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"NASA Technical Reports Server (NTRS) 20140002597: A Computational Fluid Dynamics Study Of Swirling Flow Reduction By Using Anti-vortex Baffle" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 20140002597: A Computational Fluid Dynamics Study Of Swirling Flow Reduction By Using Anti-vortex Baffle” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 20140002597: A Computational Fluid Dynamics Study Of Swirling Flow Reduction By Using Anti-vortex Baffle
  • Author: ➤  
  • Language: English

Edition Identifiers:

  • Internet Archive ID: NASA_NTRS_Archive_20140002597

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"NASA Technical Reports Server (NTRS) 20140002597: A Computational Fluid Dynamics Study Of Swirling Flow Reduction By Using Anti-vortex Baffle" Description:

The Internet Archive:

An anti-vortex baffle is a liquid propellant management device placed adjacent to an outlet of the propellant tank. Its purpose is to substantially reduce or eliminate the formation of free surface dip and vortex, as well as prevent vapor ingestion into the outlet, as the liquid drains out through the flight. To design an effective anti-vortex baffle, Computational Fluid Dynamic (CFD) simulations were undertaken for the NASA Ares I vehicle LOX tank subjected to the simulated flight loads with and without the anti-vortex baffle. The Six Degree-Of-Freedom (6- DOF) dynamics experienced by the Crew Launch Vehicle (CLV) during ascent were modeled by modifying the momentum equations in a CFD code to accommodate the extra body forces from the maneuvering in a non-inertial frame. The present analysis found that due to large moments, the CLV maneuvering has significant impact on the vortical flow generation inside the tank. Roll maneuvering and side loading due to pitch and yaw are shown to induce swirling flow. The vortical flow due to roll is symmetrical with respect to the tank centerline, while those induced by pitch and yaw maneuverings showed two vortices side by side. The study found that without the anti-vortex baffle, the swirling flow caused surface dip during the late stage of drainage and hence early vapor ingestion. The flow can also be non-uniform in the drainage pipe as the secondary swirling flow velocity component can be as high as 10% of the draining velocity. An analysis of the vortex dynamics shows that the swirling flow in the drainage pipe during the Upper Stage burn is mainly the result of residual vortices inside the tank due to conservation of angular momentum. The study demonstrated that the swirling flow in the drainage pipe can be effectively suppressed by employing the anti-vortex baffle.

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  • Number of Files: 12
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  • Added Date: 2016-11-14 13:59:04
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