Emission Sample Probe Investigation of a Mixed Flow JT8D-11Turbofan Engine.

摘要

An investigation of the emissions in the exhaust plume of a mixed flow JT8D-11 turbofan engines was conducted in order to optimize the shape, size, and location of fixed probes for acquiring representative emission samples. Traverse of 177 points over the exhaust nozzle were accomplished on a 2-inch-square grid. The average emission levels, contours, and profile distributions were determined. The predicted performance of area weighted cruciform and diamond probe designs were calculated from interpolations of the traverse contours. Exhaust emissions were measured with: (1) five mixing cruciform probes, (2) multihole averaging probes in the core, and (3) the engine turbine discharge pressure probes. Detailed traverses across engine power are considered necessary for representative emission measurement because of limitations existing in all fixed probing techniques investigated. (Author)