Control of large cryogenic tunnelsFor the efficient and economic operation of large cryogenic wind tunnels, automatic control is necessary to precisely regulate the temperature, pressure, and Mach number. The features of the control system currently in operation at the U.S. National Transonic Facility are presented. Some unique features of the tunnel temperature control law are the automatic tunnel cool down utilizing structural temperature feedback and the fan power based liquid nitrogen nozzle switching logic that have played a key role in realizing good automatic tunnel control.
Document ID
19920074137
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Balakrishna, S. (NASA Langley Research Center Hampton, VA, United States)
Kilgore, W. A. (Vigyan, Inc. Hampton, VA, United States)
Thibodeaux, J. J. (NASA Langley Research Center Hampton, VA, United States)