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TWiki> CfdTm Web>Boundary conditions >TestCase053>TestCase053Res000 (2011-11-16, MohsinMohdSies)

TWiki> CfdTm Web>Boundary conditions >TestCase053>TestCase053Res000 (2011-11-16, MohsinMohdSies)

*Version:* 2.0-beta2

*Authors:* M. Hassanaly

Supposing that all of the fuel carbon is converted into carbon monoxide, which lacks any physical background, yields to the following expression:

In the following figures some results of computed and measured fluid properties (gas temperature) are shown. In order to limit the information given here, only the results obtained using the hexahedronic mesh are presented. In figure 2 and 3, respectively, axial and radial profiles of the gas temperature are plotted. The single radial profiles correspond to different y-distances. It can be seen that the temperatures obtained using the %$k-\omega$% model (CS 2.0 beta2 - k-omg) do not match the measured data very well, whereas using the %$k-\varepsilon$% model (CS 2.0 beta2 - k-eps) yields to reasonable results which are comparable to the experimental observations.

Figure 2: Temperature profiles obtained using both the %$k-\varepsilon$% model and the %$k-\omega$% model as well. Combustion occurs according to equation (1). Mesh consists of hexahedronic cells.

Figure 3: Temperature profiles obtained using both the %$k-\varepsilon$% model and the %$k-\omega$% model as well. Combustion occurs according to equation (1). Mesh consists of hexahedronic cells.

In Figure 4 and 5 temperature profiles are shown using again the %$k-\varepsilon$% model and the %$k-\omega$% model. However, this time combustion occurs according to reaction equation (2). Due to the formation of CO the predicted peak temperatures are reduced, being somewhat lower than the corresponding experimental value. Again, significant differences in the predicted and measured temperature profile can be observed using the k-ω turbulence model.

Figure 4: Temperature profiles obtained using both the %$k-\varepsilon$% model and the %$k-\omega$% model as well. Combustion occurs according to reaction equation (2). Mesh consists of hexahedronic cells.

Figure 5: Temperature profiles obtained using both the %$k-\varepsilon$%; model and the %$k-\omega$% model as well. Combustion occurs according to equation (2). Mesh consists of hexahedronic cells.

The results obtained assuming that combustion occurs according to equation (3) are shown in figure 6 and 7. Despite the fact that the exclusive formation of carbon monoxide during diffusive combustion lacks any physical background, these results are shown to prove that the peak temperature decreases with increased carbon monoxide formation. This can be clearly observed.

Figure 6: Temperature profiles obtained using both the %$k-\varepsilon$% model and the %$k-\omega$% model as well. Combustion occurs according to equation (3). Mesh consists of hexahedronic cells.

Figure 7: Temperature profiles obtained using both the %$k-\varepsilon$% model and the %$k-\omega$% model as well. Combustion occurs according to equation (3). Mesh consists of hexahedronic cells.

I | Attachment | Action | Size | Date | Who | Comment |
---|---|---|---|---|---|---|

png | HEXA_CO_komgkeps_prof1.png | manage | 15.8 K | 2010-09-13 - 11:48 | MarcusCharwath | |

png | HEXA_CO_komgkeps_prof2.png | manage | 16.5 K | 2010-09-13 - 11:48 | MarcusCharwath | |

png | HEXA_DEMICO_komgkeps_prof1.png | manage | 16.0 K | 2010-09-13 - 11:19 | MarcusCharwath | |

png | HEXA_DEMICO_komgkeps_prof2.png | manage | 16.8 K | 2010-09-13 - 11:19 | MarcusCharwath | |

png | HEXA_NOCO_komgkeps_prof1.png | manage | 15.7 K | 2010-09-13 - 10:37 | MarcusCharwath | |

png | HEXA_NOCO_komgkeps_prof2.png | manage | 16.5 K | 2010-09-13 - 10:39 | MarcusCharwath |

Topic revision: r24 - 2011-11-16 - 15:43:24 - MohsinMohdSies

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