Liquid Fuel Vaporization Process Built Inside Wankel Rotary Engines ACENT Laboratories

Format:

Conference/Event

Author/Creator:

Trucco, Trucco, author.

Conference Name:

21st SAE Brasil International Congress and Exhibition (2012-10-02 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The purpose of this paper is to describe a novel liquid fuelconditioning process that is incorporated within a Wankel typerotary engine. The process takes place inside three smallvaporization chambers attached to the engine rotor. After aninjected liquid fuel has evaporated and superheated inside avaporization chamber, it is transferred via a transfer port into amoving chamber near the middle of a compression phase to form astratified mixture with a prevailing fresh air charge. Combustionis triggered by a spark. Near the end of an expansion phase hotcombustion products enter the vaporization chamber via anentrapment portrait Thereafter, those products are entrapped insidethe vaporization chamber during about 180° of rotor rotation.Unlike spark ignition, compression ignition or homogeneouscharge compression ignition engines, here the liquid fuel isinjected into the vaporization chamber during the exhaust phase ofa preceding cycle. Fuel droplets absorb heat from the hot entrappedcombustion products and vaporization chamber walls, where theyevaporate and reach a superheated gaseous state. Calculationspredict that the residence time available inside a typicalvaporization chamber of an engine running at 7,000 RPM issufficient to evaporate and superheat diesel fuel droplets of 100micron SMD.It is anticipated that this novel concept could substantiallyreduce the untreated emission levels of nitrogen oxides, carbonmonoxide, particulate matter and unburned hydrocarbons whencompared to contemporary Wankel type rotary engines. Thisprojection implies that less costly and simpler after-treatmentdevices will suffice to comply with emission standardregulations.An improvement in engine fuel economy is expected because: (1)efficient and stable stratified combustion process, (2) unthrottledoperation and (3) faster heat release rate than that correspondingto present-day Wankel type rotary engines.The moving chamber exhibits an over-elongated contour thatdevelops while it is rotating around top dead center whose geometryallows running on much lower octane rated gasoline than acomparable piston engine. Also, because the fuel is vaporized,diesel knocking is prevented and therefore the fuel does not needto be rated for high-octane or cetane numbers. This feature allowsthe engine to efficiently employ gasoline or diesel fuels withoutadditives or blends. Additionally, the system is expected toeffectively utilize low-cost petroleum-derived fuel, biodiesel andvegetable oil

Notes:

Vendor supplied data

Publisher Number:

2012-36-0124

Access Restriction:

Restricted for use by site license