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 109 for “"Off-design"”.
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Characterization of Cooled Turbine Efficiency for Off-Design Performance Models
… 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 how they are represented in …
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The Off-Design Modelling of a Combined-Cycle Power Plant
… power plant in Flownex which can be solved in off-design conditions in order to compare it to plant data. The verification of this model will show that Flownex can be used to effectively and efficiently model a combined-cycle power plant. The process of development of the final Flownex model …
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Computational improvements to predict propeller performance at off design conditions
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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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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A Numerical Evaluation of Hypersonic Inward-Turning Inlets at Off-Design Conditions
… 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 Mach number (Mach 6 ± …
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Conical flow modeling for polygonal cross section bodies at off design conditions.
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1977
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An improved blade passage model for estimating off-design axial compressor performance
… of multistage axial compressor performance at off-design operating conditions are essential to the determination of key performance metrics of aircraft gas turbine engines, such as fuel burn, thrust output, and stable operating range. However, conventional RANS based CFD calculations of …
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The relationship between surface geometry and transonic intake performance during off-design climb
The design of slimmer, shorter gas-turbine nacelles supports lower emissions in civil aviation. However, these designs often have a stronger shock on the windward front-lip of the intake during off-design climb, producing a severe shock wave--boundary-layer interaction (SBLI) that greatly increases …
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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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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
… 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 conversation laws of hermodynamics, namely the conservation of energy and the conservation of …
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3-D flow and performance of a rocket pump inducer at design and off-design flow rates
… solver, The Moore Elliptic Flow Program. Design and off-design flow rates were simulated to qualitatively and quantitatively study the effects of flow rate on the flow and performance. Several views of the results were created to aid flow visualization. The 3-D laser measurements made by …
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Experimental and numerical investigations of the off-design flow physics in a supersonic through-flow fan cascade
The turbulent character of the supersonic wake of a linear cascade of fan airfoils has been studied experimentally using a two-component Laser Doppler Anemometer. The cascade was tested in the Virginia Polytechnic Institute and State University intermittent wind tunnel facility, where the …
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Effectiveness of a Serpentine Inlet Duct Flow Control Scheme at Design and Off-Design Simulated Flight Conditions
… technique were examined at cruise condition and off-design simulated flight conditions (angle of attack and asymmetric distortion). All of the experimental tests were run at an inlet throat Mach number of 0.55 and a resulting Reynolds number of 1.76*105 based on the hydraulic diameter at the …
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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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Comparative Energy Efficiency Analysis for Hydrogen and Jet Fuel in Next-Generation Long-Haul Aircraft
… no life-cycle CO₂ emissions. Liquid hydrogen offers the potential to provide zero in-flight CO₂ emissions and low life-cycle CO₂ if produced from non-fossil electricity. While wide-body aircraft account for approximately 43% of in-flight CO₂ emissions, few studies have focused on …
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Flow analysis and control in a subsonic inlet
… used on subsonic cruise missiles, as they offer a good compromise between compactness, low observability and aerodynamic performance. Though currently used S-ducts exhibit good performance in terms of distortion and pressure recovery at the AIP, the situation can degrade drastically when …
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Analysis and experiments for contra-rotating propeller
… efficiency. OPENPROP is an open source propeller design and analysis code that has been in development at MIT since 2007. This thesis adds another feature to the project with the off design analysis of a contra-rotating propeller set. Based on this code, the thesis offers a comparative analysis of …
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An Investigation into the impact of the spanwise flow field at rotor inlet on the performance of mixed flow turbines
… be capable of operating with high efficiency at off-design conditions, as well as possessing a low rotational inertia. One potential method to achieve this is the use of mixed flow turbines. However, compared to conventional radial flow turbines, mixed flow turbines experience increased flow …
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