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- 航空旅行轮椅设计，行动不便者的福音
- 作者： Amer Siddiqui Ali Asgar Salim 来源： 工业设计 年份： 2024 文献类型 ： 期刊
- 描述： <正>这是一种新型的航空旅行轮椅，可以帮助行动不便的乘客方便快速地登机和入座。一般来说，乘坐轮椅的乘客在登机后必须转移到飞机上的固定座位，这一过程复杂而艰难。使用该航空旅行轮椅后，这一流程将更加便利，行动不便的乘客可以在从登机口到抵达大厅的整个行程中不需要更换座位。
- Investigation into the Effect of H 2 -Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design
- 作者： Sara Bonuso Pasquale Di Gloria Guido Marseglia Ramón A. Otón Martínez Ghazanfar Mehdi Zubair Ali Shah Antonio Ficarella Maria Grazia De Giorgi 来源： Aerospace 年份： 2023 文献类型 ： 期刊 关键词： burning enrichment high orthogonal lean chemiluminescence proper decomposition hydrogen flame structure speed
- 描述： This study introduces an innovative approach involving the injection of hydrogen into a low-swirl, non-premixed flame, which operates with gaseous fuels derived from an air-blast atomizer designed for aero-engine applications. The aim is to characterize how hydrogen enrichment influences flame structures while maintaining a constant thermal output of 4.6 kW. Using high-speed chemiluminescence imaging, three fueling conditions were compared: the first involved pure methane/air, while the second and third conditions introduced varying levels of hydrogen to an air–methane mixture. The results reveal significant effects of hydrogen enrichment on flame characteristics, including a slightly shorter length and a wider angle attributed to heightened expansion within the Combustion Recirculation Zone. Moreover, the emission of UV light underwent considerable changes, resulting in a shifted luminosity zone and reduced variance. To delve deeper into the underlying mechanisms, the researchers employed Proper Orthogonal Decomposition (POD) and Spectral Proper Orthogonal Decomposition (SPOD) analyses, showing coherent structures and energetic modes within the flames. Hydrogen enrichment led to the development of smaller structures near the nozzle exit, accompanied by longitudinal oscillations and vortex shedding phenomena. These findings contribute to an advanced understanding of hydrogen’s impact on flame characteristics, thereby propelling efforts toward improved flame stability. Additionally, these insights hold significance in the exploration of hydrogen as an alternative energy source with potential environmental benefits.
- Investigation into the Effect of H 2 -Enriched Conditions on the Structure and Stability of Flames in a Low-Swirl Combustor Derived from Aero-Engine Design
- 作者： Sara Bonuso Pasquale Di Gloria Guido Marseglia Ramón A. Otón Martínez Ghazanfar Mehdi Zubair Ali Shah Antonio Ficarella Maria Grazia De Giorgi 来源： Aerospace 年份： 2023 文献类型 ： 期刊 关键词： burning enrichment high orthogonal lean chemiluminescence proper decomposition hydrogen flame structure speed
- 描述： This study introduces an innovative approach involving the injection of hydrogen into a low-swirl, non-premixed flame, which operates with gaseous fuels derived from an air-blast atomizer designed for aero-engine applications. The aim is to characterize how hydrogen enrichment influences flame structures while maintaining a constant thermal output of 4.6 kW. Using high-speed chemiluminescence imaging, three fueling conditions were compared: the first involved pure methane/air, while the second and third conditions introduced varying levels of hydrogen to an air–methane mixture. The results reveal significant effects of hydrogen enrichment on flame characteristics, including a slightly shorter length and a wider angle attributed to heightened expansion within the Combustion Recirculation Zone. Moreover, the emission of UV light underwent considerable changes, resulting in a shifted luminosity zone and reduced variance. To delve deeper into the underlying mechanisms, the researchers employed Proper Orthogonal Decomposition (POD) and Spectral Proper Orthogonal Decomposition (SPOD) analyses, showing coherent structures and energetic modes within the flames. Hydrogen enrichment led to the development of smaller structures near the nozzle exit, accompanied by longitudinal oscillations and vortex shedding phenomena. These findings contribute to an advanced understanding of hydrogen’s impact on flame characteristics, thereby propelling efforts toward improved flame stability. Additionally, these insights hold significance in the exploration of hydrogen as an alternative energy source with potential environmental benefits.