Please choose your delivery country and your customer group
Modern oil-burner-technology is often characterised by pre-mixed flames. These burners have a recirculation flow which provides a homogeneous mixture of fuel and air and achieve a reduction in NO(X)-emissions. Unfortunately along with this there may be an increasing noise emission especially with compact chamber constructions. The noise emission of oil-fired burners in combustion chambers sometimes results in selfexcited oscillations. One possible reason for those oscillations which mainly occur in small oil-fired heating systems is a system instability, often termed chugging. An oscillation of this type involves the entire heating system: burner and its flame, combustion chamber and chimney. System instability is characterised by a low frequency so the wavelength is usually large compared to the dimensions of each component in the system. Work was carried out to examine why pre-mixing oil burners may excite heating systems and which parameters influence the combustion oscillation.