Theoretical and Experimental Investigation of the Operating Characteristics of a Helmholtz Type Pulse Combustor due to Changes in the Inlet Geometry

LES of combustion dynamics in a pulse combustor

“…In fact, it was reported earlier that even a slight change of the inlet geometry can have strong effect on the performance. 7 Nevertheless, the ability of the present simulation model to capture even subtle changes in flow and geometrical parameters provides some confidence that this simulation tool may be useful to study design of pulse combustors even at the small scale.…”

“…The initial geometry used for validation is nearly identical to the one used in earlier experiments and simulations by Moller et al 7 This pulse combustor is a Helmholtz-type device with a flapper valve. Fuel and air are premixed before they enter the combustion chamber.…”

“…To validate the present model, simulations were carried for the test configuration described earlier 7 for which data is available for validation. Fig.…”

Pulse Combustion Characteristics of Various Gaseous Fuels

“…Much research has been carried out to investigate pulse combustion mechanisms. – Among them, numerical methods play an important role. For example, Neumeier et al analyzed a Helmholtz type combustor in the frequency domain creating the pulse combustor as a feedback system .…”

“…The inlet valves, when opened, were considered as orifices of a given cross section, and a characteristic pressure drop curve was used to define the relationship between the velocity and the pressure changes across the valves. Möller and Lindholm examined the effects of inlet geometry change using a large eddy simulation (LES) in a commercial CFD code, and a similar model was applied by Tarjiri and Menon to investigate the combustion dynamics of a pulse combustor . The CFD models can provide detailed information inside the combustor including flame structure, gas dynamics, and so forth, which contribute to improving our understanding of pulse combustion.…”