Abstract
The presented work addresses the investigation of the heat loss of a confined turbulent jet flame in a lab-scale combustor using a conjugate-heat transfer approach and large-eddy simulation. The analysis includes the assessment of the principal mechanisms of heat transfer in this combustion chamber: radiation, convection and conduction of heat over walls. A staggered approach is used to couple the reactive flow field to the heat conduction through the solid and both domains are solved using two implementations of the same code. Numerical results are compared against experimental data and an assessment of thermal boundary conditions to improve the prediction of the reactive flow field is given.
Highlights
Heat transfer is a key issue to evaluate the overall performance and life duration of practical combustion systems
The effect of different heat transfer mechanisms and thermal conditions for the chamber walls of a turbulent jet flame configuration is investigated in detail by means of numerical simulations
The study presents a novel methodology based on a Dual Heat Transfer (DHT) approach in combination with RANS turbulence treatment to compute steady fields at the fluid–solid interface
Summary
Heat transfer is a key issue to evaluate the overall performance and life duration of practical combustion systems. One of the main applications of aerothermal engineering is the design and development of propulsive systems such as Gas Turbines (GT) or Internal Combustion Engines (ICE). In such devices, the existence of heat losses influences the local gas temperature of the reacting layers affecting the kinetics of the reactions and the formation of pollutants. The turbine inlet temperature is one of the key parameters to increase the thermodynamic efficiency [2,3], so improvements in the turbine blade cooling techniques and metallurgical advances contribute to the overall engine performance. With increasing turbine inlet temperatures, the accurate description of heat transfer in the
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