Progress and recent trends in homogeneous charge compression ignition (HCCI) engines

Computational fluid dynamic (CFD) simulations that include realistic combustion/emissions chemistry hold the promise of significantly shortening the development time for advanced high-efficiency, low-emission engines. However, significant challenges must be overcome to realize this potential. This paper discusses these challenges in the context of diesel combustion and outlines a technical program based on the use of surrogate fuels that sufficiently emulate the chemical complexity inherent in conventional diesel fuel. The essential components of such a program are discussed and include: (a) surrogate component selection; (b) the acquisition or estimation of requisite elementary chemical kinetic, thermochemical, and physical property data; (c) the development of accurate predictive chemical kinetic models, together with the measurement of the necessary fundamental laboratory data to validate these mechanisms; and (d) mechanism reduction tools to render the coupled chemistry/flow calculations feasible. In parallel to these efforts, the need exists to develop similarly robust models for fuel injection and spray processes involving multicomponent mixtures of wide distillation character, as well as methodologies to include all of these high fidelity submodels in computationally efficient CFD tools. Near- and longerterm research plans are proposed based on an application target of premixed diesel combustion. In the near term, the recommended surrogate components include n-decane, iso-octane, methylcyclohexane, and toluene. For the longer term, n-hexadecane, heptamethylnonane, n-decylbenzene, and 1-methylnaphthalene are proposed.

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Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Fuel design and management for the control of advanced compression-ignition combustion modes

Evolution, challenges and path forward for low temperature combustion engines

Impact of low temperature combustion attaining strategies on diesel engine emissions for diesel and biodiesels: A review

Effects of injection angles on combustion processes using multiple injection strategies in an HSDI diesel engine

Emissions Characteristics of Neat Butanol Fuel Using a Port Fuel-Injected, Spark-Ignition Engine

Two experiments are described that have been developed to demonstrate the fundamentals of unsteady, compressible flow. The experiments involve the discharge of gas from a pressurized vessel and the filling of an initially evacuated vessel. The hardware, software, and procedures for the experiments are summarized. In addition, theoretical solutions for the entire vessel filling and discharge process (choked and unchoked operation) are developed using both adiabatic and isothermal models of the processes. Example measurements from the discharge and filling experiments are presented and compared to the adiabatic and isothermal theories. The data are found to agree well with the theoretical predictions and follow the expected trends with respect to the rapidity of the processes.

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Robert E. Coverdill

Papers

Effects of injection angles on combustion processes using multiple injection strategies in an HSDI diesel engine

Emissions Characteristics of Neat Butanol Fuel Using a Port Fuel-Injected, Spark-Ignition Engine

Experiments to Study the Gaseous Discharge and Filling of Vessels

Smokeless Combustion within a Small-Bore HSDI Diesel Engine Using a Narrow Angle Injector

Low Temperature Combustion within a Small Bore High Speed Direct Injection (HSDI) Diesel Engine