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Interpretation Of Experimental Data From Rapid Compression Machines Without Creviced Pistons, Gaurav Mittal, Mickael Chromier
Interpretation Of Experimental Data From Rapid Compression Machines Without Creviced Pistons, Gaurav Mittal, Mickael Chromier
Dr. Gaurav Mittal
Over the last two decades, experimental data of the nature of species evolution profiles and ignition delays from rapid compression machines (RCMs) has been used to develop and validate chemical kinetic mechanisms at low-to-intermediate temperatures and elevated pressures. A significant portion of this overall dataset is from RCMs that had not employed a creviced piston to contain the roll-up vortex. The detrimental influence of the roll-up vortex and the thermokinetic interactions due to the resulting temperature non-homogeneity during the negative temperature coefficient (ntc) regime have been documented in the literature. However, the adequacy of the homogeneous modeling of RCMs without …
Vortex Formation In A Rapid Compression Machine: Influence Of Physical And Operating Parameters, Gaurav Mittal, Mandhapati Raju, Chih-Jen Sung
Vortex Formation In A Rapid Compression Machine: Influence Of Physical And Operating Parameters, Gaurav Mittal, Mandhapati Raju, Chih-Jen Sung
Dr. Gaurav Mittal
The performance of a rapid compression machine (RCM) with a creviced piston is assessed over a range of operating conditions through computational fluid dynamics simulations with systematic demonstration of the effects of compressed gas pressure, temperature, stroke length, and clearance on altering vortex formation and temperature homogeneity inside the reaction chamber. Simulated results show that as compressed gas pressure is reduced, the temperature homogeneity deteriorates due to the combined effect of thicker boundary layer and increased flow velocities. A further optimization of the creviced piston geometry is then required to completely suppress the roll-up vortex. Stroke length and clearance volume …