Analysis of Emissions from Pulse-jet Engines

The conventional internal-combustion engines can generate pollutions due to emissions of CO, HC, NOx, etc. into air if ratio of the fuel/air mixture entering into the combustion chamber is high. The exhaust gas ingredient of new pulse engines was tested with five combustion-chamber capacities and three fuel restrictor opening sizes at different points of the exhaust tube. The excess air coefficient of mixer of fuel and air feeding into the combustion chamber were obtained by measuring the fuel consumption rate and air mass flow rate. In order to determine the chemical composition and content of exhaust gas, the CO, HC contents and the coefficient were also measured with an NHA-501 exhaust gas analyzer at 4 different points (0cm, 15cm, 30cm and 60cm) from the end of exhaust tube. Test results illustrated the amount of pollutants in the fume of exhaust gas was very low even if the excess air level was less than 1 or even much less than 1, i.e. a=0.6. For all circumstances, the content of HC was zero and the content of CO was about 0.02%. Therefore, the application of pulsation combustors would not result in harmful pollutants to the environment.