Shock tube experimental studies on the ignition delay of n-heptane/ethanol fuel blends with acetaldehyde (CH3CHO) and oxynitride (NO/NO2) additives. (April 2023)

• Record Type: Journal Article
• Authors: Yang, Can; Li, Yuhang; Wang, Weiye; Cheng, Xiaobei
• Is Part Of: International journal of engine research. Volume 24:Number 4(2023)
• Page Start: 1388
• Page End: 1399
• Publication Date: 2023-04
• Subjects: Shock tube -- CH3CHO -- NO/NO2 -- ignition delay time -- n-heptane/ethanol fuel blends; Engines -- Periodicals; 629.25
• DOI: 10.1177/14680874221085635
• Languages: English
• ISSNs: 1468-0874

Abstract

In recent studies around low-temperature combustion (LTC) engines, it has been found that the incomplete oxidation products (IOP) within exhaust gas recirculation (EGR) presents non-negligible chemical effects. However, IOP generally has complex ingredients, and little literature available conducts quantitative and comparative studies on the effects of these ingredients. In this paper, CH3 CHO, which is considerably abundant, and NO, which is most active, are selected as typical ingredients of IOP, and their effects on ignition delay times of n-heptane/ethanol fuel blends are studied experimentally in a shock tube covering the equivalence ratios of 0.5, 1, 1.5, temperature range of 900–1200 K, and pressure of 10 atm. Experimental results show that both CH3 CHO and NO/NO2 (part of NO is inevitably converted to NO2 ) promote ignition, and the promoting effect of NO/NO2 is stronger than CH3 CHO . It is consistent for both CH3 CHO and NO/NO2 that the higher the concentration or, the lower the equivalence ratio, the greater the promoting effect. The difference is that the promoting effect of CH3 CHO weakens with temperature increasing, while the promoting effect of NO/NO2 strengthens. Besides, the promoting effect of NO2 is weaker than that of NO, and NO2 even begins to inhibit ignition at temperatures below 960 K. In addition, it follows chemical kinetic analysis that both CH3 CHO and NO/NO2 accelerate the decomposition of fuel by producing more OH radicals during the ignition stage. Although the additives are in trace amounts, the OH produced by their early involvement in reactions can effectively accelerate the ignition, which indicates the non-negligible chemical effects of IOP in EGR.