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Simultaneous Reduction of NOx and Smoke by Divided Diffusion Combustion Using High Dispersion Staggered Layout Nozzle

Article of Honda R&D Technical Review Vol.33 No.2

Summary

In order to realize extremely low emissions with diffusive diesel combustion, a study was made of methods for smoke suppression under the high-boost, high-EGR conditions that are effective in reducing NOx. Divided combustion that combines a reduction in the injected amount of main fuel with premixed combustion in which the amount of fuel injected early is increased was adopted in order to reduce the rich portion of the main diffusion combustion, which was the main generator of smoke in conventional combustion. The adoption of this divided combustion made it possible to raise the fuel injection pressure, which had previously been limited due to combustion noise, and a smoke reduction effect was confirmed together with the effect of divided combustion. In addition, a staggered spray layout was adopted in order to reduce dilution of the premixed injection. Combining these methods achieved diffusive diesel combustion with extremely low emissions, and reduced NOx by 40% while not causing increases in combustion noise or smoke, or reduction of thermal efficiency relative to conventional combustion.

Reference

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Author (organization or company)

Hirokazu ANDO(Innovative Research Excellence Power Unit & Energy)、Satoshi AOYAGI(Innovative Research Excellence Power Unit & Energy)、Masayuki NAKATSU(Innovative Research Excellence Power Unit & Energy)、Naoki OHYA(Innovative Research Excellence Power Unit & Energy)

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