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A Rapid Compression Machine For Chemical Kinetics Studies At Elevated Pressures And Temperatures, Gaurav Mittal, Chih-Jen Sung
A Rapid Compression Machine For Chemical Kinetics Studies At Elevated Pressures And Temperatures, Gaurav Mittal, Chih-Jen Sung
Dr. Gaurav Mittal
A rapid compression machine (RCM) has been designed and fabricated for the purpose of chemical kinetics studies at elevated pressures and temperatures. The present RCM is pneumatically driven and hydraulically actuated and stopped. Stroke of the machine varies from 7 to 10 inches and clearance is also adjustable. Compression ratio of up to 21 can be obtained. The optically-accessible reaction chamber is equipped with sensors for the measurements of pressure and temperature. In addition, a rapid sampling apparatus is incorporated in the reaction chamber for determining species concentration at specific post-compression time. A deliberately machined crevice on the cylindrical surface …
Computational Fluid Dynamics Modeling Of Hydrogen Ignition In A Rapid Compression Machine, Gaurav Mittal, Mandhapati Raju, Chih-Jen Sung
Computational Fluid Dynamics Modeling Of Hydrogen Ignition In A Rapid Compression Machine, Gaurav Mittal, Mandhapati Raju, Chih-Jen Sung
Dr. Gaurav Mittal
In modeling a rapid compression machine (RCM) experiment, a zero-dimensional code is commonly used along with an associated heat loss model. However, the applicability of such a zero-dimensional modeling needs to be assessed over a range of accessible experimental conditions. It is expected that when there exists significant influence of the multidimensional effects, including boundary layer, vortex roll-up, and nonuniform heat release, the zero-dimensional modeling may not be adequate. In this work, we simulate ignition of hydrogen in an RCM by employing computational fluid dynamics (CFD) studies with detailed chemistry. Through the comparison of CFD simulations with zero-dimensional results, the …