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The experimental studies results of diesel fuel ignition regularities by hot single metal particles and fuel droplets on a heated metal plate surface are presented. The ignition delay time dependences on the initial heat source temperature were determined. The results are a basis for the development of typical liquid fuels ignition models in terms of heat and mass transfer processes in a small neighborhood. Liquid fuels are widely used in road transport and under certain conditions (storage, transport, congestion) are sources of increased danger. They can cause a fire during thermal exposure of high intensity. Heat sources can be different, as well as the conditions of exposure (1-3). To date, mathematical models and solving methods for the ignition of solid (4, 5) and liquid (2, 3) fuels are worked out. Experimental conditions and the ignition characteristics of solid monolithic (9) and dispersed (7) fuels with a local heating source are established. Ignition regularities for films and drops of distillate fuels are studied much worse. The purpose of this work is an experimental study of diesel fuel ignition conditions and characteristics. Two of the most important options for practice are considered: a single fuel film heated up to high temperatures and particle droplets on the heated metal plate surface. Film fuel ignition process research was conducted on the plant (9), the concept of which is shown in Fig. 1, and drop method (1) (the experimental scheme is shown in Fig. 2). In all experiments a video registration of the investigated processes was conducted. The time moments of heat source (particle or plate) contact with a liquid (film or drop, respectively) and the ignition delay time were registered. As the heat sources the steel particles (diameter of dp = 6 · 10 −3 m and a height of hp = 3 · 10 −3 ÷7 · 10 −3 m) and the steel plate (size 5 · 10 −2 × 5 · 10 −2 m and a height hw = 5 · 10 −3 m) were used. Particles fall from a small height (0.01m) onto the fuel film surface. A possible change in its temperature is due to heat sink in the air. It is established that during the fall of the particles temperature is reduced by not more than 5K, which is about ±0.5% depending on the absolute value of the initial particle temperature. Experiments at constant heat source temperature T0 is repeated at least 7 times under identical conditions. Random error in ign determining is no more than ±10% in the experiments with the particle heat source and up to ±16% in the experiments with hot plate. The dependences of the diesel fuel ignition delay times from the initial heat source temperature obtained from the experiments results are shown in Fig. 3. Measurements have shown that the temperature of the massive plate during the experiment remained virtually unchanged (droplet sizes This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Experimental research of heat transfer conditions influence on the distillate fuels ignition characteristics