Thermoacoustic instability is a flow instability that arises due to a two-way coupling between
acoustic waves and unsteady heat release rate. It can cause damaging, large-amplitude …

Chemical mechanical planarization (CMP) has been widely used in the semiconductor
industry to create planar surfaces with a combination of chemical and mechanical forces. A …

This numerical study investigates the linear and non-linear flame dynamics in the second
stage of a sequential combustor, with methane fuel injection into vitiated hot gas. It focuses …

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 …

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 …

We investigate the low frequency transfer functions for acoustic and entropic perturbations
through nozzles and nozzle guide vanes. Previous theories rely on the isentropic …

Flow disturbances are generated inside a duct via pulsed injection of helium into a flow of
air. This leads to the generation of an acoustic pulse (direct noise), as well as the production …

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