Structural Cooldown Energy Optimization for Cryogenic Wind Tunnels

  • S. Balakrishna
  • W. A. Kilgore
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 39)


High Reynolds number cryogenic nitrogen tunnels usually have considerable mass of structural metal within the insulated test environment. Prior to high Reynolds number aerodynamic testing, this internal structure is cooled from ambient temperature to 120K using liquid nitrogen. This paper studies the structural cooldown as a problem of optimizing liquid nitrogen consumption and time for the U.S National Transonic Facility. A simple model of the tunnel thermodynamic process is used to study the optimization and cooldown strategies via nonlinear dynamical simulation.


Mach Number Test Section Inlet Guide Vane Tunnel Pressure Tunnel Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    W.E.Bruce, D.E.Fuller, and W.B.Igoe, The National Transonic Facility shakedown test results and calibration plans, AIAA 84-0584, Aerodynamic testing conf (1984).Google Scholar
  2. 2.
    W.E.Bruce, and B.B Gloss, The U.S National Transonic Facility, Special course in cryogenic wind tunnel technology, von Karman Inst, AGARD 774-R (1989).Google Scholar
  3. 3.
    S.Balakrishna, Synthesis of a control model for a liquid nitrogen cooled closed circuit nitrogen wind tunnel and its validation, NASA CR-162508 (1980).Google Scholar
  4. 4.
    S.Balakrishna, W.A.Kilgore, and J.J. Thibodeaux, Control of large cryogenic tunnels, AIAA CP 92-3930, Aerospace ground testing conference (1992).Google Scholar
  5. 5.
    H. Elmquist, K.J.Astrom, T.Sconthal, and W. Wittenmark, “Users guide to SIMNON”. SSPA Systems (1990).Google Scholar
  6. 6.
    S. Balakrishna, W.A.Kilgore, Microcomputer based controller for the NASA Langley 0.3-m Transonic Cryogenic wind Tunnel, NASA CR-181308 (1989).Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • S. Balakrishna
    • 1
  • W. A. Kilgore
    • 1
  1. 1.Vigyan Inc.HamptonUSA

Personalised recommendations