为了深入理解全流量补燃循环发动机系统的特点,建立了全流量补燃循环发动机系统动力平衡模型,补充了压力平衡方程,研究了预燃室混合比对发动机系统参数的影响规律.研究结果表明:①富燃、富氧预燃室的混合比是相互匹配的,随着富燃预燃室混合比增大,富氧预燃室混合比减小,混合比组合的规律是保持富燃、富氧预燃室燃气做功能力的平衡;②随着富燃预燃室混合比增大,预燃室燃气温度升高,富燃预燃室燃气流量增大(富氧预燃室燃气流量减小),燃气做功能力增强,燃料泵(氧化剂泵)的扬程降低;③预燃室混合比直接决定了预燃室燃气温度,影响了预燃室燃气物性参数,参与了发动机系统的流量分配,控制了系统燃气做功能力,最终影响了泵的扬程. In order to further understand the characteristics of a full-flow co-combustion engine system, a dynamic equilibrium model of a full-flow co-combustion engine system was established, and the pressure balance equation was supplemented to study the effect of pre-combustion chamber mixing ratio on the engine system parameters.The results show : ① rich, oxygen-rich pre-combustion chamber mixing ratio is matched with each other, with the pre-combustion chamber rich mixture ratio increases, oxygen-rich pre-combustion chamber mixture ratio decreases, the combination of mixing ratio is to maintain rich fuel, Oxygen-rich pre-combustion chamber gas balance function; ② With the rich combustion pre-combustion chamber mixing ratio increases, pre-combustion chamber gas temperature increases, rich combustion chamber gas flow increases (oxygen-rich pre-combustion chamber gas flow Reduce), the gas power to enhance the work function, reducing the lift of the fuel pump (oxidant pump); ③ pre-combustion chamber mixture ratio directly determines the pre-combustion chamber gas temperature, affecting pre-chamber gas physical parameters involved in the engine system flow Distribution, control of the gas system to do work, ultimately affecting the pump head.