Abstract
Abstract
Highlights
Turbulent jet mixing processes have been a research topic of interest for many years, driven by the many uses of jets in multiple industrial applications
The cold flow data of Feng & McGuirk (2016) for compressible annular shear layer development mentioned in § 2.2 were taken with this nozzle design, and it was adopted for the current measurement programme
Seeding particle lag smears these oscillations in the Laser doppler anemometry (LDA) measurements, estimated in Feng & McGuirk (2016) at approximately 2 % in x/D terms for measured shock locations and resolved shock gradients
Summary
Turbulent jet mixing processes have been a research topic of interest for many years, driven by the many uses of jets in multiple industrial applications. This covers the high subsonic and supersonic exhaust flows occurring in civil (Mj ∼ 0.7–0.9) and military (Mj ∼ 1.0–2.0) aerospace In both applications it is the jet near field which is of interest – approximately the first 15D of plume development (D = nozzle exit diameter). The principal design challenge for the military application is enhancement of near-field jet/ambient mixing rate via letter-box or bevelled nozzle geometries, internal lobed mixers or tabs/fluidic injection mixing devices. The present work describes an experimental study focussed on establishing a coherent understanding of the influence of Mj and NTR/t on the principal parameters characterising jet near-field aerodynamics – shear layer spreading rate (δ ) and potential core length (Lp).
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