Experimental investigations for lifetime prediction (D09)

为了提高对喷嘴寿命的理解，TP D9将利用第二FP中开发的测试台进行可靠的实验，采用创新的测量方法，包括热气流，定义结构表面的热流，喷嘴结构，与热气流和冷却剂流动的相互作用，以及冷却管道内的流动，从金属壁上对流的热量。现在的工作重点是使燃烧压力加倍，以达到更高的热通量。分析了表面粗糙度对传热（热气体和冷却管道侧）的影响。最后，热障涂层在损伤防护方面的应用将有所提高。

To improve the understanding of the nozzle lifetime TP D9 will exploit the test stands developed in the 2nd FP for reliable experiments with innovative measuring comprising the hot gas flow, defining the heat flux to the structural surface, the nozzle structure, interacting with hot gas and coolant flow, and the flow inside the cooling ducts, convecting the heat from the metallic walls. A focus of work is now a doubling of the com-bustion pressure, to reach significantly higher heat fluxes. The influence of the surface roughness on heat transfer (hot gas and cooling duct side) will be analyzed. Finally, the application of thermal barrier coatings will show the improvement regarding damage protection.