The purpose of this work is to stress the importance of unsteady characterization of turbulent flames to improve knowledge of turbulent combustion physics and develop control strategies. Both numerical and experimental analysis are considered. Numerical contribution of Large Eddy Simulation is examined: qualitatively, from the view point of phenomenology, and quantitatively, from the view point of kinetic energy spectra. Behaviour of these spectra associated to combustion is explained theoretically by deriving a transport equation for kinetic energy including the effect of thermal energy. Experimental contribution is focused on the application of optical sensors, and in particular photo-diodes or photomultipliers. It is shown that chemiluminescence spectra have the characteristic slope k-5/3of a turbulent passive scalar like temperature; this scaling is analytically justified assuming that ñame radiation obeys to the Planck spectral black body function. Analysis of these spectra includes comparison with kinetic energy spectra obtained by means of LES and shows that chemiluminescence can be used to investigate turbulence - chemistry interaction; furthermore, it can be used to reveal combustion instabilities, both fluid-dynamic and thermo-acoustic, eventually bringing to flame blowout. The analysis performed in real time and the structural features of photo-diodes let to use these optical devices in control systems for aero- and space- engines. copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
|Publication status||Published - 2005|
|Event||41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit - , United States|
Duration: 1 Jan 2005 → …
|Conference||41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit|
|Period||1/1/05 → …|
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Control and Systems Engineering
- Electrical and Electronic Engineering
Giacomazzi, E., Bruschi, R., Giammartini, S., Giulietti, E., Manfredi, F., Stringola, C., ... Troiani, G. (2005). Experimental and numerical unsteady characterization of turbulent combustion. Paper presented at 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, United States.