In　order　to　find　out　the　impact　of　ignition　charge　on　ignition　process　in　the　second　pulse,　a　model　was　established.The　axisymmetric　unsteady　NavierStokes　equation　and　the　standard　kΕ　turbulence　model　were　used　to　simulate　the　second　pulse　ignition　process.Based　on　that,　the　impacts　of　the　igniter　working　duration　and　ignition　gas　flow　rate　on　the　ignition　delay　were　studied.The　results　showed　that:when　the　ignition　gas　flow　rate　was　constant,　increasing　the　igniter　working　duration　can　effectively　shorten　the　second　pulse　ignition　delay,　and　there　existed　a　limit　value　of　the　ignition　delay,　which　was　defined　as　the　minimum　ignition　delay.Different　ignition　gas　flow　rates　corresponded　to　different　minimum　ignition　delay,　and　the　bigger　ignition　gas　flow　rate　indicated　the　smaller　minimum　ignition　delay.The　ignition　gas　flow　rate　had　a　negative　exponential　relationship　with　the　minimum　ignition　delay.Choosing　the　free　volume　as　the　sum　of　the　first　and　second　pulse　free　volumes　is　more　reasonable　when　calculating　the　second　pulse　ignition　charge.　©　2022,　Editorial　Department　of　Journal　of　Aerospace　Power.　All　right　reserved.