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针对天然气内燃机充气系数下降这一问题，本文提出了缸内直接喷气的基本思想，并对气体喷射器流量特性和点燃式发动机进气门处喷气进行了试验研究，为缸内直接喷气的深入研究奠定了基础。
In order to reduce the gas charge coefficient of natural gas internal combustion engine, this paper puts forward the basic idea of direct jet in cylinder, and conducts experimental research on the flow characteristics of gas ejector and the jet at the inlet of ignited engine. Foundation.