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Showing 1 to 16 of 16 for “"Off-design Performance"”.
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Characterization of Cooled Turbine Efficiency for Off-Design Performance Models
<p>Gas turbine performance modeling is essential for predicting engine behavior across design and off-design conditions. Yet the treatment of cooling or service flows remains inconsistent, as these streams interact with the main flow in complex ways and their contribution to turbine work depends on …
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Modelling, off-design performance and control analysis of OTEC power plants
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Ocean Engineering, 1981
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Non-uniform radial meanline method for off-design performance estimation of multistage axial compressors
… cannot meet demand [1], [21. This makes the off-design performance of such gas turbines more important as they spend more of their operational life off the design point. Currently off-design performance cannot be estimated with high fidelity until late in the gas turbine compressor design …
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Charge-sensitive methods for the off-design performance characterization of organic Rankine cycle (ORC) power systems
… including predictive control, optimal sizing or performance forecast - a proper understanding and characterization of the ORC behaviour under off-design conditions is of significant interest. In order to avoid any intrinsic state assumption, predictive models must account for both fundamental …
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Modelling and Optimization of Scalable Hydrogen Fuel Cell Systems for Aviation
… and optimization tool for the sizing and performance estimation of a fuel cell system operating in an aviation environment. The tool includes the drag from the thermal management system, optimal design of the compressor system considering the altitude, and a hydrogen storage system sizing …
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An Improved Streamline Curvature Approach for Off-Design Analysis of Transonic Compression Systems
… were implemented to ensure accurate and reliable off-design performance prediction. The assessment was made relative to the modeling of key transonic flow field phenomena, and provided the basis for improvements, central to which was the incorporation of a physics-based shock loss model. The new …
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A Numerical Evaluation of Hypersonic Inward-Turning Inlets at Off-Design Conditions
… of hypersonic, inward-turning inlets to performance losses at off-design conditions is explored. Axisymmetric, inward-turning inlets were designed for Mach 6, and the inlet performance was evaluated from computational fluid dynamics (CFD) simulations. These inlets were run at a range of …
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Development of a Multi Design Point Optimization Framework for Gas Turbine Cycles
… development and validation of an in-house engine performance modeling tool, CY23, as a foundation for multi-design point optimization of aero gas turbines. While the original intent was to construct a complete optimization framework, the primary contribution of this work lies in the creation, …
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Design Optimization of the First Stage Fan Blade of a Low Bypass Turbofan Engine
… set of conditions, while altering several design parameters, has been developed and applied. The conditions for which the analyses have been developed were designed for the use of, but not exclusively limited to the application of, military aircraft at altitude. The approach consists of …
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A Hybrid Vortex Solution for Radial Equilibrium in Axial Compressors
… equilibrium 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 …
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SIMULATION AND OPTIMIZATION OF COMBINED CYCLE GAS TURBINE POWER PLANTS
… turbine (CCGT) power plants normally run under off-design (namely part-load) conditions during their lifetime. Off-design operation decreases plant thermal efficiency and increases carbon emissions. Hence, there are strong incentives to study and improve CCGT performance under off-design …
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The influence of blade stacking on turbine losses
… as well as making matching easier and improving off-design performance. It seems that the details of the separation of the inlet endwall boundary layer and formation of the horseshoe vortex have a strong influence on the subsequent development of the secondary flow. Numerical calculations must …
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Using Single Propeller Performance Data to Predict Counter-Rotating Propeller Performance for a High Speed Autonomous Underwater Vehicle
… applications. Counter-rotating propellers offer higher peak efficiencies, better off-design performance, and roll control capabilities. But counter-rotating propeller matching is a difficult and complex procedure. Although much research has been done on the design of optimal …
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Thermofluid design and analysis of centrifugal compressors for a 50 MWe concentrated solar power supercritical CO₂ Brayton power cycle
… achievable with sCO₂. This study presents the design and simulation of three centrifugal compressors for a 50 MWe CSP sCO₂ Brayton power cycle. To accomplish this, a one-dimensional (1-D) mean line design methodology was developed for preliminary design and optimisation purposes. The …
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A Performance Study of a Super-cruise Engine with Isothermal Combustion inside the Turbine
… with afterburner. This study investigates the performance increase of a turbofan engine through the use of isothermal combustion inside the high-pressure turbine (High-Pressure Turburner, HPTB) as an alternative form of thrust augmentation. A cycle analysis computer program is developed for …
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Novel Inverse Airfoil Design Utilizing Parametric Equations
The engineering problem of airfoil design has been of great theoretical interest for almost a century and has led to hundreds of papers written and dozens of methods developed over the years. This interest stems from the practical implications of airfoil design. Airfoil selection significantly …