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Prediction of Homogeneos Charge Compression Ignition (HCCI) Engines Performance Using Multi-Zone Model

Shahzadi, Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41898 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Mozafari, Ali Asghar
  7. Abstract:
  8. Some researches have been carried out in the last 20 years in order to increase the present IC engines thermal efficiency and their optimum performance. (HCCI) engine is viewed as a combination of spark-ignition (SI) and compression-ignition (CI) engines. This is because HCCI engines use premixed fuel/air mixture like SI engines and have auto ignition combustion after the mixture is compressed like CI engines. Control of combustion and ignition timing are the main challenges of these engines. Ignition delay, compression ratio, fuel air equivalence ratio and intake temperature and pressure are considered to be the most effective parameters on HCCI combustion.HCCI engines have great potentials regarding thermal efficiency and low NO and particulates emissions with high flexibility in using various fuels. These advantages make HCCI engines attractive alternatives for present normal SI and CI engines and subsequently most of the researches during last twenty years have been devoted toward them.The aim of this study is to analyze the HCCI engines, their fuel supply systems, suitable fuels and the effects of fuels on ignition delay. Finally a theoretical multi-zone model is presented to predict the performance of HCCI engine for CxHyOz fuels .heat transfer from in-cylinder contents to surrounding surfaces have been considered in this model
  9. Keywords:
  10. Ignition Delay ; Heat Transfer ; Autoignition ; Homogeneous Charge Compression Ignition (HCCI) ; Multi-Zone Method

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