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Magnetohydrodynamic Drag Force Measurements in an Expansion Tunnel Using a Stress Wave Force Balance by Daniel R. Smith; David E. Gildfind; David J. Mee; Christopher M. James; Barry V. Allsop is a Engineering article available to read on EtoBox.

What is Magnetohydrodynamic Drag Force Measurements in an Expansion Tunnel Using a Stress Wave Force Balance about?

## Magnetohydrodynamic (MHD) aerobraking has the potential to significantly reduce peak heat loads for high-speed planetary entry, due to increases in total drag force in the early phase of the trajectory. Establishing accurate techniques for measuring MHD drag force in ground testing facilities is a necessary first step for investigating this phenomenon. The objective of this paper is to demonstrate the methodology required for using a stress wave force balance (SWFB) to measure MHD drag force in an expansion tunnel. Whilst the SWFB is an established technique for measurement of short duration forces in impulse wind tunnel facilities, conventional designs exhibit unusually low signal-to-noise ratios in MHD ground testing flow fields, due to electromagnetic interference from the plasma in the shock layer. This paper investigates the effect that sting design, amplifier setup, and strain gauge location have on the signal-to-noise ratio of a SWFB. Experimental validation of each design was undertaken in the X2 expansion tunnel with a high enthalpy ( ∼ 16 MJ kg -1 ) argon test flow by comparing the results to those obtained using an accelerometer-based force balance. The results demon

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Author

Daniel R. Smith; David E. Gildfind; David J. Mee; Christopher M. James; Barry V. Allsop

Publisher

Springer Science and Business Media LLC

Published

2020

Language

EN

Field

Engineering (Physical Sciences)