Evaluating thermoacoustic properties of heating appliances considering the burner and heat exchanger as acoustically active elements

Abstract

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Advances by the Marie Curie project TANGO in thermoacoustics

“…By comparing the results of these two approaches, they confirmed that the burner and the HEX can be treated as individual network elements as long as the flow field reaches a uniform velocity profile in the region between the flame tip and the HEX. This is in line with the findings by Hosseini et al 94,97 The calculations of the scattering matrix in Strobio Chen et al 92 also revealed that the HEX enhances a pre-existing ITA mode (see section 10.4.1).…”

“…Hydrodynamic interaction. Numerical simulations were conducted by Hosseini et al [94][95][96] to elucidate whether the burner and the HEX can be decoupled and modelled by independent transfer functions. Their numerical domain is shown in Figure 51.…”

“…The transfer function for the HEX (see equation (85)) is defined for a 1D velocity field. By introducing the velocity average over a cross-section at a chosen location between the flame and the HEX, Hosseini et al 94 extended the definition to non-uniform velocity fields. They subsequently calculated the HEX transfer function, with velocity averages taken at different locations.…”

“…(a) Flow distorted by the burner/flame regains its 1D profile upstream of the HEX; flame does not impinge. (b) Flow upstream of the HEX does not regain its 1D profile; flame does not impinge and (c) Flow upstream of the HEX does not regain its 1D profile; flame impinges on the HEX (afterFigure 2in Hosseini et al94 ).…”

“…Gain and phase of the transfer functions for four burner-HEX distances: Y ¼ 10 mm (-), Y ¼ 8 mm (-), Y ¼ 7 mm (-) and Y ¼ 6 mm (-). (a) Transfer function of the burner and (b) Transfer function of the HEX (fromFigures 13 and 14in Hosseini et al94 ).…”