Two Independent Calibration Methods Used in Testing Low Mass Flow Rate Sensors in Electrogasdynamic Facilities

摘要

Development of a system for measuring the mass flux profiles in an arc heated gasdynamic wind tunnel is described. Two independent calibration systems were developed for calibrating the low mass flow rate meter. One system is based on the pressure rise method and the other on the positive displacement technique. A combination mass flux and impact pressure probe was designed and utilized as a flow diagnostic instrument. The mass flux measuring system was capable of measuring rates of flow from .00000025 to .0004 pounds per second at test section simulated altitudes of 160,000 feet. Dynamic response of the flowmeter permitted continuous traverses of the core of the flow at speeds of 0.5 inch per second. Comparisons are made between mass flow rates as measured by the facility mass flowmetering system and those obtained by integrating the mass flux probe data. (Author)