Transonic Combustion: Model Development and Validation in the Context of a Pressure Chamber Transonic Combustion Incorporated

Format:

Conference/Event

Author/Creator:

Hossain, Hossain, author.

Contributor:

Boer, Chris de

Qiu, Jian

Shetty, Shreeram

Zoldak, Philip

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Transonic Combustion or TSCi is a novel combustion processbased on the patented concept of injection-ignition of fuel. Theprocess takes advantage of the improved mixing properties ofsupercritical fuel to achieve high yet controlled rates of heatrelease and high cycle efficiency. However, there is little sciencethat documents the mixing process, ignition characteristics andcombustion behavior of gasoline-like fuels in supercriticalconditions, let alone the fluid transport properties. Thus,experimental studies and modeling efforts are necessary to enhanceunderstanding of this combustion process and for effectivedevelopment of this technology.This paper focuses on the model development and validationefforts for TSCi in an optical pressure chamber. An opticallyaccessible pressure chamber was used to study the combustion of aninjection-ignited supercritical fuel. Chemistry and ComputationalFluid Dynamics (CFD) models were developed to simulate TSCi andwere validated against data from the pressure chamber. This paperfocuses on the validation efforts for supercritical n-heptaneinjected at different pressures. The comparison metrics encompassedfluid jet penetration, ignition delay and lift-off length.A reduced chemistry model for n-heptane was developed for thesupercritical regime. The reduction process included sensitivitystudies, to match ignition delay timing to results from shock-tubeexperiments available in literature. The chemistry model wasimplemented in a transient three-dimensional CFD simulation. Thesimulation results were then validated against data from thepressure chamber and the penetration rate, ignition delay andlift-off-length compared well with the experimental data

Notes:

Vendor supplied data

Publisher Number:

2012-01-0155

Access Restriction:

Restricted for use by site license