基于伴随求解器的PEMFC喷射器尺寸优化

喷射器以其体积小、无运动部件等一系列优点，正成为氢燃料电池氢气再循环的理想解决方案。通过使用计算流体动力学(computation fluid dynamic, CFD)模拟了燃料电池氢循环喷射器不同进口压力下，喷射器内部流场情况，通过伴随方法找出了对引射比的影响最大的喷射器位置，获取了多组工况下喷射器内部压力场、速度场、质量分布场，分析了喷射器尺寸在不同工况下对喷射器性能的影响规律，并通过伴随方法对喷射器尺寸进行优化显著提升了引射比。结果表明：通过伴随方法分析后，得出喉口处对喷射器引射比影响最大，通过伴随方法优化模型后，各工况下喷射器引射比平均提23%。结果有助于未来宽工况喷射器的设计。

PEMFC ejector size optimization based on adjoint method

The ejectors are becoming an ideal solution for hydrogen recirculation in hydrogen fuel cells due to their small size and no moving parts. In this paper, CFD (computation fluid dynamic) is used to simulate the internal flow field of the fuel cell hydrogen cycle injector under different inlet pressures. The internal pressure field, velocity field, and mass distribution field of the ejector under multiple sets of working conditions are analyzed, and the influence of the size of the ejector on the performance of the ejector under different working conditions is analyzed, and the optimization of the size of the ejector by the adjoint method significantly improves the performance of the ejector. shot ratio. The results show that after the analysis by the adjoint method, it is concluded that the throat has the greatest influence on the ejector ejection ratio. After the model is optimized by the adjoint method, the ejector ejection ratio is increased by an average of 23% under each working condition. The results aid the design of future wide-service ejectors.