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 10 of 10 for “"surge margin"”.
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A Hybrid Vortex Solution for Surge Margin Enhancement in Axial Compressors
… hub, but has great potential for increasing the surge margin of a compressor. It also demonstrated an 11% increase in the mass flow operational range over that of the baseline blade during off-design conditions.</p>
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A Computational Study of Axial Compressor Rotor Casing Treatments and Stator Land Seals
… compressor performance improvement in terms of surge margin and efficiency, rotor casing treatments and stator land seals.ADPAC and Fluent CFD solvers were used in the analysis of circumferential groove casing treatments and two types of stator seals, one typical of a front stage stator and one …
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Rapid Technology Development for High-Speed Compressors and Fans
… of six rotor geometries, the pressure rise and surge margin erosion caused by the cutbacks are quantified. The results show that the surge margin loss is controlled by the extent of damage in the worst continuous cluster, whereas the pressure loss is controlled by the total amount of flow …
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Application of a design optimization strategy to multi-stage compressor matching
… efficiency at high speed can compromise the surge margin at low speed. In this thesis, a design optimization framework has been implemented to an industry-strength compressor-matching problem. The optimization framework combines a mean-line flow solver and a dynamic stability analysis of a …
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Determination of a Simplified High-Order Vortex Equation for Radial Equilibrium with CFD Verification
… Vortex Equation was utilized to increase the surge margin of up to 3.32% compared to a rotor designed using the free vortex method.</p>
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A novel design methodology for enhanced compressor performance based on a dynamic stability metric
… stability but yields an average improvement in surge margin of 2.6 points. The compressor design optimization based on ...
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Is the Weis-Fogh principle exploitable in turbomachines?
… of such machines together with an improved surge margin. In our experiment these amounted to 3 percent and 10 percent respectively, and we are encouraged to expect these figures to be relevant to real machines from our interpretation of some test data on large scale machines with low blade …
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Design of a Total Pressure Distortion Generator for Aircraft Engine Testing
… characteristics, including lowering the surge limit and creating High Cycle Fatigue incidents. In order to create a distorted flow with dynamic characteristics, a mechanism must be developed that when actuated, can change the distortion pattern and intensity with respect to time. This …
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Water ingestion in jet engines.
… resulting in little or no loss of compressor surge margin and large spray coverage resulting in significant loss. The pe1formance of the first compressor stage is c1itical in explaining these differences in behaviour. Theoretical studies were conducted with the aim of predicting the spatial …
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Dynamical system modeling of a micro gas turbine engine
… properties. This increases the possibility of surge, over-temperature and over-speed. This also implies a potentially complex control system. The surge margin at the design point is large, but accelerating directly from minimum speed to 100% speed still causes surge. Investigation of the sensor …