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8 results on '"distorted flow"'

1. Conceptual aero-structural design of a fan stage under distorted flow.

Author

Pokhrel, Manish, Sarojini, Darshan, and Mavris, Dimitri N

Subjects
CONCEPTUAL design, AERODYNAMIC load, STRUCTURAL design, BOUNDARY layer (Aerodynamics), TRANSONIC aerodynamics
Abstract

Rotor blades experience unsteady forces and aerodynamic losses when operating in a distorted inflow. The structural analysis of rotors under these conditions, therefore, is of prime importance during the early design phase. This work introduces a computationally efficient design framework that links the aerodynamic design and structural analysis of the rotor. Rotor structural analysis comprises computing dynamic stresses, the excitation frequencies, and resonance margins at various modes of vibration. A design space encapsulating fan stage design variables, aerodynamic performance, and rotor structural constraints is explored and optimized for maximum fan stage efficiency subject to aerodynamic and structural constraints. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Experimental investigation of the influence of spinner shape on fan performance in subsonic uniform and non-uniform flow

Author

Prabhu, Rahul Rakesh (author) and Prabhu, Rahul Rakesh (author)

Abstract

The aerospace industry is always trying to improve aircraft designs in an attempt to improve its performance and also make it clean and sustainable. Boundary layer Ingestion (BLI) is one of the concepts which has the potential to improve fuel and overall propulsive efficiency of an aircraft. The BLI configuration have the engines integrated with the fuselage. The previous research and studies done so far have shown that the inlet distortion, from the ingested boundary layer and the consequent flow non-uniformity has detrimental effects on the aerodynamic performance of the fans and compressors in an engine. This novel concept of BLI has a lot of potential to not only improve the overall propulsive efficiency of an aircraft engine, but also to address the sustainability goals that the aviation industry has, with regards to emissions and noise pollution. For this technology to be viable, the engine fans need to be able to operate reliably and efficiently in continuous distorted inflow conditions. The present thesis is an experimental investigation on how the spinner shape influences the performance of the fan operating with distorted inflow. The main objective is to understand how the flow field behaves and in turn affect the stability and performance of the fan in subsonic uniform and non-uniform flow conditions with different spinner shapes. Performance maps and noise data are obtained at different flow speeds and Particle Image Velocimetry (PIV) measurements are taken to understand how the flow behaves downstream and upstream of the fan. This helped in understanding the effects of the fan interactions with the flow, which in turn was used to understand and explain the influence of the spinner shape on fan performance. Not much research has been done on the influence of spinner shapes and very few have studied PIV downstream of the fan. So this thesis yields valuable results that will contribute to the research done by the scientific community in this field, Aerospace Engineering

Published
2021

5. An Analysis of Electromagnetic Flowmeters: A Numerical Study

Author

Beck, Kade J.

Subjects
Civil and Environmental Engineering, Large Electrodes, Magnetohydrodynamics, Electromagnetic Flowmeter, Distorted Flow, Multipoint, Arc Electrodes, Large-Eddy Simulation, Singlepoint, Accuracy
Abstract

As water scarcity increases, improved water management through better water measurement is of critical global significance. Today, the most common way to measure water in drinking water and wastewater systems is to use an electromagnetic (magnetic) flowmeter. A magnetic flowmeter has many components, and their accuracy can be compromised if not installed or calibrated correctly. The purpose of the present study was threefold. Each of the three components has been named to help the reader understand the context of the study without getting lost in the details. The Idealist. Using mathematical programs, the spacing of two types of magnetic flowmeter sensors was optimized and the performance of these sensors was numerically compared to the standard sensors in use today. The Egalitarian. Not all researchers who are interested in magnetic flowmeter analysis are trained to understand how they work. Thus, some researchers are limited in their abilities to identify improvements to water measurement practices. Consequently, an alternative magnetic flowmeter analysis method was compared to the traditional magnetic flowmeter analysis method and found good agreement, thereby enabling a new group of researchers to analyze magnetic flowmeters. The Capitalist. Computer models can be used to predict the flow of water through pipes. Some models match laboratory observations better than others but are more ex-pensive to use. This segment of research explored how sensitive magnetic flowmeters are to less expensive and more expensive models and found that they appear to exhibit some sensitivity to the choice of model.

Published
2021
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6. Proceedings of the 11th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering: 5 - 7 September 2018, Berlin, Germany

Author

Juling, Markus and Furuichi, Noriyuki

Subjects
Taylor-Couette flows, shear flow, flow field measurements, velocity field mapping, ultrasonic Doppler velocimetry, asymmetrical flow, distorted flow, echo intensity velocity field, time-of-flight, rheometry, ultrasound shift method, non-Newtonian, phased array technique, flow field measurement, newtonian viscosity, rheology, UDV, flow rate, transient flow, CFD, signal processing, hybrid ultrasonic flow meter, flow rate measurement
Abstract

The Proceedings are the collection of the extended abstracts of the 11th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering (ISUD 11). ISUD is the most important scientific symposium on ultrasonic Doppler methods. Its purpose is to bring together both specialists and newcomers to share their knowledge about ultrasonic Doppler methods and to present the numerous studies using such methods.

Published
2019
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8. Simulation of Distortion Generation in a Modern Serpentine Diffuser to Improve Experimental Effectiveness (Preprint)

Author

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/TURBINE ENGINE DIV/FAN AND COMPRESSOR BRANCH, Sanders, Darius D, List, Michael G, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/TURBINE ENGINE DIV/FAN AND COMPRESSOR BRANCH, Sanders, Darius D, and List, Michael G

Abstract

Modern serpentine diffusers create distorted flowfields which are ingested by embedded propulsion systems. Fundamental research into the generation and content of such distortion patterns is necessary to better understand inlet conditions for the engine. Simulation of the diffuser provided a number of insights for a complementary experimental program including particle image velocity (PIV) plane placement and seeding locations, necessary resolution of measurement, and expected operational range and conditions. Analysis of the results provided better definition of some experimental requirements and sensitivities for capturing multiple per-rev distortions. In comparing with preliminary experimental results, it was determined that diffuser flowfield simulations may require detached-eddy simulation (DES) or large-eddy simulation (LES) to properly capture flow feature position and the impact of the separation regions.

Published
2012

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