RDHWT/MARIAH II Energy Addition Modeling and Experiments Review Conference Paper uri icon

abstract

  • The viability of the Radiatively-Driven Hypersonic Wind Tunnel (RDHWT)/ MARIAH II project rests on our ability to controllably and predictably add energy to a supersonic air flow downstream of the throat with a high power electron beam. Experiments conducted at Sandia National Laboratories during the Spring of 2003 deposited over 800 KW of power into the flow in a successful demonstration of that concept. A detailed analysis of the streamwise pressure distribution and other flow variables led to several quantitative disagreements with the predictive models that are currently being used. Much of this disagreement appears to have arisen because the electron beam was clipped by apertures inside the accelerator, leading to large fluctuations in beam current during the run. Recent models suggest that, in addition to electron beam loss at these apertures, scattering may have introduced helicity into the trajectory of the electrons in the electron beam, leading to reduced penetration depth.

author list (cited authors)

  • Miles, R., Mansfield, D., Girgis, I., Brown, G., Lipinski, R., & Lockner, T.

publication date

  • December 2004