||Nitric-Oxide Measurement in a Spark-Ignition Engine.
McAlevy, II, Robert F. ;
Col, Richard B. ;
||Stevens Inst. of Tech., Hoboken, N. J. Dept. of Mechanical Engineering.
||ME-TR-73001; EPA-R-801874; 1498;
( Spark ignition engines ;
( Nitrogen oxides ;
Spark ignition engines) ;
Ultraviolet spectroscopy ;
Exhaust gases ;
Computer programming ;
Air pollution ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
To facilitate controlled, reproducible testing for nitric-oxide (NO) generation, a mechanical analog for the spark-ignition was designed, instrumented and tested. The analog provides for constant-volume combustion followed by product-gas expansion through a cam-driven poppet valve, giving pressure-time histories like those of spark-ignition engines. Measurements of NO concentrations in the product gas were made several seconds after combustion both with and without product-gas expansion. Ultraviolet absorption was used to monitor these NO concentrations. Efforts to measure NO concentrations during constant-volume combustion were impeded. by unanticipated strong background absorption by CO2. (Modified author abstract)