在天然气发动机中,天然气和柴油射流的喷射及混合过程对燃烧排放性能有重要影响。本文基于AVL FIRE软件,模拟了定容燃烧腔内高压天然气和柴油射流喷射过程,分析了不同喷孔高度、喷孔倾斜角以及喷孔交角下柴油和天然气射流的混合情况,研究结果表明喷孔高度,倾斜角,交角与喷雾贯穿距呈正比,柴油喷雾贯穿距是影响雾化质量的重要因素。喷孔相对位置中喷孔交角因素对射流的影响最大,对柴油喷雾的雾化效果提升明显。 In natural gas engines, injection and mixing of natural gas and diesel jets have a significant impact on combustion emissions. Based on the AVL FIRE software, the injection process of high pressure natural gas and diesel jet in a constant volume combustion chamber was simulated, and the mixing of diesel and natural gas jet at different injection hole heights, nozzle hole inclination angle and nozzle cross angle was analyzed. The height, inclination angle and intersection angle are in direct proportion to the penetration through the spray. The penetration of diesel spray is an important factor that affects the atomization quality. Jet nozzle hole in the relative position of the jet angle of the greatest impact on the jet, the atomization effect of diesel spray to enhance significantly.