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首页> 外文会议>US National Combustion Meeting >Ignition and Flame Development in Mixing Layers with Applications to CI Engines
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Ignition and Flame Development in Mixing Layers with Applications to CI Engines

机译：用应用于CI发动机的搅拌层的点火和火焰开发

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In prior studies, ignition and flame development in compositionally stratified n-heptane/air mixtures have been studied under uniform high pressure and temperature conditions with application to compression-ignition engines. It was concluded that ignition occurs in the rich mixture and an ignition front then propagates to the flame stabilization location near the stoichiometric mixture fraction. The front propagation was accelerated with increasing gradients when the gradients were smaller than a critical value but decelerated with increasing gradients when the gradients were higher than the critical value. In this work, more realistic engine conditions where both compositional and thermal stratification are simultaneously present are studied. It is shown that ignition again occurs in the rich mixture, but the mixture fraction values are lower than in the uniform temperature case. Ignition delay is reduced with increasing stratification gradient until a critical value is reached after which ignition delay grows as gradient further increases. The mixture fraction where ignition initiates is less sensitive to changes in level of compositional stratification than to initial temperature variation. The studies are then extended to a biodiesel surrogate and to an application relevant to a dual-fuelled engine.
机译：在先前的研究中，在均匀的高压和温度条件下，在均匀的高压和温度条件下研究了在组成分层的正庚烷/空气混合物中的点火和火焰显影。结论是，在富含混合物中发生点火，然后点火前沿在化学计量混合物级分附近传播到火焰稳定位置。当梯度小于临界值时，随着梯度小于临界值，当梯度高于临界值时减速时，梯度增加了前传播。在这项工作中，研究了更现实的发动机条件，其中同时存在组成和热分层。结果表明，点火再次发生在富含混合物中，但混合级分值低于均匀温度壳体。随着分层梯度的增加降低点火延迟，直到达到临界值之后，在点火延迟随着梯度进一步增加时达到临界值。在初始温度变化的情况下，点火引发的混合物级分钟对组合分层水平的变化敏感。然后将研究延伸到生物柴油替代物以及与双燃料发动机相关的应用。

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