Transonic Combustion - A Novel Injection-Ignition System for Improved Gasoline Engine Efficiency Transonic Combustion Incorporated

Format:

Conference/Event

Author/Creator:

De Boer, De Boer, author.

Contributor:

Chang, Junseok

Shetty, Shreeram

Conference Name:

SAE 2010 Powertrains Fuels & Lubricants Meeting (2010-10-25 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Spark ignition gasoline engine efficiency is limited by a numberof factors; these include the pumping losses that result fromthrottling for load control, spark ignition and the slow burn ratesthat result in poor combustion phasing and a compression ratiolimited by detonation of fuel. A new combustion process has beendeveloped based on the patented concept of injection-ignition knownas Transonic Combustion or TSCi; this combustion process isbased on the direct injection of fuel into the cylinder as asupercritical fluid. Supercritical fuel achieves rapid mixing withthe contents of the cylinder and after a short delay periodspontaneous ignition occurs at multiple locations. Multipleignition sites and rapid combustion combine to result in high ratesof heat release and high cycle efficiency. The injection-ignitionprocess is independent from the overall air/fuel ratio contained inthe cylinder and thus allows the engine to operate un-throttled.Additionally, the stratified nature of the charge under part loadconditions reduces heat loss to the surrounding surfaces, resultingin further efficiency improvements. The short combustion delayangles allow for the injection timing to be such that the ignitionand combustion events take place after TDC. This late injectiontiming results in a fundamental advantage in that all workresulting from heat release produces positive work on the piston.Other advantages are the elimination of droplet burning andincreased combustion stability that results from multiple ignitionsources.Engine test results are presented over a range of speed, loadand operating conditions to show fuel consumption, emission andcombustion characteristics from initial injector and combustionsystem designs. The results are correlated with thermo-dynamicmodeling and comparisons are made with contemporary engines

Notes:

Vendor supplied data

Publisher Number:

2010-01-2110

Access Restriction:

Restricted for use by site license