Abstract

The present work investigates a model combustor that approximates a full-scale segment of a high momentum jet stabilised combustion concept with the objective to broaden fuel flexibility limits. The rig features optical access for detailed laser based diagnostics. The current experiments are conducted at a pressure of 8 bar, constant jet velocity and adiabatic flame temperature. Three different injection systems are used to inject oil and oil / water blends. Droplet size distributions and turbulent droplet transport are quantified by means of phase Doppler interferometry. The injection system has a noticeable impact on the droplet size distribution. Water addition affects the fuel placement in radial direction significantly with distinct droplet transport into the reaction zone. The jet core and droplet transport is maintained as far as 7 x/d axial downstream from the nozzle exit. The shear layer shows a turbulent intensity of 12% of the main jet bulk velocity that drives the radial droplet transport into the recirculation zone. Mass flow and number density estimations illustrate the spatial distribution of the liquid loading in the combustion chamber. The present findings are complementary to the work in part A–D, support the development of fuel and load flexible high momentum jets based combustion concepts and the development and validation of numerical models.

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