Tribological Phenomena for Advanced Diesel Engines

Military and commercial applications of future engines require a reduction in the time consuming and costly experimental research, testing, and development currently necessary. One method of reducing the time required for design of new systems, whileensuring the critical performance standards necessary for military operations, is to develop numerical simulations of cylinder-kit dynamics. These simulations will lead to the comprehension necessary to design a proper balance between the good sealingrequired for optimum performance and a high reliability, while simultaneously maintaining low friction and low wear. The Phase II technical effort includes verification of the predicted cylinder-kit kinematics and fluid transport using firing engine datafrom engines of interest and flow studies in an optical engine. Submodels of CASE will then be examined and improvements made where necessary. The final task of Phase II will deal with the commercialization aspects of the CASE System. This task willencompass the preparation of a book to describe the models and submodels implemented in the CASE System. An executable student version of the CASE System will be included as part of the purchase price of the book. This will stimulate the development of newcylinder-kit systems by providing a design tool, which at present is not readily available worldwide to large groups of engineers and students. The tribological research to be conducted in the Phase II effort is highly relevant to advanced diesel engines,for both the commercial and the military sector. The critical performance tradeoffs of diesel engine fuel economy, performance, durability, oil consumption, smoke, and other considerations, cannot currently be made without huge expenditures of time andmoney. A scientifically based engineering approach is being developed to serve as a guide to the advancement of higher power, density diesel engines. The numerical simulation, proposed to be further developed and verified in this Phase II project, offersthe possibility of not only improving diesel engine designs, but also significantly reducing the cost of these improvements. In addition to developing an advanced simulation tool that can be used by engine designers, the work conducted during this effortwill provide significant experimental verification of the models implemented in the CASE System, stimulating further confidence in its usefulness.