Computational investigation of flow fields and detailed chemistry impacts on ignition delays

Ritter, David B.

Title:

Computational investigation of flow fields and detailed chemistry impacts on ignition delays

dc.contributor.advisor	Sun, Wenting
dc.contributor.author	Ritter, David B.
dc.contributor.committeeMember	Genzale, Caroline
dc.contributor.committeeMember	Lieuwen, Timothy
dc.contributor.committeeMember	Sankaran, Vaidya
dc.contributor.department	Mechanical Engineering
dc.date.accessioned	2020-09-08T12:48:04Z
dc.date.available	2020-09-08T12:48:04Z
dc.date.created	2020-08
dc.date.issued	2020-07-27
dc.date.submitted	August 2020
dc.date.updated	2020-09-08T12:48:04Z
dc.description.abstract	This work investigated the impacts of a complex piston head geometry on the aerodynamics and chemical kinetics in a Rapid Compression Machine. Utilizing 2D axisymmetric Computational Fluid Dynamics, a single stage compression and ignition was simulated for three different piston head geometries. The numeric framework resolved the flow structures through a hybrid RANS–LES model, and simulated the reaction with a diluted 29 species, 52 equation reduced global mechanism for n-heptane. The hybrid viscosity model was found to provide excellent qualitative information regarding the aerodynamic structures within a reasonable run time. Differences across geometry in vortex formation and interaction with the piston is presented. Negligible differences in global temperature or ignition delay were observed for the different piston geometries. The variable piston geometry was found to highly impact the cold roll up vortex, alter the chemical reaction pathways and acoustic resonance in the fluid domain. Geometric features were identified as possible alternative solutions to vortex mitigation compared to other strategies currently used in RCMs.
dc.description.degree	M.S.
dc.format.mimetype	application/pdf
dc.identifier.uri	http://hdl.handle.net/1853/63672
dc.language.iso	en_US
dc.publisher	Georgia Institute of Technology
dc.subject	RCM
dc.subject	Ignition delay
dc.subject	Cold roll up vortex
dc.title	Computational investigation of flow fields and detailed chemistry impacts on ignition delays
dc.type	Text
dc.type.genre	Thesis
dspace.entity.type	Publication
local.contributor.advisor	Sun, Wenting
local.contributor.corporatename	George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename	College of Engineering
relation.isAdvisorOfPublication	7d9d0509-69ed-4692-be79-1d8fd8325ac6
relation.isOrgUnitOfPublication	c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication	7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level	Masters