NUMERICAL INVESTIGATION

In this work a part of the results from experimental investigation of pulsating combustion with application on boiler model are presented. The Helmholtz-type water-cooled pulse combustor consists of a combustion chamber, a resonant pipe and aero-dynamic intake valves supplying air needed for combustion. Inside the boiler model a bundle of tubes is mounted representing one of the convective parts of the boiler. In case when the tube bundle is in upper position, the bottom of the boiler model represents the fire-place. Application of the pulse combustion burner on the boiler model refers basically to two zones: the fire-place and the convective part of the boiler. The laboratory experiments showed: weakening of the generated pressure pulsations of the exhaust gases on the boundary between burner and the interior of the boiler model; weakening of pressure pulsations in the free space of the boiler model; weakening of pressure pulsations during propagation through the tube bundle; impacts of the pulsating flow of the exhaust gases and generated sound energy on the walls of the boiler model.The experimental work is supported with numerical investigation of the pulsating combustion process. Combustion models included in FLUENT program package are used for calculations. It is shown that results from simulation are in good agreement with experiment. Key words: burner, pulse combustion, boiler model, sound energ