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Showing 1 to 14 of 14 for “"flow quality"”.
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The measurement of wind tunnel flow quality at transonic speeds
The measurement of wind tunnel flow quality for the transonic flow regime has been plagued by the inability to interpret complex unsteady flow field information obtained in the free stream. Traditionally hot wire anemometry and fluctuating pressure techniques have been used to quantify the unsteady …
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Dynamic flow quality measurements in a transonic cryogenic wind tunnel
… for time-resolved measurements of dynamic flow quality in a transonic cryogenic wind tunnel. The first one is a dual hot-wire aspirating probe for measurement of stagnation pressure and temperature. The second is a miniature high-frequency response angle probe consisting of surface mounted …
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Optimization of Flow Quality In the Test Section of The 30-Inch x 40- Inch Subsonic Tunnel
<p>The purpose of this study is to optimize the flow quality inside the 30-inch x 40-inch subsonic wind tunnel. The tunnel is an open circuit with its inlet positioned adjacent to the side door of the lab; forcing the air to make a ninety degrees turn entering the tunnel. The flow suffered from two …
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Quasi-One-Dimensional Modeling of an Adiabatic-Compression Preheated Ludwieg Tube
… test times for investigating unsteady, transient flow effects while maintaining high flow quality due to the absence of vitiation contaminants and shocks in the generating flow. An electrically preheated Ludwieg tube provides the initial means of heating while the piston-compression is used to …
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Turbulence measurements and noise generation in a transonic cryogenic wind tunnel
… combination probe was used to measure dynamic flow quality in the test section of the NASA Langley 0.3-m Transonic Cryogenic Tunnel. The probe measures fluctuating stagnation (total) temperature and pressure, static pressure, and flow angles in two orthogonal planes. Simultaneous unsteady …
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Computational Assessment of Flow through a High-Flow Nacelle Bypass for Low Supersonic Boom
… to reduce sonic boom incorporates a high-flow secondary nacelle bypass to enclose the engine and its protrusions where the flow is diverted around a gearbox through a set of inlet and exit guide vanes. To assess the flow quality within the bypass, computational studies are conducted using …
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Optimization of modular die design in extrusion process
… severe plastic deformation as it is forced to flow through a smaller die cavity that defines the final shape of the extruding product. Surface finish and dimensional accuracy are the two most important criteria that specify the productivity and feasibility of the extrusion process which is …
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A methodology for the effective evaluation of the performance of wastewater systems
… are severe limitations associated with sewer flow quality models and their ability to represent the behaviour of pollutants within sewerage systems. While UPM appears to be the pinnacle of 10 years of research, a vast understanding still needs to be sought by scientists and engineers in …
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Production capacity utilization in the southern logging industry
… for a better understanding of stump to mill wood flow. Quality control statistical methods were adapted to analyze logging operations systems. Run charts, control charts, and cusum charts were used to measure variability in systems' production. Variation in production levels appear to be …
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Active Flow Control of Subsonic Flow in an Adverse Pressure Gradient Using Synthetic Jets and Passive Micro Flow Control Devices
… shown the advantages of active and/or passive flow control devices for boundary layer flow modification. Many current and future proposed air vehicles have very short or offset diffusers in order to save vehicle weight and create more optimal vehicle/engine integration. Such short coupled …
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Effectiveness of a Serpentine Inlet Duct Flow Control Scheme at Design and Off-Design Simulated Flight Conditions
… a static ground test facility to determine the flow quality of a serpentine inlet duct incorporating active flow control for several simulated flight conditions. The total pressure distortion at the aerodynamic interface plane (AIP) was then used to predict the resulting stability for a …
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Studies of turbulent flows in continuous casting of steel with and without magnetic field
… without magnetic field to investigate turbulent flows in canonical as well as in the nozzle and mold geometries of the continuous casting process. The direct numerical simulations are first performed in channel, square and 2:1 aspect rectangular ducts to investigate the effect of magnetic field …
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On the Evaluation of Common Design Metrics for the Optimization of Non-Axisymmetric Endwall Contours for a 1-stage Turbine Rotor
… manufacturers. While the majority of axial flow turbomachines use cylindrically shaped endwalls between the blades on the hub or shroud, non-axisymmetric endwall contouring is a reasonably recent technique which relaxes this constraint, and allows the geometry of the endwalls to depart from …
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Active and hybrid flow control in S-ducts and diffusers
… by the author in the field of aerodynamic flow control. The objectives were to develop flow control actuators, investigate their mechanism, and study their application on different flow-fields. Two flow control actuators - a pneumatic and a plasma-based one - were developed. On an applied …