PHASES I AMD II TECHNICAL REPORT PROGRAM TO DESIGN, FABRICATE, TEST, AMD DELIVER A THERMAL CONTROL-MIXING CONTROL DEVICE FOR GEORGE C. MARSHALL SPACE FLIGHT CENTER

摘要

Phase I of the program, which consisted of the development of a sensor capable of detecting temperature changes as a function of viscosity changes, has been completed. This type of sensor, consisting of an orifice bridge circuit, has resulted in a device with a threshold above internally generated noise of 0.8C (1.5P). Data was obtained using a "noise free" Freon source provided by an air pressurized bladder.nThe pulse duration modulation (PDM) diverter valve has been selected as the valve to be incorporated with the temperature sensor in Phase The diverter valve has been tested and performed with 100-percent flow diversion. In addition, the valve operates with a flow efficiency of at least 95 percent, with the possibility of attaining 100-percent flow efficiency if the vent flow of the PDM can be channeled through the last stage of the diverter valve.