ENTHALPY BY ENERGY BALANCE FOR AERODYNAMIC HEATING FACILITY AT NASA AMES RESEARCH CENTER ARC JET COMPLEX

摘要

The NASA Ames Research Center (ARC) Arc Jet Facilities’ Aerodynamic Heating Facility (AHF) hasbeen instrumented for the Enthalpy By Energy Balance (EB2) method. Diagnostic EB2 data is routinelytaken for all AHF runs. This paper provides an overview of the EB2 method implemented in the AHF.The chief advantage of the AHF implementation over earlier versions is the non-intrusiveness of theinstruments used. For example, to measure the change in cooling water temperature, thin film 1000 ohmResistance Temperature Detectors (RTDs) are used with an Anderson Current Loop (ACL) as the signalconditioner. The ACL with 1000 ohm RTDs allows for very sensitive measurement of the increase intemperature (Delta T) of the cooling water to the arc heater, which is a critical element of the EB2method. Cooling water flow rates are measured with non-intrusive ultrasonic flow meters.