Reactive and nonreactive Reynolds-averaged Navier–Stokes simulations of hydrogen injection into a confined transverse supersonic flow of vitiated air are conducted. The corresponding conditions were studied in the LAPCAT-II combustor. Two operating conditions are considered, which differ in the value of the momentum ratio between the hydrogen and vitiated air inlet streams, thus leading to two distinct values of the equivalence ratio (ER). For its smallest value, smooth combustion develops subject to a preliminary thermal runaway period, while for its largest value, combustion is more strongly intertwined with shock wave dynamics and boundary layer separation. Special emphasis is placed on the possible effects of wall roughness on this reactive flow development. One among the conclusions of preliminary computational analyses of the present flowfield is that it may play a significant role on combustion development. This is firmly confirmed in the present study, which takes explicitly the influence of wall roughness into account within the equivalent sand grain modeling framework. For the largest ER value, the combustion stabilization mechanism is found to change dramatically whether roughness is taken into account or not. Its influence is assessed through a detailed comparison with available experimental data.

进行了反应性和非反应性的雷诺平均Navier-Stokes模拟，模拟了将氢注入到受限的横向超音速气流中的情况。在LAPCAT-II燃烧器中研究了相应的条件。考虑了两个操作条件，这两个条件在氢气和经过空气净化的进气流之间的动量比值不同，因此导致两个不同的当量比（ER）值。就其最小值而言，在初步热失控期后会发展出平稳燃烧，而对于其最大值而言，燃烧与冲击波动力学和边界层分离更紧密地交织在一起。特别强调的是壁面粗糙度对该反应流发展的可能影响。当前流场的初步计算分析的结论之一是，它可能对燃烧的发展起重要作用。这在本研究中得到了肯定的证实，该研究在等效的沙粒建模框架内明确考虑了壁面粗糙度的影响。对于最大的ER值，无论是否考虑粗糙度，都会发现燃烧稳定机制发生了巨大变化。通过与现有实验数据进行详细比较来评估其影响。无论是否考虑粗糙度，燃烧稳定机制都会发生巨大变化。通过与现有实验数据进行详细比较来评估其影响。无论是否考虑粗糙度，燃烧稳定机制都会发生巨大变化。通过与现有实验数据进行详细比较来评估其影响。