Abstract:Achieving by the year 2010 a significant reduction in part count, cost, size and weight of turbopumps, and improving their reliability and efficiency is accomplished with a series of innovative single stage high head (150,000-200,000 ft) demonstrator pumps which identify critical technological… more
Abstract:It has been proven, for gas turbines, that brush seals exhibit substantially lower leakage in close clearance areas than conventional labyrinth seals. Direct efficiency gains from reducing seal leakage losses in turbopumps with brush seals potentially amounts to several percent of the total pump… more
Abstract:High Pressure Compressor (HPC) pressure ratios of up to 40:1 are required to achieve 100:1 cycle pressure ratios. A multi-stage axial HPC configuration will be too long and heavy and too inefficient in later stages (at these higher pressure ratios). Increased tip clearance to span ratio will also… more
Abstract:Low cost compact diffusers are needed for small gas turbine compressor stages to economically minimize centrifugal compressor overall diameter yet permit high efficiency and wide operating range. The proposer has performed over 130 different detailed tests (on more than 40 different stage… more
Abstract:High cycle fatigue of turbine engines is of vital concern to the Navy. The proposed project applies an innovative measurement system for blade vibration to an engine health monitoring (EHM) system for monitoring and avoiding HCF damage in turbine engine fans and compressors. Although technical… more
Abstract:Tunable HF/VHF filters capable of operating at high power levels are needed for preventing a jammer from interfering with nearby friendly communications, high-speed antenna tuners, and output filters for high-efficiency power amplifiers (PAS). Filter systems presently employ either relays or… more
Abstract:Infection of plant roots by zoosporic pathogens in hydroponic vegetable culture is a recognizedmajor problem in the industry, reducing production and limiting growth of the industry.Hydroponic nutrient solutions provide ideal conditions for the rapid spread of zoosporicpathogens - continuously moist… more
Abstract:The ability to store and analyze a continuous sequence of high resolution images of a ballistic event has tremendous benefits in determining the ballistic limits for laminated carbon fiber materials. When the ability to store these images in a 3-D format is introduced, the volume of data that can… more
Rapid Tools for Joint Inversion and Imaging--Subterranean Research, Inc., P.O. Box 1121, Burlington, VT 05402-1121; (802) 658-8878
Dr. Donna M. Rizzo, Principal Investigator
Dr. David E. Dougherty, Business Official
DOE Grant No. DE-FG02-97ER82485
Numerous types of data are… more
Abstract:Turboshaft engines are subject to various transient modes, necessitating a compressor with very high surge margin. Therefore, many devices were proposed in the past, and some of them including a recent one with a vaneless cavity by Allied Signal Engines, demonstrated impressive surge margin… more
Abstract:The ability to reduce total coolant flows to meet increased cooling and life requirements in gas turbines is crucial to improving future aircraft propulsion capability. Existing compressor core cooling (CCC) techniques concentrate on rotor and casing thermal deflection matching during… more
Abstract:The ultimate Virtual Environment system must free the user of const raining hardwire connections to the host computer or telepresence sensors. In addition to wirelessness, the headset must be unobtrusive and deliver a high quality image. We propose a research methodology and development… more
Abstract:The Stable Master Oscillator (STAMO) which is insensitive to shock and vibration utilizes a unique optical resonator. The resonator cavity is not affected by the jitter of the associated electronics or temperature variations. The concept utilizes off-the-shelf, high reliability components readily… more
Abstract:Delays in language acquisition are the most prevalent developmental problem in preschool children.acquisition of verbs poses a special challenge for children with language problems; perhaps this isendowed with syntactic and semantic information and play a central role in the development of grammaWe… more
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