The ranges of operating conditions at which micro-combustors exhibit stable behaviors are very narrow unless a catalyst is employed.
The combustion behavior in these two configurations is compared with that in the original single-wall miniature fuel-film combustor, revealing new aspects that are relevant to portable power generation with high specific energy and power.
In this study, effect of combustor geometric properties on combustion behavior of premixed hydrogen/air mixtures was numerically investigated.
The model was used to assess how the dynamic behavior of the combustor varies with some of the operating parameters.
Moreover, direct integration of the governing equations provided a simulation of the dynamic behavior of the combustor after perturbing the parameters.
First, acoustic behavior in the combustor with a single injector is investigated and acoustic-damping effect of the injector is evaluated for cold condition by the quantitative parameter of damping factor as a function of injector length.
The unsteady behavior of the dump combustor is dominated by extinction due to the high strain rate, while the dynamics of the model afterburner was associated mainly with excitation of pressure fluctuations due to exothermicity and operating conditions.
Proper orthogonal decomposition (POD) of the velocity data showed that each case contained a dynamic helical vortex core (HVC) that rotated around the combustor and greatly affected the flame behavior.
In this study, a simulated engine test rig has been established to evaluate thermal fatigue behavior of a candidate engine combustor material, Haynes 188, under superimposed CO2 laser surface impulsive thermal loads (30 100 Hz) in conjunction with the mechanical fatigue loads (10 Hz).
The objectives of these tests were, firstly to investigate the combustion characteristics of the waste fuels listed above, and secondly to grasp the formation and decomposition behavior of dioxins in the combustor, the cyclone, the convection part and the dust collector, in terms of the isomers of dioxins, respectively, in which the number of chlorine is different from one another.
