Fully Compressible Numerical Simulations of Primary Breakup Processes in Dual Fuel Internal Combustion Engines

We investigate two different n-dodecane mass flow rates for the “Spray A-210675 model” with an initial pressure of 6MPa and a mixture of 80% Nitrogen and 20% Methane in the chamber. The computational domain is 10D*10D*20D. The computational grid with a smallest mesh size of 0.04μm is applied and the obtained results are analyzed in detail. At high mass flow rate, in- nozzle instabilities and Kelvin-Helmholtz instabilities dominate the primary breakup independent of the surface tension. The disturbance generated by the head of the mushroom jet transmits through the gas mixture to the upstream liquid area and causes the instability to grow in the direction of the liquid core. In case of a low mass flow rate, Rayleigh instabilities become relevant. The results improve our knowledge on how these instabilities develop and contribute into DFICE atomization, providing data on effective designs of DFICE components including Fuel Injection Equipment (FIE) and providing reference data for DFICE primary breakup processes, as detailed experimental measurements and visualizations are insufficiently available.     «

We investigate two different n-dodecane mass flow rates for the “Spray A-210675 model” with an initial pressure of 6MPa and a mixture of 80% Nitrogen and 20% Methane in the chamber. The computational domain is 10D*10D*20D. The computational grid with a smallest mesh size of 0.04μm is applied and the obtained results are analyzed in detail. At high mass flow rate, in- nozzle instabilities and Kelvin-Helmholtz instabilities dominate the primary breakup independent of the surface tension. The distu...     »