Combustion Control Using Premixed-Diffusion Hybrid Combustion Method

氢燃料内燃机一般采用预混式火花点火系统。然而，在该燃烧系统中，氢混合物的火焰传播速度过快，从而限制了操作条件。在本研究中，为了控制氢气混合物的燃烧，采用了燃料-空气混合物浓度的非均匀性。在近化学计量比区域，燃烧以火焰传播速度为主，在浓淡区域，燃烧以混合为主。这里，为了形成非均匀混合气，采用了高速非定常射流，并将该系统用于实际发动机。

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.