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Advisor(s)
Abstract(s)
The aeronautical sector is dependent on fossil fuels which contribute to a considerable amount of pollutant emissions to the atmosphere. In an attempt to reduce these pollutant emissions in a short period of time and without several changes to the aircraft and their engines, this study focuses on the physical phenomena that happen inside the combustion chamber of an internal combustion engine during fuel injection. However, instead of considering only a conventional jet fuel, an alternative fuel is also investigated. The mixture is composed of at least 50% in volume of conventional jet fuel, as demanded by the current legislation, and a biofuel to decrease the consumption of petroleum-based fuels and to reduce pollutant emissions.
The main goal of this study is to experimentally observe droplet impact on a heated dry stainless-steel surface for different fuel mixtures, impact energies (Weber number between 174 and 955, and Reynolds number between 1099 and 12365), and wall temperatures (Tw = 20 − 300 ºC) to identify the different heat regimes and the physical differences between the distinct sets of impact conditions. To achieve that purpose an experimental setup was designed and built including the acquisition of high-speed images, a droplet dispensing system, a heating device to accurately control the temperature of the target surface and the illumination of the impact site. To enhance the knowledge about the impacts, three different perspectives of the phenomena were captured. The typical front perspective, a second perspective where the camera has a ≈ 20◦ angle to the impact surface to capture more details of the impact, and finally, at a lower frame rate, an isometric perspective to measure the evaporation time. From these data, the impact regimes were identified and the influence of surface temperature, fluid properties, and impact energy was analyzed.
Description
Keywords
Droplet impact Heated Surface Jet Fuel Alternative Fuels
Citation
Daniela Ribeiro, Jorge Barata, André Silva, "Experimental Study of a Single Droplet Impinging Upon a Heated Dry Surface Using Jet Fuel and Biofuel Mixtures", ILASS–Europe 2022, 31st Conference on Liquid Atomization and Spray Systems, Virtual, Israel, 6-8 September, 2022
Publisher
ILASS - Europe, Institute for Liquid Atomization and Spray Systems