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RISApplication of a Phenomenological Model for the Engine Out Emissions of Unburned Hydrocarbons in Driving Cycles
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this work, the application of a phenomenological model to determine engineout hydrocarbon (HC) emissions in driving cycles is presented. The calculation is coupled to a physicalbased simulation environment consisting ...
A Hybrid, Runtime Coupled Incompressible CFD-CAA Method for Analysis of Thermoacoustic Instabilities
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Thermoacoustic instabilities in gas turbine engines are of increasing interest for design of future low-emission technology combustors. Numerical methods used to predict thermoacoustic instabilities often employ either ...
Large Eddy Simulation of Soot Formation in a Real Aero-Engine Combustor Using Tabulated Chemistry and a Quadrature-Based Method of Moments
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Considering the increasingly stringent targets for aircraft emissions, computational fluid dynamics (CFD) is becoming a viable tool for improving future aero-engine combustors. However, predicting pollutant formation remains ...
A Quasi dimensional Model of the Ignition Delay for Combustion Modeling in Spark Ignition Engines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Quasidimensional (QD) modeling of combustion in sparkignition (SI) engines allows to describe the most relevant processes of heat release. Here, a submodel for the ignition delay is introduced and applied. The start of ...
Numerical Investigation of Effusion Cooling Air Influence on the CO Emissions for a Single-Sector Aero-Engine Model Combustor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Stricter aviation emissions regulations have led to the desire for lean-premixed-vaporized (LPP) combustors over rich–quench–lean (RQL) burners. While this operation mode is beneficial for reducing NOx and particulate ...
Two-Phase Flow Simulations of Liquid/Gas Transport in Radial Centrifugal Pumps With Special Emphasis on the Transition From Bubbles to Adherent Gas Accumulations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In recent optical flow experiments on a transparent volute-type radial centrifugal pump, an accumulation of air bubbles to adherent gas pockets within the impeller blade channels was observed. A transition of unsteady ...
Large Eddy Simulations of Turbulent Gas-Liquid Flows in a Diverging Horizontal Channel Using a Hybrid Multiphase Approach
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Centrifugal pumps conveying gas–liquid flows are often designed based on pure liquid flows due to limited understanding of gas formations within a gas–liquid flow. Computational fluid dynamics (CFD) can provide insights ...