• Dr. Liangyu Wang
  • United Technologies Research Center
  • 1060 Torgersen Hall
  • 10:05 a.m.

The need for predictive simulations of turbulent combustion becomes more and more urgent in practical device design and performance evaluation. In order to achieve predictive simulations, a range of involved physical and chemical phenomena must be taken into account. These phenomena include turbulent transport, finite-rate chemistry, multiphase flow, soot, thermal radiation, and combustion instability and dynamics. Furthermore, the nonlinear interactions among these physical and chemical processes, such as turbulence-chemistry-radiation interactions, must be modeled properly as well. In the first part of this talk various modeling issues in aeroengine combustor simulations will be discussed. As new combustor technologies emphasize on lean premixed combustion to meet more and more stringent emission regulations, modeling and simulations of liquid fuel injection, fuel air mixing in strong turbulent swirling flows, unsteady heat release, and thermal radiation become critical in the design, evaluation, and optimization of new combustor concepts. Research that has been done and recent development in these areas will be described. In the second part of this talk a recent study on the interactions of water mist with fire radiation will be described in detail. Next generation water mist systems are being developed to compete with multi-billion dollar sprinkler industry and to extend to residential markets. Thermal radiation affects vaporization rate of water mist and, therefore, the penetration and transport of water mist. Water mist and water vapor block radiation transfer to the surrounding walls and combustible materials and, therefore, suppress fire growth and spreading. Results from studying a canonical problem are discussed and key physics are identified for the interactions between fire radiations and water mist.