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The paper describes coupled CFD combustion simulations and CAE engine performance computations to describe the operation over the full range of load and speed of an always lean burn, Direct Injection Jet Ignition (DI–JI) hydrogen engine. Jet ignition pre-chambers and direct injection are enablers of high efficiencies and load control by quantity of fuel injected. Towards the end of the compression stroke, a small quantity of hydrogen is injected within the spark-less pre-chamber of the DI–JI engine, where it mixes with the air entering from the main chamber and auto-ignites because of the...
Computational Fluid Dynamics codes have been used in motorsports for decades, but have only recently become available to private and Formula Student teams. The use of “out of the box” codes by non-specialist personnel in the development of aerodynamic packages can produce poor results and lead to low quality designs. By comparing numerical results obtained using different basic settings with experimental tests of the same set-up, this project aims to determine whether commercial CFD packages can be used as a tool for race car aerodynamic design in a low-budget environment by relatively...
This paper supports a concerted effort towards validating an unstructured finite volume methodology for combined flow, thermal and stress analysis of turbine blades. In this part, CFD and conjugate heat transfer solutions are compared against measured surface pressure and heat transfer profiles on the C3X turbine. Sensitivities of the prediction to inlet turbulence levels and laminar-to-turbulent boundary layer transition are also presented. The general framework of the paper describes an integrated system incorporating three important analysis components with respect to CAE analysis of...
Ensuring the thermal comfort of passengers is a crucial concern for passenger vehicle cabins. Passenger comfort is influenced by factors including the performance of the HVAC system, exposure to solar and thermal radiation, the thermal conductivity of the materials used in the cabin and the humidity of the surrounding air. A reliable approximation of thermal comfort parameters requires accurate numerical representation of all of these physical phenomena. This can be achieved by utilising strongly coupled solution of radiation, conduction and thermal fluid dynamics. In the present study,...
Thermal fatigue is a degradation mechanism induced on the primary piping system of a nuclear power plant. Consequences of thermal fatigue are often critical, ranging from structural damage to a complete shut-down as happened with the French pressurized water reactor (PWR) Civaux in 1998. Thermal fatigue has been a very persistent problem and has also occurred in the Japanese PWR Tsuruga-2 in 1999, and the Japanese PWR Tomari-2 in 2003. Hence, it is considered to be a serious safety concern and is seen as one of the most influential parameters on the ageing and life management of nuclear power...
To allow the detailed analysis of the two-phase coolant flow and heat transfer phenomena in a Boiling Water Reactor fuel bundle the CFD-BWR model is being developed for use with the commercial code STAR-CD which provides general two-phase flow modeling capabilities. The paper reviews the key boiling phenomenological models, describes the overall strategy adopted for the combined CFD-BWR and STAR-CD boiling models validation and presents results of a set of experiment analyses focused on the validation of specific models implemented in the code. The location of vapor generation onset, axial...

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