experimental Investigation of a Micro Turbojet Engine Chevrons Nozzle by Means of the Schlieren Technique

“…In [23], a visual analysis of the jet development emerging from chevron nozzles at a Reynolds number of 25,000 has been conducted experimentally. To explore the behavior of the flow development, flow visualization using laser illumination on titanium tetrachloride smoke was performed to see the jet structure at various cross-sections along the jet axis [23]. In a different paper, a comparison is made between numerical simulations and those obtained with the Schlieren system for a supersonic jet.…”