Transfer Function Model, A Computer Program for Determination of Jet Engine Test Cell Exhaust Particulates and Opacity

摘要

The Transfer Function Model (TFM) is an extensive computer program which is capable of computing the downstream parameters of a jet engine exhaust plume for generalized initial conditions, duct system geometry, and liquid and/or gas dilution. For example, the TFM can be used to predict the opacity of a plume at any distance from the engine exhaust plane, or the change in opacity as the engine load is changed. More specifically, the following parameters of the exhaust plume can be calculated by the TFM at any arbitrary point downstream from the jet exhaust plane: (1) Particulate size distribution, (2) Gas temperature, (3) Gas density (and water vapor density), (4) Gas velocity, (5) Droplet size distribution (if condensation has occurred or if water has been injected), (6) Light scattered and absorbed by each of the various sized particulates, and (7) Total plume opacity. (Author)