Measurement of NO and NOy emission indices during SUCCESS

T. L. Campos, A. J. Weinheimer, J. Zheng, D. D. Montzka, J. G. Walega, F. E. Grahek, S. A. Vay, J. E. Collins, L. O. Wade, G. W. Sachse, B. E. Anderson, W. H. Brune, D. Tan, I. Faloona, S. L. Baughcum, B. A. Ridley

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Exhaust measurements in the wake vortex regime of the NASA Boeing 757 aircraft were made during the SUbsonic aircraft: Contrails and Cloud Effects Special Study. Emission indices for NO and NOy were calculated from in situ measurements taken on board the NASA DC-8 for plumes aged 20-300 seconds. The average NO emission index is 7.5 g NO2/kg fuel for mean conditions of 37 kft altitude, 0.7 Mach and 0.34 kg/s fuel flow rate. Comparison is made between measured indices and predictions based on ground engine test data and a fuel flow model. Measurements are positively correlated but are on average 22% higher than predictions, with considerable scatter and systematic deviations in measurements made under low thrust conditions. These conditions are lower than typical in commercial cruise operation of the 757, for which the model was optimized. No statistically significant change in nitrogenous emissions is observed for an order of magnitude change in fuel sulfur content. Estimation of the NO2 from photochemical calculations implies a contribution to NOx of 5-19%. Examination of exhaust composition shows that 95% of the NOy is in the form of NOx.

Original languageEnglish (US)
Pages (from-to)1713-1716
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number10
DOIs
StatePublished - May 15 1998

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Measurement of NO and NO<sub>y</sub> emission indices during SUCCESS'. Together they form a unique fingerprint.

  • Cite this

    Campos, T. L., Weinheimer, A. J., Zheng, J., Montzka, D. D., Walega, J. G., Grahek, F. E., Vay, S. A., Collins, J. E., Wade, L. O., Sachse, G. W., Anderson, B. E., Brune, W. H., Tan, D., Faloona, I., Baughcum, S. L., & Ridley, B. A. (1998). Measurement of NO and NOy emission indices during SUCCESS. Geophysical Research Letters, 25(10), 1713-1716. https://doi.org/10.1029/97GL03480