Design and Test of a Small-Scale, Additively-Manufactured, Liquid-Cooled Rocket Nozzle

Durkee, Matt; McCain, Connor; Quinton, Andrew; Stewart, Kathryn; Utley, Lucas; Rouser, Kurt P.

doi:10.2514/6.2020-1122

Cited by 2 publications

(1 citation statement)

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“…This microscale manufacturability has implications for the design and fabrication of flow devices. Devices such as injectors, nozzles, and heat exchangers are capable of being printed using AM (Petrovic et al 2011;Anilli et al 2018;Townsend et al 2016;Anderson et al 2020;Waters 2018;Steitz et al 2013;Durkee et al 2020;Tommila et al 2021) while reducing part and labor complexity. SpaceX has experimented with printing thrust chambers and flown printed oxidizer valve housings to reduce lead time and expense (Howell 2014).…”

Section: Introductionmentioning

confidence: 99%

Understanding Flow Characteristics in Metal Additive Manufacturing

et al. 2021

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In fluid flow, the frictional effects from interior surfaces of flow components create pressure loss across the surface. Understanding this inherent pressure loss due to friction and other phenomena is important when designing a flow system. For conventional manufacturing, friction loss has been empirically studied and is well known in the engineering community. However, newer manufacturing techniques, such as laser powder bed fusion (LPBF), an additive manufacturing technique, need to be understood. The inherent flow conditions resulting from the additive processes were studied. Test samples were printed with the flow path oriented in the vertical direction with different channel diameters to characterize the inherent fundamental flow properties of the process. Moody diagrams were replicated for a greater understanding of possibilities and shortfalls when implementing LPBF into design applications. Experimental flow testing revealed that greater effective sand grain roughness resulted from this process when compared to conventional machining methods. This roughness did not correlate well to the average roughness measured with a laser scanning microscope but was consistent with the average particle size of the powder metal feedstock.

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