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 and Fushui Liu

Applied Energy, 2019, vol. 251, issue C, -

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.

Keywords: Cold-start; Diesel/kerosene blends; Spray combustion; Low-temperature ignition (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (23)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:251:y:2019:i:c:51

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DOI: 10.1016/j.apenergy.2019.113307

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