Optical diagnostics of low-temperature ignition and combustion characteristics of diesel/kerosene blends under cold-start conditions

Zhicheng Shi, Chia fon Lee, Han Wu, Yang Wu, Lu Zhang, Fushui Liu

Research output: Contribution to journalArticle

Abstract

Diesel engine plays a vital role in various fields, but it does suffer from the cold-start issue when operating in low-temperature environment. As an alternative fuel or emergency back-up fuel for diesel engine, kerosene was investigated to reveal the influences of its difference on physical and chemical properties from diesel on low-temperature ignition characteristics. In this work, the spray and ignition characteristics of diesel/kerosene blends were investigated at ambient temperatures of 653–733 K and ambient densities of 10–22 kg/m3. Experiments were conducted in an optical constant volume combustion chamber using Mie-scattering and direct photography methods. The results show that under cold-start conditions, although kerosene has lower cetane number than diesel, its strong volatility significantly promotes the atomization and evaporation of the blends. The addition of 15% volumetric kerosene to diesel effectively shortens the ignition delay. In addition, the low-temperature ignition starts with a blue flame and further formaldehyde signal identification indicates that the blue flame is a cool flame. Kerosene addition enhances the cool flame intensity, which is conducive to the transformation to a high-temperature hot flame. Thus, adding a small proportion of kerosene to the diesel fuel contributes to a rapid cold-start at low temperatures.

Original languageEnglish (US)
Article number113307
JournalApplied Energy
Volume251
DOIs
StatePublished - Oct 1 2019

Keywords

  • Cold-start
  • Diesel/kerosene blends
  • Low-temperature ignition
  • Spray combustion

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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