Date of Award
Mechanical, Automotive, and Materials Engineering
Applied sciences, Combustion, Homogeneous charge compression ignition, Turbulent flows
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Homogeneous Charge Compression Ignition (HCCI) engines have the potential to achieve higher thermal efficiency and lower emissions compared with conventional Internal Combustion (IC) engines. However, the organization of HCCI engine combustion is extremely critical in order to take advantage of HCCI combustion.
In this dissertation, an integrated numerical solver (named CKL solver) has been developed by integrating the original KIVA-3V solver with CHEMKIN and Large Eddy Simulation. This integrated solver has been validated by comparing the numerical results with the available experimental results, and has been employed to evaluate the combustion performance of the innovative HCCI combustion strategy with the Internal Mixing and Reformation (IMR) chamber that was proposed in the present study.
The results show that: (1) the CKL solver can provide detailed information on HCCI combustion in terms of turbulent flow structures, temperature fields, concentration fields of all species involved including emissions (NO x, CO, HC), engine performance (indicated mean effective pressure (IMEP), heat release rate (HRR), thermal efficiency), and spray-flow interactions. (2) the CKL solver predicts the averaged pressure, IMEP, thermal efficiency, emissions and HRR which are in good agreement with corresponding experimental data, proving that the CKL solver can be applied to practical engineering applications with the accuracy, depending on the intake temperature values, for IMEP of 5-10%, and for peak pressure of 1-7.5%. (3) the functions of the IMR chamber have been demonstrated and evaluated, showing that the IMR technology is a promising combustion strategy and needs further investigation in the future.
Jonnalagedda, Srikanth, "Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics" (2010). Electronic Theses and Dissertations. 8010.