Indirect noise generated by the acceleration of synthetic compositional and entropic
perturbations through non-isentropic nozzles is measured experimentally. A physics-based …

The acceleration of entropy waves in the turbine stages of aero-engines and gas turbines
produces sound, which can contribute to the feedback mechanism of thermoacoustic …

Thermoacoustic instabilities in can-annular combus-tors of stationary gas turbines lead to
unstable Bloch modes which appear as rotating acoustic pressure waves along the turbine …

Entropy perturbations generate sound when accelerated/decelerated by a non-uniform flow.
Current analytical models provide a good prediction of this entropy noise when the flow …

Broadband combustion noise is a major part of the total noise radiated by modern jet
engines. It comprises two components: direct noise originating from the unsteady heat …

In this work, we investigate both numerically and theoretically the sound generated by
entropy waves passing through sudden area expansions. This is a canonical configuration …

Entropy (temperature) fluctuations produced by turbulent flames generate noise when they
are accelerated by the flow. This so-called entropy noise is an important contributor to core …

Entropy noise corresponds to acoustic fluctuations generated inside gas-turbine engines
when temperature (entropy) spots are accelerated by the mean flow. This type of noise …

This study proposes an alternative and general framework for the assessment of the sound
generated within a combustion chamber. The novel approach is based on Doak's …

Entropy noise remains as a largely unexplored mechanism of combustion generated noise.
Currently, little is known about the production sources of entropy waves in flames. To …