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

Tunable diode laser absorption spectroscopy (TDLAS) with wavelength modulation
spectroscopy (WMS) has been widely applied to measure the gas temperature and species …

Predicting and controlling entropy-wave-driven combustion instabilities is challenging,
because the production, advection and dispersion of entropy waves in practical systems is …

Recent models and experiments have demonstrated that indirect noise can be generated
via acceleration of either entropic or compositional perturbations through a nozzle. These …

A tube with both ends open and a heat source placed inside form a simplest thermoacoustic
device: the Rijke tube. This present work introduced the experimental results for optical …

Indirect combustion noise, as an important source of noise in gas turbines, was traditionally
attributed solely to entropy waves. In recent years, compositional waves were introduced as …

Entropy noise induced by hot spots (entropy waves) is the least explored mechanism of
combustion generated sound. Emission of entropy noise is subject to convection of entropy …

This work shows the first application of a burst laser for laser-induced grating spectroscopy
(LIGS) diagnostics. High repetition rate (100 kHz) LIGS is performed in non reacting and …

Climate change and global warming, significantly caused by greenhouse gas emissions
from human activities, pose various serious problems, including negative impacts on health …

Shock wave interactions are important in a variety of engineering applications, ranging from
gas turbines to rocket nozzles. There is much discussion regarding the sources of …