Measurement of Disturbance Levels in the Langley Research Center 20-Inch Mach 6Tunnel

摘要

Constant-temperature anemometry was used to measure the disturbance levels in theLangley Research Center 20-inch Mach 6 Tunnel over a limited range of total pressures. The measurements were made using a dual wire probe where each wire was operated at a high but different overheat. The fluctuating voltages were digitized and a system of two equations was solved to obtain the instantaneous mass flow and total temperature fluctuations as a function of time. Statistical techniques were used to obtain statistical quantities of interest.