CH₄-공기 동축제트화염의 NOx 배출특성에 관한 수치 및 실험적 연구

김종현; 오창보; 이창언

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The NOx emission eharacteristics of C1I4-Air collow jet !lames were numerieally and experimentally investigated. NOx was measured using a chemiluminescent detection and calculated by the parabolic-type equation solver with a detatilcd NOx chemistry. The fuel !low rate( Qp), the diameter of mixture nozzle and the equivalence rate　Φ were varied to diseuss the EINOx of eaeh !lames at the various combustion conditions. The NOx emission index( EINOx) was introduced to quantify the NOx emission from the parametrically varied !lames. The results show that Prompt EINOx incrcases on a logarithmic profile with increasing Φ and keeps nearly constant for the variation of Qr. Thermal EINOx reaehes the maximum value at around Φ = 1.5 and then slowly decrease for Φ 1.5. In addition, Thermal EINOx increases with increasing Qr. but nearly indifferent to the variation of the mixture nozzle diameter. Total EINOx also shows a peak at around Φ = 1.5. followed by a relatively sharp decrease for 1.5Φ <2.5 and increase slowly for 2.5Φ 00 . The present Total EINOx trend is well explained by a combination of above Thermal and Prompt EINOx trend with the variation of Φ.