Accession Number : ADA316512

Title :   Increased Diesel Engine Air Utilization Analysis: Closer to Stoichiometric Combustion.

Descriptive Note : Final rept.,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Matheaus, Andrew C.

PDF Url : ADA316512

Report Date : SEP 1996

Pagination or Media Count : 27

Abstract : Large gains in propulsion system reduction can be achieved by moving closer to stoichiometric combustion in diesel engines. This paper is intended to identify possible fuel injection and combustion strategies to achieve higher diesel engine power density via improved air utilization. The following technology should be addressed for near-term solutions to better air utilization in diesel engines. Utilize high pressure injection equipment that has flexible rate shaping and the smallest possible injector holes. Ideally, fuel injection systems that can control split injections are needed. The appropriate combustion chamber is the quiescent chamber to match the high injection pressures and a shallow combustion bowl. It is necessary to eliminate dead-volumes by moving the top piston ring as close to the crown as possible and reducing the piston-to-cylinder head clearance. If possible, it is advisable to use flush mounted valves and eliminate valve pockets. Increased turbocharger boost would allow smaller engine packaging. Methods to control peak cylinder pressure should be considered. The most promising long-term technology is the Homogeneous Charge Compression Ignition (HCCI) combustion process. Stoichiometric combustion is possible without visible smoke. Further development of this system is necessary for this to be a viable solution.

Descriptors :   *DIESEL ENGINES, *AIR, *COMBUSTION, *FUEL INJECTORS, *UTILIZATION, *STOICHIOMETRY, HIGH POWER, HIGH PRESSURE, REDUCTION, PROPULSION SYSTEMS, HOLES(OPENINGS), HIGH DENSITY, COMBUSTION CHAMBERS, MOUNTS, SPLITTING, INJECTORS, FUEL INJECTION, ENGINE CYLINDERS, SHALLOW DEPTH, FLUSH VALVES, TURBOCHARGERS, COMPRESSION IGNITION, PISTON RINGS.

Subject Categories : Physical Chemistry
      Couplers, Fasteners, and Joints
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Combustion and Ignition
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE