NAVAL SHIP ENGINE EXHAUST EMISSION CHARACTERIZATION

Legislative and regulatory action is pending at the international, national and state level that will potentially require U.S. Navy compliance with ship engine exhaust emission standards. These standards are based on commercial ship applications and are not suitable models for the time history of naval ship main propulsion engine speed and power combinations. Naval ships are designed and operated much differently than commercial ships and must be considered independently in engine emission regulation. A strategy for testing naval diesel engines for exhaust emissions is presented in this paper. A simple procedure to develop naval ship engine duty (test) cycles by combining ship hull form characteristics, propulsion plant parameters, and ship operating profile is presented. Duty cycles model the time history of engine speed and power. Results for the U.S. Navy LSD 41 Class and MCM 1 Class are presented. Comparisons of the derived LSD 41 Class Duty Cycle with commercial standards show that commercial duty cycles are inappropriate for use in naval applications.