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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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This paper discusses the initial fabrication of a single-stage MEMS Knudsen Compressor vacuum pump, provides performance criteria such as pumping speed, size, energy use and ultimate pressure and details vacuum pump applications in several MDL related in-situ instruments.
Two passive tip clearance control devices for stall margin improvement in a transonic compressor are compared in detail. The primary objective of the current study is to examine the overall performance in terms of stall margin increase and any associated performance penalties near design operation with axial casing grooves (ACGs)and circumferential casing grooves (CCGs). The underlying flow physics of these passive flow control devices are examined and compared to identify any relative advantages in the development of optimized casing treatment designs.
This paper presents the detailed design and optimization of a three-stage axial supercritical carbon dioxide (sCO2) compressor to support the advancement of sCO 2 power cycles, recognized for their efficiency and compactness in energy conversion. The three-stage design is a scaled model of the original nine-stage 100 MW design. The aerodynamic design and structural analysis were performed at the University of Cincinnati, and the results are presented. The first stage of the design has been meticulously manufactured and experimentally tested at University of Notre Dame Turbomachinery Laboratory. The design process starts with the preliminary design process, considering the required operating boundary conditions and geometrical constraints for full stage design. The design is then scaled down to 3-stage based on the power limitation. The definition for design parameters has been inspired from the EEE HPC design and tweaked to fit the sCO 2 operation. Axisymmetric analysis is performed next and the parametric geometry modeler -Tblade3 has been used to create 3D blade geometry from the results which can then be exported for the 3D CFD analysis and optimization. An efficiency of 89.85% is predicted for the final design at the design point.
Wire material /Inconel/ having high friction and low wear characteristics, reduces vibratory stress and prevents compressor blade failure.
Study made of noise radiation from rotor-stator interaction in axial-flow compressors. The collected data were reduced to the form of radiation patterns and frequency spectra. These data show how the radiation patterns are affected by the relative number of rotor blades and stator vanes.
Plane compressor or cascade characteristics with small-aspect blades
Boundary layer blowing techniques for high lift stator blades in axial flow compressors
Nacelle design for turbofan engine compressor noise suppression on Douglas DC-8 aircraft
Inlet guide vane spacing effects on compressor noise reduction in turbojet engines
Design and evaluation of stator blades for use in boundary layer bleed techniques in axial flow compressor
Friction and fretting wear tests on materials used as friction dampers to reduce vibrational stresses in compressor blades for turbine engines
Development of compressor, stator, and vane pivot seals for use in advanced air breathing engines
Inlet guide vane choking noise reduction in axial flow compressors
Overall performance tests in argon of six inch radial bladed centrifugal compressor
Saturn pulse frequency modulation telemetry data processed through predictor data compressor
Axial flow compressor design computer programs incorporating radial distribution of total pressure and flow path or axial velocity ratio
Floated shoe close running air seals for supersonic jet engine compressors, discussing axial and radial seals design
Transmission buffer overflow prevention in telemetry data compressors using adaptive queueing control system