Combustion Control Using Premixed-Diffusion Hybrid Combustion Method

通常，预混合充量火花点火系统用于氢燃料内燃机。然而，在该燃烧系统中，氢混合物的火焰传播速度过高，使得操作条件受到限制。在这项研究中，为了控制氢混合气的燃烧，燃料-空气混合气浓度的非均匀性被应用。在近化学计量比区域，燃烧主要由火焰传播速度控制，而在富燃或贫燃区域，燃烧主要由混合控制。为了形成非均匀混合气，采用了高速非定常射流，并将该系统用于真实的发动机。

Generally, a premixed-charge spark-ignition system is used for the hydrogen-fueled internal-combustion engine. However in this combustion system, the flame propagation speed of the hydrogen mixture is excessively high, so that an operating condition is restricted. In this study, in order to control the combustion of the hydrogen mixture, non-homogeneity of fuel-air mixture concentration is applied. In the near stoichiometric region, the combustion dominated by the flame propagation speed, and in the rich or lean region the combustion dominated by mixing. Here, in order to form the non-homogeneous mixture, a high-speed unsteady-jet was used, and this system was used for a real engine.