Ultrafast and Quantitative X-Tomography and Simulation of Hollow-Cone Gasoline Direct-Injection Sprays

摘要: Gasoline direct injection (GDI) has the potential to greatly improve internal combustion engine performance through precise control of rate, timing, and fuel. A thorough characterization hydrodynamics fuel come from a precise, quantitative analysis sprays, especially in near-nozzle region. lack knowledge fuel-spray dynamics severely limited computational modeling sprays design improved systems. Previously, structure highly transient have never been visualized or reconstructed three dimensions (3D) due numerous technical difficulties. By using an ultrafast x-ray detector intense monochromatic beams synchrotron radiation, fine structures 1-ms GDI outwardly opening nozzle were elucidated by newly developed, ultrafast, microsecond computed microtomography (CT) technique. In time-resolved manner, many detailed features associated with flows are readily observable quantitatively 3D spray density distribution as result CT More importantly, fluid (CFD) simulation based on Taylor analogy breakup (TAB) model also performed boundary initial conditions obtainedmore » experiment data. The experimental numerical results good agreement quantitatively. These not only reveal characteristics unprecedented detail, but will facilitate realistic dynamic simulations transient, multiphase systems.« less