Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 194 for “"compressors"”.
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Flow in Multistage Transonic Compressors
Transonic compressors are regularly used as part of the compression system in industrial gas turbines because their high operating speeds make them capable of producing high stage pressure ratios and they have a high efficiency. The flow inside a these compressors is inherently unsteady due to …
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Three-dimensional separations in compressors
… to key flow and design parameters in axial compressors. Investigation into endwall flow control methods was undertaken, based on the understanding of the formation of 3D separation. These include clearance flows, endwall fences and endwall dividing streamline suction. The latter was …
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Inlet Recirculation in Radial Compressors
Deficient performances of turbocharger compressors inside turbo-charged engines limit the behaviour of the drive train. This problem has shifted the design space for compressors towards their performance at part-speed and low-flow conditions. The most dominant feature of these flow conditions is …
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Endwall blockage in axial compressors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Stall propagation in axial compressors
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1955.
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Secondary flow in axial compressors
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1954.
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Clearance management in twin screw compressors
Although the performance of twin screw compressors is heavily dependent on the rotor clearances within them, chamber models, used as design aids, allow for the specification of their magnitude and distribution but do not account for how these may vary during operation, as a result of internal …
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Tip-clearance effects in axial compressors
The flow in the tip-clearance gap of a compressor has a profound effect on its performance, but understanding of the actual flow phenomena involved is limited. The current work aims to improve the situation through a comprehensive set of tests on a compressor with different clearance sizes and …
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Unsteady Aerodynamics of Compact Axial Compressors
Compact axial compressors are of interest to the domestic appliance industry. The associated low Reynolds number leads to high losses compared to large-scale compressors due to a transitional flow field with large regions of separation. This thesis investigates how Reynolds number variations affect …
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Stalled flow characteristics for axial compressors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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Impeller-diffuser interaction in centrifugal compressors
… experimental observations made on centrifugal compressors. The success of a simple flow model in capturing the pressure rise trend indicated that although the changes in loss, blockage and slip were due largely to unsteadiness, the consequent impacts on performance were mainly onedimensional. …
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Design of supercritical carbon dioxide centrifugal compressors
Los potenciales problemas que puedan presentarse en el futuro asociados a la escasez de recursos energéticos convencionales (combustibles fósiles), han promovido desde hace décadas el desarrollo de sistemas renovables por un lado y por otro de sistemas de alta eficiencia. En este ámbito, los ciclos …
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Flow modelling of scroll compressors and expanders
The use of scroll compressors in refrigeration systems is becoming increasing popular. However the development and use of a scroll machine as an expander to replace a throttle valve has never been reported. This thesis describes the work carried out to develop a two phase scroll expander for use in …
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Design of an unloader for rotary compressors
The capacity of rolling piston type rotary compressors is typically varied by using variable speed motor drives. That entails the use of high cost electronics. This study explores an alternative means of achieving variable capacity while keeping motor speed constant, by lifting the vane …
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Non-intrusive fault detection in reciprocating compressors
… sensing and fault detection in reciprocating compressors driven by induction motors. The procedures developed here are "non-intrusive" because they rely only on electrical measurements to reconstruct the mechanical signals internal to the compressor. This allows for easy and non-intrusive …
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