Cryogenic wind tunnels: Problems of continuous operation at low temperatures

The design of a cryogenic wind tunnel which operates continuously, and is capable of attaining transonic speeds at generating pressures of about 3 bars is described. Its stainless steel construction with inside insulation allows for very rapid temperature variations promoted by rapid changes in the liquid nitrogen flow. A comparative study of temperature measuring probes shows a good reliability of thin sheet thermocouples. To measure fluctuations, only a cold wire makes it possible to record frequencies of about 300 Hz. The use of an integral computer method makes it possible to determine the impact of the wall temperature ratio to the adiabatic wall temperature for the various parameters characterizing the boundary layer. These cases are processed with positive and negative pressure gradients

Ensemble Concerts: Contemporary Percussion Quintet, February 21, 1972

Annual TourFebruary 21-23, 1972State of Michiga

Ensemble Concerts: Percussion Ensembles, May 16, 1973

Centennial East Recital HallWednesday EveningMay 16, 19738:15 p.m

Ensemble Concerts: Percussion Ensembles, May 17, 1972

Centennial East Recital HallWednesday EveningMay 17,19728:15 p.m

Ensemble Concerts: Contemporary and Concert Percussion Ensemble, October 9, 1974

Centennial East Recital HallWednesday EveningOctober 9, 19748:15 p.m

Ensemble Concerts: Mallet and Concert Percussion Ensemble, January 23, 1974

Centennial East Recital HallWednesday EveningJanuary 23, 19748:15 p.m

Ensemble Concerts: Contemporary Percussion Quintet, 1973

Annual Tour1973-7

Ensemble Concerts: Contemporary Percussion Quintet and Concert Percussion Ensemble, October 1, 1973

University of IllinoisMonday AfternoonOctober 1, 19734:00 p.m

Ensemble Concerts: The Varsity Band, May 13, 1971

Student UnionMay 13, 19718:15 p.m

Ensemble Concerts: Percussion Pops, November 10, 1976

Centennial East Recital HallWednesday EveningNovember 10, 19768:00 p.m