Computational Fluid Dynamics (CFD) has become an integral part of product design and development. Today, CFD is extensively used across industries like Aerospace, Automotive, Marine, Oil and Gas, Electronics, Health care, Process and Infrastructure. While CFD tools provide detailed engineering insights and shorter product development cycles at reduced cost, CFD community is constantly working hard to improve accuracy, speed and ease of use of these tools. Complex physical phenomenon such as detailed chemistry, primary atomization, electro-chemistry, icing formation are constantly investigated and newer, better and accurate numerical models are introduced in CFD tool.
Spray-wall interaction is one of such complex physical phenomena. Impinging spray droplet can stick, splash, spread, rebound or can undergo thermal breakup. Droplet mass deposited on the wall can form liquid film and travel along the surface. The droplet impingement physics is fairly complex and depends on several droplet, surface and impingement properties.
Prediction of accurate spray wall interaction is of critical importance in many industrial applications. In gas turbines, the fuel droplets impinging on the wall may lead to coke formation and alter emission characteristics. In traditional port fuel injection (PFI) engines, fuel is injected in the intake port which is followed by significant fuel-film formation on the walls of port and intake valve. Fuel-film plays an important role in determining the air/fuel mixture distribution, dynamic engine performance and emissions. In gasoline direct injection (GDI) engines, the fuel is directly injected in the combustion chamber. Fuel spray impinge on combustion chamber walls and about half of the injected fuel may deposit forming fuel film. This unburned fuel film is the main source of soot emission.
Spray wall interaction and wall film formation is also of great interest for automotive exhaust aftertreatment community. Selective Catalytic Reduction (SCR) devices used in modern diesel exhaust after-treatment system are tuned for optimum spray-wall interaction. Deviation from optimum configuration may lead to large urea deposit formation and warranty issues. Spray–wall interaction is of critical importance in application involving spray cooling such as material processing industry, electronics industry and spray coating used in pharmaceutical and agricultural sprays.
ANSYS Fluent 16.0 has improved and validated spray-wall interaction models. and features new and comprehensive impingement model supported by new, accurate spray-wall heat transfer model. This improvement can be leveraged for better prediction and product development. If you would like to hear more about this topic, please join us for one of the upcoming webinars.
Spray-Wall interaction: model improvements and validations in ANSYS Fluent 16.0
Wednesday, May 27 at 5 AM EDT (9 AM GMT)
Wednesday, May 27 at 4 PM EDT (8 PM GMT)
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