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Thermal Oxidation of Ethanol : Experimental and Numerical Analysis of Ignition Chemistry of Ethanol-Air Mixtures in Shock-Heated Gases
| Content Provider | Semantic Scholar |
|---|---|
| Author | Cancino, Leonel Rincón Oliveira, Amir Antonio Martins |
| Copyright Year | 2009 |
| Abstract | The present work proposes a detailed kinetic model for the thermal oxidation of ethanol/air mixtures at intermediate temperatures and high pressures, validated against ignition delay times measured in a shock tube behind reflected shock waves. Ignition delay times were measured under stoichiometric conditions at 10, 30, and 50 bar and from 650 to 1220 K. From a multiple linear regression analysis using ln(τ) as the dependent variable and (1/T ) and ln(p) as independent variables an expression of τ/μs = 10−1.79 exp(+12400 K/T ) (p/bar)−0.83 was curve fitted for the measured range of temperature, pressure and stoichiometric mixture. The kinetic model was built up by incorporating available submechanisms for ethanol chemistry (Marinov) as well as C3-chemistry (Konnov), taken as central kernel. Additionally, other key reactions obtained from computational chemistry and available on the literature (Lin) were included. For improvement of the model, the sensitivity of each reaction on temperature, OH, H2O2, and C2H5OH concentrations was determined using a perfectly-stirredreactor assumption for temperatures of 1100, 950, and 800 K at all pressures and stoichiometric mixture. The sensitivity analysis identified a set of important reactions involving the H-atom abstraction from the ethanol molecule by the hydroperoxy radical (HO2), giving CH3CHOH, acetaldehyde and H2O2. The model predicts the global trend with temperature and pressure as well as the lower sensitivity of the ignition delay time with pressure at higher pressures. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repositorio.ufsc.br/bitstream/handle/123456789/193043/ISSW27_Thermal_Oxidation_of_Ethanol_Leonel.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
