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Development of a distributed-parameter mathematical model for simulation of cryogenic wind tunnelsA one-dimensional distributed-parameter dynamic model of a cryogenic wind tunnel was developed which accounts for internal and external heat transfer, viscous momentum losses, and slotted-test-section dynamics. Boundary conditions imposed by liquid-nitrogen injection, gas venting, and the tunnel fan were included. A time-dependent numerical solution to the resultant set of partial differential equations was obtained on a CDC CYBER 203 vector-processing digital computer at a usable computational rate. Preliminary computational studies were performed by using parameters of the Langley 0.3-Meter Transonic Cryogenic Tunnel. Studies were performed by using parameters from the National Transonic Facility (NTF). The NTF wind-tunnel model was used in the design of control loops for Mach number, total temperature, and total pressure and for determining interactions between the control loops. It was employed in the application of optimal linear-regulator theory and eigenvalue-placement techniques to develop Mach number control laws.
Document ID
19830027465
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Tripp, J. S. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
September 1, 1983
Subject Category
Systems Analysis
Report/Patent Number
NAS 1.60:2177
NASA-TP-2177
L-15591
Accession Number
83N35736
Funding Number(s)
PROJECT: RTOP 505-31-53-09
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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