The document describes a prototype confined jet in hot coflow (JHC) burner designed to study MILD combustion of liquids at high pressure. The burner consists of a main combustor where a fuel jet issues into a hot coflow from an independently controlled preliminary burner. It has one optical grade quartz window for visualization and is made of stainless steel, with plans to convert it to thicker materials for higher pressure operation. Future work involves further commissioning, introducing liquid fuels, diagnostics, and characterization for safe high pressure operation.

1. Prototype confined jet in hot coflow burner
Paul Medwell1
, Michael Evans1
, Zhao Tian1
, Shaun Chan2
, Alessio Frassoldati3
, Alberto Cuoci3
, David Bluck4
, Mel Roquemore5
1
University of Adelaide, 2
University of New South Wales, 3
Politecnico di Milano, 4
Oregon State University, 5
Air Force Research Laboratory
1. Background and Aims
 Build a prototype confined jet in hot coflow (JHC) burner for
the study of MILD combustion of liquids at high pressure
2. Design Concept
3. Photographs of Operation 4. Preliminary Demonstration
 Flame photographs and CH* imaging
6. Future Work
 Continue commissioning to demonstrate proof-of-principle
 Larger size and number of windows
 Cooling of central fuel pipe and introduction of liquid fuels
 Translation of measurement location
 Fully characterise boundary conditions
 More comprehensive material and design analysis for safe
operation at high-pressure conditions
 Detailed experimental campaign including laser diagnostics
7. Acknowledgements
 Australian Research Council (ARC), Santos Pty Ltd and
United States Air Force (AOARD) for funding support
For more details: paul.medwell@adelaide.edu.au
PreliminaryburnerMaincombustor
Window
Main combustor
 Fuel jet issues into hot coflow from
preliminary burner
 Jet in hot coflow configuration
 Jet flame controlled independently
from oxidant stream
 Currently simple jet pipe, but easy
change-over to other injectors
 Stainless steel duct for prototype,
to be converted to thicker tube for
operation at higher pressure
 Diameter = 200mm, length = 1.3m
Window
 One optical grade quartz window
 50mm diameter, 21mm thick
 Mounted in pane assembly with
high-temperature seals to facilitate
thermal expansion
Preliminary burner
 Difficult to control flashback in pre-
mixed preliminary burners used in
previous JHC-style burners
 Air injected from the bottom
 Partially premixed fuel/air mixture
introduced through ring burners
 Wide range of operating conditions
 Various baffle-plates installed to
help provide uniform laminar flow