Showing papers by "Hukam Mongia published in 1996"
10 Jun 1996
TL;DR: In this paper, the emissions data from a CFM56 single-annular combustor (SAC), the CFM 56 dual-ANNAC (DAC) and the CF6-80C SAC low-emissions configuration (LEC) were used to show the following: NOxEI can be correlated as a function of P3 and T3.
Abstract: The engine certification emissions data from a CFM56 single-annular combustor (SAC), the CFM56 dual-annular combustor (DAC), the CF6-80C SAC and the CF6-80C SAC low-emissions configuration (LEC) were used to show the following:(1) NOxEI can be correlated as a function of P3 and T3.(2) There is a unique relationship between NOx, CO and unburned hydrocarbons (HC).(3) NOx, CO and HC for engine operating points can be predicted reasonably well through “single reactor” modeling. However, the resulting NOx/CO/HC relationship is not as well predicted indicating need for further improving the semiempirical methodology.Copyright © 1996 by ASME
16 citations
10 Jun 1996
TL;DR: In this article, the authors proposed an anchored computational combustion dynamics (CCD) model for turbopropulsion engine combustion, which is anchored with one of the modern turboprocess engine combustors.
Abstract: Correlations based on design database, combined with multi-dimensional computational combustion dynamics (CCD) models are used in the combustion design process. However, because of limitations in the current turbulent combustion models, numerics, and boundary conditions, CCD has provided mainly qualitative trends for aerothermal performance, emissions and liner wall temperature levels and gradients. To overcome these deficiencies, hybrid modeling approaches have been proposed to analyze existing combustors. A typical hybrid modeling approach combines empirical and semianalytical correlations with CCD to give quantitatively accurate predictions of NOx, CO, HC, smoke, lean blowout, ignition, pattern factor and liner wall temperatures.An alternate approach, anchored CCD, is described in this paper. First, the models were anchored with one of the five modern turbopropulsion engine combustors. The anchored models were then run for the other four combustors. The predicted results correlated well with measured NOx, CO, HC, LBO and exit temperature quality data, demonstrating a broader applicability of the anchored method. The models were also used for designing a new combustion concept. The pre-test prediction agreed well with sector rig data from development hardware, showing the feasibility of using the anchored methodology as a design tool.Copyright © 1996 by ASME
7 citations