Engineering Commons^™

Cfd Modeling Of Two-Stage Ignition In A Rapid Compression Machine: Assessment Of Zero-Dimensional Approach, Gaurav Mittal, Mandhapati Raju, Chin-Jen Sung

Dr. Gaurav Mittal

In modeling rapid compression machine (RCM) experiments, zero-dimensional approach is commonly used along with an associated heat loss model. The adequacy of such approach has not been validated for hydrocarbon fuels. The existence of multi-dimensional effects inside an RCM due to the boundary layer, roll-up vortex, non-uniform heat release, and piston crevice could result in deviation from the zero-dimensional assumption, particularly for hydrocarbons exhibiting two-stage ignition and strong thermokinetic interactions. The objective of this investigation is to assess the adequacy of zero-dimensional approach in modeling RCM experiments under conditions of two-stage ignition and negative temperature coefficient (NTC) response. Computational fluid …