Asymmetric Flow State Switching on the Space Launch System (SLS) Block 2 Crew Vehicle

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Asymmetric Flow State Switching on the Space Launch System (SLS) Block 2 Crew Vehicle

Lee J. Mears / Jesse G. Collins / Patrick R. Shea / Jeremy T. Pinier / D. Cole Burnette / Samantha Gildersleeve / Jenna L. Eppink / C. S. Yao / Scott Bartram / Luther Jenkins

Abstract

An in-depth investigation was conducted at the NASA Langley Research Center 14- by 22-Foot Subsonic Tunnel to evaluate flow state switching in the liftoff flow environment of the Space Launch System Block 2 Crew launch vehicle using side force measurements, two-component particle image velocimetry, and tufts flow visualization. Multimodal flow states were observed in the gap flow between the centerbody and solid rocket boosters at a range of incoming flow angles and were characterized for the relative strength of state switches. When flow switches occur, the flow is predominantly bimodal, but trimodal flow states are observed with the launch tower downstream of the vehicle. Tufts visualization indicates three-dimensionality during flow state switching, which initiates at one part of the gap and quickly transitions throughout the length of the booster. Due to the long time scales between switches, statistics such as frequency of flow state switches and converged state probabilities cannot be established without significantly increased acquisition times.

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Document information

Title :

Asymmetric Flow State Switching on the Space Launch System (SLS) Block 2 Crew Vehicle

Contributors:

Lee J. Mears (author) / Jesse G. Collins (author) / Patrick R. Shea (author) / Jeremy T. Pinier (author) / D. Cole Burnette (author) / Samantha Gildersleeve (author) / Jenna L. Eppink (author) / C. S. Yao (author) / Scott Bartram (author) / Luther Jenkins (author)

Conference:

AIAA SciTech Forum 2024 ; 2024 ; Orlando, FL, US

Type of media :

Miscellaneous

Type of material :

No indication

Language :

English

Keywords :

Aerodynamics