UV Absorption Measurements of Nitric Oxide Compared to Probe Sampling Data forMeasurements in a Turbine Engine Exhaust at Simulated Altitude Conditions

摘要

Nitric oxide measurements were conducted in the exhaust of a turbofan engine atsimulated altitude conditions in a ground-level test cell using both optical nonintrusive and conventional gas sampling techniques. NO-UV absorption measurements, using both resonance and continuum lamps, were made through several chords of the exhaust flow near the nozzle exit plane as a part of a larger effort to characterize aircraft exhaust constituents over a wide range of steady-state engine operating conditions. This paper describes the NO-UV absorption measurements and compares radial profiles of NO concentrations and emission indices with measurements obtained using conventional gas sampling and tunable diode laser infrared absorption.