Integration of Dew Point Measurement into the T-38 Wind Tunnel Data Acquisition System

 

Vladimir Lapčević

Aleksandar Vitić

 

In this paper a device for the measurement of the dew point in the wind tunnel T-38 and its connection to the acquisition system is presented. The dew point is the temperature at which the water vapor in a volume of humid air condenses into liquid water at a constant barometric pressure. The dew point is measured by a device named Hygromoc 770s. In the past, the dew point was measured in the T-38 wind tunnel and shown on display but it was not recorded in the data base. The dew point sensor was out of the data acquisition system. The dew point is a very important parameter during test run of the wind tunnel, especially for tests at high Mach numbers. The equipment presented in this paper enables that the sensor of the dew point is connected to the data acquisition system and that the value of the dew point is recorded into the data files with all other parameters during test runs in the T-38 wind tunnel.

Key words: wind tunnel, data acquisition system, dew point.