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 44 for “"axial compressors"”.
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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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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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Active control of rotating stall in axial compressors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Active control of tip clearance flow in axial compressors
Control of compressor tip clearance flows is explored in a linear cascade using three types of fluidic actuators; Normal Synthetic Jet (NSJ; unsteady jet normal to the mean flow with zero net mass flux), Directed Synthetic Jet (DSJ; injection roughly aligned with the mean flow), and Steady Directed …
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Evaluation of rotating stall warning schemes for axial compressors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Small core axial compressors for high efficiency jet aircraft
… mechanisms that limit efficiency in small core axial compressors, defined here as compressor exit corrected flow between 1.5 and 3.0 lbm/s. The first part of the thesis describes why a small engine core with high overall pressure ratio (OPR) is desirable for an efficient aircraft and shows that …
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A Hybrid Vortex Solution for Radial Equilibrium in Axial Compressors
… equation for three dimensional design in axial compressors is generated. One of the most common used vortex solutions is Free Vortex. However, it ignores the fact that axial velocity varies with radius. The Hybrid Vortex includes axial velocity distribution with radius, which gives a more …
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Corrections to inter-blade-row flow measurements in axial compressors
For industrial multistage axial compressors, flow measurements in axial gaps between the blade rows are limited by mechanical constraints and the high uncertainty of the gathered data. The main factors affecting measurement uncertainties are the confined space between the blade rows, large relative …
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Reynolds number effects on the aerodynamics of compact axial compressors
An axial compressor for a domestic appliance can be designed to be smaller than an equivalent centrifugal compressor. However, the performance of such a compact axial compression system is limited by increased viscous losses and reduced flow turning at low Reynolds numbers ($Re$). In domestic …
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Actuation for rotating stall control of high speed axial compressors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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A Hybrid Vortex Solution for Surge Margin Enhancement in Axial Compressors
… with a hub-to-tip ratio of 0.4 and non-axial inlet flow. This vortex solution is proposed to overcome the rapidly approaching asymptotic peak in compressor performance in the industry today. The Hybrid Vortex theory incorporates a versatile, higher-order solution to the SREE, resulting …
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Large Tip Clearance Flows in High Pressure Stages of Axial Compressors
… is large. In the high pressure stages of axial compressors the tip clearance can be typically 6% of span and the total blockage due to tip clearance can consume in excess of forty percent of the annulus height. Experimental and computational investigations of large tip clearance in a …
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Tip clearance flows in axial compressors: stall inception and stability enhancement
The flow in the rotor tip clearance gap in an axial compressor influences the loss levels and the stall onset point. The role of tip clearance flows in the stall inception process is still debated, though. The aim of this thesis is to improve the fundamental understanding of the tip clearance flow …
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A simple criterion for three-dimensional flow separation in axial compressors
Most modem blade designs in axial-flow compressors diffuse the flow efficiently over 20% to 80% of blade span and it is the endwall regions that set the limits in compressor performance. This thesis addresses the estimation, control and mitigation of three-dimensional separation near the hub corner …
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