NOx emission from a two-stroke ship engine: Part 2 – Laboratory test

International regulations force ship owners to monitor the NOx emission from engines during sea operational use of ships, but standard equipped engine rooms has not installed any measurement equipment to analyze of exhaust gases. According to these regulations, we proposed a simple method to estimation of NOx emission without direct measurement, based on the measurements of working engine parameters. In this paper, we present the effect of laboratory test to verification adequacy of the developed model. In this aim, we carried out tests on the two-stroke, one-cylinder, and loop scavenged diesel engine. During tests the engine operated with the various rotational speed, load, and changing air/fuel equivalence ratio. The comparison of the results of calculations with conducted tests showed the estimation errors in intervals 1.8% to 11% in dependence from the substitute molar compositions of fuels.