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Dissertation
A multifluid turbulent entrainment combustion model
Doctor of Philosophy (Ph.D.), Drexel University
1998
DOI:
https://doi.org/10.17918/00010324
Abstract
Combustion models used in spark-ignited (SI) engine simulation codes have traditionally been implemented into lumped parameter thermodynamic analysis models that neglect the effect of spatial gradients. Recently, multidimensional models for simulating combustion in SI engines have been developed, but they do not adequately characterize the interactions between the turbulent length and velocity scales and the combustion chemistry. In this thesis, a new approach to modeling turbulent combustion in multidimensional analyses is developed. An entrainment combustion model and advanced front tracking techniques are coupled with a multifluid model for the turbulent flow field. In this manner, a fully transient combustion model that includes the effect of turbulent scale and intensity, fuel type, and equivalence ratio on turbulent burning rate is developed. Following a discussion of turbulent combustion models currently in use for simulating premixed combustion, the governing equations and their implementation into the numerical scheme are described. Validation of the model is performed in two steps using one-dimensional simulations. First, a comparison between the computed results and an analytical solution for a simple geometry and flowfield is performed. The results from this phase of the testing show that the model agrees well with the analytically determined values and captures the jump in density and velocity through the reaction zone. Next, a comparison of the model predictions for a turbulent combustion bomb with experimental data is used to evaluate the ability to model a geometry more closely resembling that of an SI engine combustion chamber. This step in the testing demonstrates that the model predictions are in excellent agreement with the experimental findings. Based on the results from these comparisons it is concluded that the new model is capable of predicting turbulent burning rates and the formulation developed as part of this research provides a good representation of the actual physics of the turbulent combustion problem.
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Details
- Title
- A multifluid turbulent entrainment combustion model
- Creators
- Kevin Verne Tallio
- Contributors
- Nicholas Peter Cernansky (Advisor) - Drexel University, Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xii, 153 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021889077904721