RT Journal Article SR Electronic A1 Hlavna, Vladimir A1 Zvarkova, Daniela T1 A Mathematical Modelling of Nitrogen Oxide Formation in a cng Spark Ignition Engine JF Communications - Scientific Letters of the University of Zilina YR 1999 VO 1 IS 4 SP 37 OP 48 DO 10.26552/com.C.1999.4.37-48 UL https://komunikacie.uniza.sk/artkey/csl-199904-0005.php AB Nitrogen oxides occupy aspecific position among gaseous harmful emissions produced by combustion engines. This position may externally appear as a coherence between energetic and ecological properties of the engine. The paper deals with a 3-D modelling of nitrogen oxides formation in a CNG ignition engine when the FLUENT programme is applied.