The entropy wave generation in a heated one-dimensional duct

On the dispersion of entropy waves in turbulent flows

“…Our work follows a number of experimental and numerical investigations dealing with the generation of entropy waves (e.g. Wang et al 2019;Yoon 2020), with their contribution to the instabilities (e.g. Eckstein & Sattelmayer 2006;Schulz et al 2019) and with their measurements (Wassmer et al 2017;De Domenico et al 2019).…”

“…Wang et al. 2019; Yoon 2020), with their contribution to the instabilities (e.g. Eckstein & Sattelmayer 2006; Schulz et al.…”

Scattering of entropy waves into sound by isolated aerofoils

“…Karimi, Brear & Moase (2008) showed that one-dimensional, non-diffusive flows with heat communication behave as low-pass filters when excited by an unsteady heat release rate: an effective cutoff frequency exists, below which significant entropy generation occurs and above which entropy generation diminishes. Yoon (2020) found that the entropic cutoff frequency is inversely proportional to the flame residence time. Entropy generation has been the subject of recent investigations using low-order models (Chen, Bomberg & Polifke 2016), numerical simulations (Semlitsch et al.…”

Dynamics of entropy wave generation in a simplified model of gas turbine combustor: A theoretical investigation

“…Under the assumption of linearity, this is provided by a transfer function, which relates the production of entropy waves to various flow disturbances. In a recent theoretical study, Yoon [58] analytically derived such transfer function immediately downstream of the flame. Importantly, however, only non-chemical sources under Eulerian flow assumptions were considered in that work [58].…”