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In this paper, the flame-wall interaction of reacting diesel spray under engine like conditions is investigated using large eddy simulations. The aim of this study is to understand the influence of the distance between the wall and the spray nozzle on the air entrainment rate, which is a key variable in formation/oxidation process of soot. Three experimental cases are investigated, a free jet case
Fundamental characteristics of the reaction-zone structure for CH4-CO2 jets, mimicking a fuel of high CO2 contents such as biogas, burning in a heated coflow on a piloted jet burner have been investigated. Jet flames under diffusion and MILD combustion conditions were studied using planar laser-induced fluorescence (PLIF) of O-atom radicals and CO for different CO2 contents of the fuel jet. Numeri
DLE (Dry Low Emission) techniques are widely used today to reduce the harmful NOx emissions associated with high combustion temperatures. In many DLE systems the fuel and air are premixed which effectively keep the flame temperature as low as possible, ideally equal to the turbine inlet temperature. By using premixing stability issues such as flash back and combustion driven dynamics may occur. Op
This article outlines an experimental and numerical study on compatibility between flooring materials and concrete. Full-scale cylinders and slabs with different kinds of floorings were tested. The cylinders were studied in the laboratory, and cured in the same way as at a building site. The slabs were ground, treated with plaster and/or untreated (reference concrete). These slabs were water-cured
Be it in prose or be it in poetry, Charles Bukowski proposes anarchic protagonists, critical of the Establishment and absorbed in writing. Muses are plenty, but the real fuel for inspiration is alcohol, especially beer. Epic in poetry, abrupt in prose, Bukowski is unflinchingly honest and self-demythologizing. His hedonism and drunkenness are masks put on his revolt against the world and his own f
Strata compiles 37 conversations with artists whose work has made a significant contribution to the Italian and international art scene since 2000. This book is the personal account of a number of encounters, friendships, and professional relationships that Vincenzo de Bellis and Alessandro Rabottini have nurtured over the past twenty years. The conversations explore pivotal moments in each artist
The paper presents a large eddy simulation investigation on the effect of fuel injection pressure on mixing, in an optical heavy-duty diesel engine. Recent investigation on impinging wall jets at constant-volume and quiescent conditions exhibited augmented air entrainment in wall jets with increasing injection pressure, when compared with a free jet. The increased mixing rates were explained as ow
The traditional notuion of democracy being anchored in discussions among citizens is highlighted. The chapter makes the claim that while civic talk is central to the life of democracy, there are many socio-cultural factors that impede poitical discussion. Also, while formal deliberation is important, even the free-flowing, messy and unpredictable converations of everyday life can give rise to the
This chapter introduces the notion of civic culture as a frame for understanding political engagement and civic agency. In particular, the role of the media is underscored in shaping civic cultures; these include such dimensions as knowledge, values, practices and identities.
