Optimal ignition placement in diffusion flames by nonlinear adjoint looping
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Conference Name
Center for Turbulence Research Proceedings of the Summer Program
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Qadri, U., Magri, L., Ihme, M., & Schmid, P. Optimal ignition placement in diffusion flames by nonlinear adjoint looping. Center for Turbulence Research Proceedings of the Summer Program. https://doi.org/10.17863/CAM.35420
Abstract
We derive and implement a gradient-based optimization framework to identify the
best place to ignite a mixture of fuel and oxidizer. We have used the time-averaged in-
crease in thermal energy as the cost function that indicates the success of ignition. We
use direct numerical simulation (DNS) of the low Mach number Navier–Stokes equations
with single-step finite-rate reaction chemistry to model spark ignition of an axisymmetric
methane jet in air.We model the spark as a two-dimensional Gaussian function. We solve
the adjoint of these equations to obtain the sensitivity of the cost function with respect
to the position of the spark. We find that the optimal locations track the stoichiometric
mixture fraction surface in the flow. At low Reynolds numbers, the optimization prefers
locations downstream that allow upstream flame propagation.
Sponsorship
Royal Academy of Engineering (RAEng)
Identifiers
External DOI: https://doi.org/10.17863/CAM.35420
This record's URL: https://www.repository.cam.ac.uk/handle/1810/288105
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