Abstract
Computational fluid dynamics (CFD) simulation was performed to investigate flow inside MEMS-based ejectors. The ejector is a microdevice to supply air to microcombustors using the jet of liquid gas fuel ejected from a nozzle. The simulation results were compared with experimental results, and found to show fair coincidence with them. Thus, the CFD simulation is useful to understand the experimental results, find problems and finally improve the performance of the ejector. For example, the CFD simulation confirmed that sudden increase in sucked air at a certain flow rate of ejected gas was due to supersonic flow outside the nozzle. It also found the problem that the ejected gas and sucked air were not fully mixed in the ejector.
