Filtyp
Temperature stratification plays an important role in HCCI combustion. The onsets of auto-ignition and combustion duration are sensitive to the temperature field in the engine cylinder. Numerical simulations of HCCI engine combustion are affected by the use of wall boundary conditions, especially the temperature condition at the cylinder and piston walls. This paper reports on numerical studies an
Large eddy simulations are performed for a single- and multiphase jets in crossflow (JICF). The multiphase JICF are compared to the single-phase case for the same momentum and mass flow ratios but with droplets of different sizes. Multiphase JICF have stronger counter-rotating vortex pairs (CVPs) than a corresponding single-phase JICF. Moreover, their trajectories are higher and their induced wake
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
Klimatförändringarna påverkar vår värld och det behövs ett mer hållbart samhälle. Flygindustrin är i behov av förändring, men flygmotorer är mycket komplexa och tar tid att utveckla. Termoakustiska instabiliteter har kraften att förstöra en motor, men också att minska miljöpåverkan. Samtidigt möjliggör ökad beräkningskraft i moderna datorkluster att detaljerade simuleringar kan utföras för att stuClimate change is affecting our world and a more sustainable society is needed. The aviation industry is in need of change but aero-engines are very complex and take time to develop. Thermoacoustic instabilities have the power to destroy an engine, but also to reduce the environmental impact. At the same time, increasing computational power allows detailed simulations to be executed in order to st
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
CURRENT DYNAMICS IN SOUTHEAST ASIA NEW PERSPECTIVES IN POLITICAL ECONOMY AND COMPARATIVE POLITICS SEMINAIRE EUROPÉEN / BIMESTRIEL Vendredi / 14h-18h Lieux : Inalco, Maison de la recherche, 2 rue de Lille, Paris 7e ; ou CERI, Paris 7e. COORDINATION Elsa Lafaye de Micheaux, CASE, Inalco; Astrid Norén-Nilsson, ACE, Lund; David Camroux, CERI, Sciences Po; Delphine Allès, CASE, Inalco. COMITÉ SCIENTIFI
https://www.ace.lu.se/sites/ace.lu.se/files/2024-08/Current%20Dynamics%20Programme%202024-2025%20V3.pdf - 2026-06-03
CURRENT DYNAMICS IN SOUTHEAST ASIA NEW PERSPECTIVES IN POLITICAL ECONOMY AND COMPARATIVE POLITICS SEMINAIRE EUROPÉEN / BIMESTRIEL Vendredi / 14h-18h Lieux Inalco, Maison de la recherche, 2 rue de Lille, Paris 7e ; ACE, Sölvegatan 18, Lund ou CERI, 28 rue des Saints Pères, Paris 7e. COORDINATION Elsa Lafaye de Micheaux, CASE, Inalco ; Astrid Norén-Nilsson, ACE, Lund; David Camroux, CERI, Sciences P
https://www.ace.lu.se/sites/ace.lu.se/files/2024-10/Current%20Dynamics%20in%20Southeast%20Asia_2024-2025.pdf - 2026-06-03
The savanna ecosystem is one of the most dominant and complex terrestrial biomes, deriving from a distinct vegetative surface comprised of co-dominant tree and grass populations. While these two vegetation types co-exist functionally, demographically they are not static but are dynamically changing in response to environmental forces such as annual fire events and rainfall variability. Modelling s
Popular Abstract in Swedish Energibalansen vid jordytan är av avgörande betydelse för Jordens alla ekosystem men när det gäller Arktiska och sub-Arktiska ekosystem är kunskapen bristfällig. I dynamiska system som klimatsystemet, påverkas utbytet av energi, vatten och växthusgaser av små förändringar i ekosystemen. Syftet med denna avhandling är därför att skapa ökad kunskap och en tydligare bild aThe surface energy balance determines the functioning of any ecosystem on the Earth but is still poorly understood in Arctic and subarctic biomes. In a dynamic system, such as the Earth’s climate, any change in its characteristics modifies the exchange of energy, water, and greenhouse gases between the surface and the atmosphere. Therefore, this thesis aims to draw a conclusive picture of the surf
We previously reported that soluble decay-accelerating factor (DAF) and coxsackievirus-adenovirus receptor (CAR) blocked coxsackievirus 133 (CVB3) myocarditis in mice, but only soluble CAR blocked CVB3-mediated pancreatitis. Here, we report that the in vitro mechanisms of viral inhibition by these soluble receptors also differ. Soluble DAF inhibited virus infection through the formation of reversi
Large eddy simulations of pilot fuel ignited, lean premixed, natural gas engines are performed to study the pilot-ignition process and its subsequent interaction with the premixed charge. The injection pressure (Pinj) and injection duration (Δinj) are varied (i.e. 800 bar/760μs, 800 bar/500μs, and 400bar/760μs) to study the impact of the injection process on the subsequent combustion evolution. Op
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
