Løvås, T and Cant, RS and Lowe, A and Mastorakos, E (2006) Three-dimensional direct numerical simulations of autoignition in turbulent non-premixed flows with simple and complex chemistry. In: UNSPECIFIED pp. 1389-1396..Full text not available from this repository.
3D Direct Numerical Simulations (DNS) of autoignition in turbulent non-premixed flows between fuel and hotter air have been carried out using both 1-step and complex chemistry consisting of a 22 species n-heptane mechanism to investigate spontaneous ignition timing and location. The simple chemistry results showed that the previous findings from 2D DNS that ignition occurred at the most reactive mixture fraction (ξMR) and at small values of the conditional scalar dissipation rate (N|ξMR) are valid also for 3D turbulent mixing fields. Performing the same simulation many times with different realizations of the initial velocity field resulted in a very narrow statistical distribution of ignition delay time, consistent with a previous conjecture that the first appearance of ignition is correlated with the low-N content of the conditional probability density function of N. The simulations with complex chemistry for conditions outside the Negative Temperature Coefficient (NTC) regime show behaviour similar to the single-step chemistry simulations. However, in the NTC regime, the most reactive mixture fraction is very rich and ignition seems to occur at high values of scalar dissipation. Copyright © 2006 by ASME.
|Item Type:||Conference or Workshop Item (UNSPECIFIED)|
|Divisions:||Div A > Energy|
|Depositing User:||Cron Job|
|Date Deposited:||02 Sep 2016 17:01|
|Last Modified:||01 Dec 2016 08:35|