Simulating Hydrogen Combustion in the Sandia DI Engine скачать в хорошем качестве

Simulating Hydrogen Combustion in the Sandia DI Engine

Hydrogen-powered internal combustion engines offer significant advantages over conventional fossil fuel engines, including reduced carbon emissions and high energy efficiency. Simulating hydrogen engines can help us enhance the engine performance, understand fuel injection and ignition strategies, as well as assess emissions and combustion characteristics. This video shows a simulation of high-velocity hydrogen injection and combustion in the Sandia hydrogen direct-injection engine. We captured the complex combustion dynamics of hydrogen with CONVERGE’s SAGE detailed chemistry solver. In addition, we employed CONVERGE’s Adaptive Mesh Refinement (AMR) to help efficiently capture the high-speed hydrogen injection, shock waves, and fuel-air mixing. In the first view (0:07-0:26), the intake valve opens to allow the inflow of air. A few moments later, the valve closes and hydrogen, which is colored red to indicate areas of high mass fraction and blue to show areas of low mass fraction, is injected into the chamber. The video then shows the ignition of the hydrogen-air mixture at the spark plug, where the flame is depicted with red colors indicating regions of high temperature and green colors showing areas of low temperature. The second view (0:27-0:50) displays the flow of fluid inside the cylinder using vectors in the center plane. The injection of hydrogen is shown in black, and the vectors are colored by velocity magnitude using a rainbow color scheme. The combustion flame front, valves, and piston are colored by temperature using a similar color scheme. The final view (0:51-1:11) highlights the mesh passing through the spark plug and injector. The mesh is colored with red denoting areas of high temperature and blue denoting areas of low temperature. Near the end of the simulation, ignition and combustion are shown after CONVERGE’s AMR is applied, emphasizing how this feature automatically refines the mesh at specific locations. Convergent Science's CONVERGE is an innovative computational fluid dynamics (CFD) software that eliminates the grid generation bottleneck from the simulation process through autonomous meshing.