EKC2023

[P47-MA]Analysis of cooling performance according to the thickness of the pintle outer wall

Not scheduled

20m

Poster Poster(Wed)

Speaker

Prof. Hwanil Huh (Department of Aerospace Engineering, Chungnam National University, Daejeon, Republic of Korea)

Description

Altitude compensation nozzle can improve the performance of launch vehicle and reduce development cost by changing only the nozzle shape for the same engine. Among these altitude compensation nozzles, the ED (Expanion-Deflection) nozzle has an altitude compensation effect through a change in the effective nozzle exit area using a pintle fixed therein. In addition, the ED nozzle has the possibility of improving the Inert mass fraction because it can reduce the length of the nozzle extension part as well as the height compensation effect. Through the performance analysis of the ED nozzle at EADS and ESA in Europe, it was confirmed that it could increase the payload weight compared to the existing Arian 5 upper engine [1]. Since the pintle of the ED nozzle is located in the center of the nozzle, it is directly exposed to high-temperature and high-pressure combustion gas of 3000 K or higher, and thermal deformation may occur. Since this can lead to deterioration of combustor performance, the pintle of the ED nozzle needs to be designed with cooling in mind. In general, cooling methods applied in a high-temperature and high-pressure environment such as inside a combustor include regenerative cooling, film cooling, and ablation cooling. Among them, the regenerative cooling method does not waste fuel, and it has been reported that the combustor performance is improved due to the propellant preheating effect.
In this study, prior to the regenerative cooling design of the ED nozzle pintle, 1D thermal analysis was performed to confirm the effect of the pintle outer wall thickness among the pintle design variables on the cooling performance. Study shows, as the outer wall thickness of the pintle increased, the pintle outer wall temperature increased and the coolant temperature change decreased. We plan to use the results of this study to design a regenerative cooling channel inside the pintle.

References

[1] Goetz, A., Hagemann, G. and Kretschmer, J., “Advanced Upper Stage Propulsion Concept-The Expansion-Deflection Upper Stage,” 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2005