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Methodology To Account For Multi-Stage Ignition Phenomena During Simulations Of Rcm Experiments, S. Goldsborough, Gaurav Mittal, C. Banyon
Methodology To Account For Multi-Stage Ignition Phenomena During Simulations Of Rcm Experiments, S. Goldsborough, Gaurav Mittal, C. Banyon
Dr. Gaurav Mittal
RCM experiments are used to investigate the ignition behavior of fuels at engine relevant conditions. Modern designs utilize pistons with crevice volumes machined around the circumference of the crown in order to suppress boundary layer effects during the volumetric compression process. While piston crevices have been successful in controlling heat loss from the reaction chamber gases and improving the overall homogeneity of the reacting mixture, multi-stage ignition events can be sufficiently perturbed by spatial non-uniformities and there can be substantial gas flow into the crevice volume due to the preliminary, or low-temperature heat releases. Ignition delay times can be lengthened …
A Computationally Efficient, Physics-Based Model For Simulating Heat Loss During Compression And The Delay Period In Rcm Experiments, S. Goldsborough, Colin Banyon, Gaurav Mittal
A Computationally Efficient, Physics-Based Model For Simulating Heat Loss During Compression And The Delay Period In Rcm Experiments, S. Goldsborough, Colin Banyon, Gaurav Mittal
Dr. Gaurav Mittal
A computationally efficient, physics-based model is developed to account for the heat loss that occurs during the compression process and delay period in rapid compression machine (RCM) experiments. The model is formulated using multiple zones (MZs) and accounts for conductive losses in the main reaction chamber as well as convective losses in the piston crevice and ringpack regions. Blowby past the piston ringpack is also considered. The loss terms can be incorporated into the widely-utilized ‘adiabatic core’ model in order to perform ‘volumetric expansion’ calculations during chemical kinetic simulations that correct for pressure and temperature reductions resulting from these energy …