Self-sustained combustion instabilities are one of the most plaguing challenges and
problems in lean-conditioned propulsion and land-based engine systems, such as rocket …

Sound energy harvesting is one of the promising technologies due to the abundant and
clean sound sources. It can be the semi-permanent alternative power supplies for wireless …

In engine combustion systems such as rockets, aero-engines and gas turbines, pressure
fluctuations are always present, even during normal operation. One of design prerequisites …

Highlights•A piezo-tribo MCPP ANG based on porous aerogel bulk is proposed for sound
capture.•PDMS valve simplifies the structure and contributes to flexibility and durability.•An …

An acoustic energy harvester is introduced that uses a quarter-wavelength straight-tube
acoustic resonator with polyvinylidene fluoride (PVDF) piezoelectric cantilever beams …

This work proposes an improved design procedure of sound absorption metamaterials
consisting of acoustic coiled-up quarter-wave resonators that fit into a limited space, in order …

In a thermoacoustic system, such as a flame in a combustor, heat release oscillations couple
with acoustic pressure oscillations. If the heat release is sufficiently in phase with the …

For portable and embedded smart, wireless electronic systems, energy harvesting from the
ambient energy sources has gained immense interest in recent years. Several ambient …

Unwanted combustion instability occurs in many propulsion systems, such as rocket motors,
and aero-engines. It is typically caused by a coupling between acoustic waves and unsteady …

Helmholtz resonators are widely used as acoustic dampers to mitigate noise in gas turbines
and automotive exhaust systems. In order to increase the damping performance and …