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Using Experimental Results and a Multi-Zone HCCI Combustion Model to Develop a Surrogate Diesel Fuel Autoignition Mechanism

Akbari Ziarani, Samira | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47197 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hosseini, Vahid
  7. Abstract:
  8. Real fuels contain hundreds of hydrocarbons such as linear and chain paraffins, naphthenes, olefins and aromatics.Behavior of this real fuels are represented by mixtures with simple compounds. Since engine with homogeneous charge compression ignition (HCCI) is a promising combustion concept able to provide very low NOx and PM diesel engine emissions while keeping good fuel economy, for use in vehicles requires kinetic reaction mechanism to simulate the hydrocarbons oxidation and it’s rules.combustion control is facing with basic problem in this engine.unlike conventional methods, . HCCI combustion is a kinetically controlled process and start of combustion will be controlled and dominanted by reactions.The object of this project is chemical kinetic mechanism development for diesel fuel using experimental result that represent diesel combustionbehavior. For this purpose a mixture of n-heptane, toluene and n-decane respectivelywith 55%, 25% and 20% was suggested and mechanism of diesel fuel surrogate includes 132 species and 999 reactions. At first this mechanism was validated in single-zone model with experimental result for ϕ=0.28in four compression ratio(10, 11, 12, 13.5).In single-zone model, the effect of various parameters such as temperature,initial pressure, compression ratio, and the effect of H2 and EGR was studied. Also whit analysis the main combustionreaction of heptan, toluene and decane, reaction pathway for low and main combustion of surrogate fuel mechanism was determined. After studing on number of zones, multi-zone accurately predicted the behavior of pressure and the start of combustion and even achieved combustion duration close to reality.with testing more working point, weakness of the surrogate mechanism was classified in a number of specific conditions.The result show that mechanism of diesel fuel surrogate have the ability to predict the low and high temperature combustion in most rang of experiment results and by adding other components in diesel range molecules, this mechanism can be used for other studing such as soot predicting
  9. Keywords:
  10. Homogeneous Charge Compression Ignition (HCCI) ; Kinetics Study ; Diesel Fuel ; Chemical Kinetic ; Surrogate Diesel Fuel ; Surrogate Component Fuel

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