ANCHORED CCD FOR GAS-TURBINE COMBUSTOR DESIGN AND DATA CORRELATION

Correlations based on design database, combined with multidimensional computational combustion dynamics (CCD) models are used in the combust ion design process. However, because of limitations in the current tur bulent combustion models, numerics, and boundary conditions, CCD has p rovided mainly qualitative trends for aerothermal performance, emissio ns, and liner wall temperature levels and gradients. To overcome these deficiencies, hybrid modeling approaches have been proposed to analyz e existing combustors. A typical hybrid modeling approach combines emp irical and semianalytical correlations with CCD to give quantitatively accurate predictions of NOx, CO, HC, smoke, lean blowout, ignition, p attern factor, and liner wall temperatures. An alternate approach, anc hored CCD, is described in this paper. First, the models were anchored with one of the five modern turbopropulsion engine combustors. The an chored models were then run for the other four combustors. The predict ed results correlated well with measured NOx, CO, HC, LBO, and exit te mperature quality data, demonstrating a broader applicability of the a nchored method. The models were also used for designing a new combusti on concept. The pretest prediction agreed well with sector rig data fr om development hardware, showing the feasibility of using the anchored methodology as a design tool.