Nozzle design optimization for axisymmetric scramjets by using surrogate-assisted evolutionary algorithms
Nozzle design optimization for axisymmetric scramjets by using surrogate-assisted evolutionary algorithms
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DOI：
10.2514/1.b34482
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发表时间：
2012-11
影响因子：
1.9
通讯作者：
H. Ogawa;R. Boyce
中科院分区：
文献类型：
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作者：
H. Ogawa;R. Boyce
超燃冲压发动机推进是一种很有前途的高超音速吸气技术，为高效、灵活地进入太空和高速大气运输提供了潜力。在一系列运行条件下的稳健喷嘴设计对于超燃冲压发动机的成功运行至关重要。在本文中，使用替代辅助进化算法进行形状优化，以最大化轴对称超燃冲压发动机喷嘴配置产生的推力，包括在有燃料和无燃料的两个高度上以 8 马赫的巡航条件下的基本流量和外表面。优化结果已通过耦合数值/分析方法进行检查，以确定关键设计因素并研究设计参数的影响。已经发现，最佳喷嘴几何形状的特征在于燃料开启情况下的钟形形状，而燃料关闭情况下的最佳形状特征为接近圆锥形的形状。它们在推力产生方面的稳健性已通过在非设计高度处交叉参考最佳几何形状得到证明。已发现喷嘴长度和半径是所有考虑条件下最有影响的参数，其最佳值是根据无粘性和粘性分力之间的平衡确定的，而其他参数对总轴向力影响较小。版权
Scramjet propulsion is a promising hypersonic airbreathing technology that offers the potential for efficient and flexible access to space and high-speed atmospheric transport. Robust nozzle design over a range of operating conditions is of critical importance for successful scramjet operation. In this paper, shape optimization has been performed with surrogate-assisted evolutionary algorithms to maximize the thrust generated by an axisymmetric scramjet nozzle configuration, including the base flow and external surface for cruise conditions at Mach 8 at two altitudes with and without fuel. The optimization results have been examined in a coupled numerical/analytical approach in order to identify the key design factors and investigate the effects of design parameters. It has been found that the optimum nozzle geometries are characterized by bell-type shapes for the fuel-on conditions, whereas the optima for the fuel-off case feature nearly conical shapes. Their robustness in thrust production has been demonstrated by cross- referencing the optimum geometries at off-design altitudes. The nozzle length and radius have been found to be the most influential parameters in all considered conditions, with their optimum values determined based on the balance between inviscid and viscous force components, whereas the other parameters have minor impact on the total axial force. Copyright