Abstract Combustion in porous media has been identified as a promising technology for achieving higher burning rates, extending flammability limits, and reducing emissions. To assess the viability of this technology for application to aviation gas-turbine engines, the performance of a Porous Media Burner (PMB) operated with pre-vaporized liquid fuel at high pressures is experimentally examined. The PMB was operated at fuel-lean equivalence ratios between 0.4 and 0.55 at pressures up to 20 bar with fully pre-vaporized and preheated n-heptane as well as gaseous methane at 8 bar for performance comparison. Combustion stability maps are reported along with temperature profiles, pressure drops, and emissions of CO and NOx at stable operating conditions. Results from these experiments show excellent performance of PMBs at high-pressure conditions. Additionally, numerical simulations using the volume-averaged, one-dimensional reacting flow-equations complement the experimental measurements to provide further insight into the effects of the pressure and fuel mixture on the flame structure. Lastly, high-resolution es X-ray Computed Tomography (XCT) is used to examine the structural integrity of the porous matrix during the high-pressure combustion operation, showing evidence of micro-fissures and an increase in the surface roughness due to SiC-oxidation. Large-scale defects were not observed after four days of cyclic high-pressure testing over a wide range of pressures, heating rates, and equivalence ratios.

中文翻译：

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在高达 20 bar 的高压下多孔介质燃烧器中贫预混预汽化液体燃料燃烧的实验研究

摘要 多孔介质中的燃烧已被确定为实现更高燃烧率、扩展可燃性限制和减少排放的有前途的技术。为了评估该技术应用于航空燃气涡轮发动机的可行性，对在高压下使用预汽化液体燃料运行的多孔介质燃烧器 (PMB) 的性能进行了实验检查。PMB 以 0.4 到 0.55 的贫燃料当量比在高达 20 巴的压力下使用完全预蒸发和预热的正庚烷以及 8 巴的气态甲烷进行性能比较。燃烧稳定性图与稳定运行条件下的温度曲线、压降以及 CO 和 NOx 排放一起报告。这些实验的结果表明 PMB 在高压条件下具有出色的性能。此外，使用体积平均、一维反应流动方程的数值模拟补充了实验测量，以进一步了解压力和燃料混合物对火焰结构的影响。最后，高分辨率 es X 射线计算机断层扫描 (XCT) 用于检查高压燃烧操作期间多孔基体的结构完整性，显示出微裂缝的证据和由于 SiC-氧化。在广泛的压力、加热速率和当量比范围内进行四天循环高压测试后，未观察到大规模缺陷。一维反应流方程补充了实验测量，以进一步了解压力和燃料混合物对火焰结构的影响。最后，高分辨率 es X 射线计算机断层扫描 (XCT) 用于检查高压燃烧操作期间多孔基体的结构完整性，显示出微裂缝的证据和由于 SiC-氧化。在广泛的压力、加热速率和当量比范围内进行四天循环高压测试后，未观察到大规模缺陷。一维反应流方程补充了实验测量，以进一步了解压力和燃料混合物对火焰结构的影响。最后，高分辨率 es X 射线计算机断层扫描 (XCT) 用于检查高压燃烧操作期间多孔基体的结构完整性，显示出微裂缝的证据和由于 SiC-氧化。在广泛的压力、加热速率和当量比范围内进行四天循环高压测试后，未观察到大规模缺陷。由于 SiC 氧化，显示出微裂纹和表面粗糙度增加的证据。在广泛的压力、加热速率和当量比范围内进行四天循环高压测试后，未观察到大规模缺陷。由于 SiC 氧化，显示出微裂纹和表面粗糙度增加的证据。在广泛的压力、加热速率和当量比范围内进行四天循环高压测试后，未观察到大规模缺陷。