ABSTRACT

In the context of emission-free electricity generation, the authors developed a novel hydrogen-oxygen combustor, which is based on swirl-stabilized combustion technology and steam dilution. Following previous burner characterization, the current study investigates the heat transfer conditions in the combustion chamber wall. To this end, a carefully controlled co-flow of air is used to cool the combustion chamber in an annular duct, which surrounds it. Temperature measurements enable the evaluation of the heat flux from the combustor flow to the walls, local wall temperatures, and the Nusselt numbers on the hot and the cold side. The extremely high wall temperatures, caused by the H₂/O₂ flame, can be reduced by steam dilution down to approximately 900 K. Even better cooling could be reached by using the dilution steam as the coolant before it flows to the plenum. The Nusselt numbers at the inner combustion chamber wall are in the order of 10–50 and increase with the thermal power and the steam dilution ratio.

摘要

在无排放发电的背景下，作者开发了一种基于涡流稳定燃烧技术和蒸汽稀释的新型氢氧燃烧器。根据先前的燃烧器特性，目前的研究调查了燃烧室壁中的传热条件。为此，精心控制的空气协同流动用于冷却环绕燃烧室的环形管道中的燃烧室。温度测量能够评估从燃烧器流到壁的热通量、局部壁温以及热侧和冷侧的努塞尔数。由 H ₂ /O ₂引起的极高壁温火焰，可以通过蒸汽稀释降低到大约 900 K。通过使用稀释蒸汽作为冷却剂，可以达到更好的冷却效果，然后再流入增压室。内燃烧室壁的努塞尔数在 10-50 的数量级，并随着热功率和蒸汽稀释比的增加而增加。