Study of Prediction Methods for NOx Emission from Turbofan Engines

Protecting the environment from the consequences of human activity has become a major challenge and goal in recent years, and therefore such considerations have become a critical component of engineering design and operation as well as of the formulation of policies and legislation. Emission from aircraft engines is a major environmental issue. To assess and control aircraft emission, one needs an accurate tool for predicting it reliably. Many methods of prediction are available for NOx emission index in the open literature, while some methods used by the industries require proprietary information. This paper brings together many important prediction methods (listed in the Appendix) and makes a systematic study of their accuracy and applicability. Finally, a new method called NOx: generic is proposed here, which compares well with the most dependable method (preferred by the industries), viz., the P(3) - T(3) method, but unlike the P(3) - T(3) method the present formulation does not require any proprietary information.