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Showing 1 to 20 of 33 for “"air-jet"”.
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Air jet vortex generators for wind turbines
Air jet vortex generators are a boundary layer control device and as such can effect a significant delay to the stall of an aerofoil. They can also reattach a separated flow, as long as the angle of attack is less than the air jets 'on' stall angle. A wind tunnel model was built and tested and then …
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Active Drag Reduction of Ground Vehicles Using Air-Jet Wheel Deflectors
… Conventional wheel defectors are compared to air-jet wheel defectors on wheel drag and overall drag reduction capabilities. Two parametric studies are conducted on the Fabijanic body at a Reynolds number of 1.6x105: a study on the variation of the size and location of a conventional wheel …
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Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet
… consisted of injecting a polymer powder into an air/propane flame where the powder was heated enough to soften it before it was projected on to a substrate to provide a protective coating. Intermediate goals towards the final goal were identified. This thesis was based on four papers with each …
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A study of the application of air-jet vortex generators to intake ducts
Many modem combat aircraft have S-bend intake ducts supplying air to the engine compressor. At high Mach number and/or extreme manoeuvre conditions such ducts can produce excessive flow distortions at the engine face due to flow separating at the first bend of the duct. It has been proposed that …
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Dispersion of water sprays in a transverse air jet and the aging of spray nozzles
… move at very high velocities and generate a bulk air flow around the fiber bundle. This induced air flow appears to be a determining factor in the dispersion of the spray into the fiber bundle. An experimental apparatus was built to measure the entrainment of the spray into a transverse air jet …
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Study Of Heat Transfer Characteristics Of Impinging Air Jet Using Pressure Andn Temperature Sensitive Luminescent Paint
… apply the technique for a fundamental study on jet impingement heat transfer. First, Uni-Coat TSP and Binary-FIB PSP purchased from ISSI Inc. are calibrated to high accuracy. The calibration uncertainty of TSP and PSP are found to be ±0.93 °C and ±0.12 psi over temperature and …
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Experimental study of the atomization process for viscous liquids by meniscus perturbation and micro air jet
… oscillating motion of a needle and a micro air jet. Highly viscous liquids, such as glycerin and acrylic paint were successfully printed with this printing method within the line width of 1 mm. High-speed imaging technique was used to observe the evolution and mechanical perturbation of a …
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An experimental investigation of the use of air jet vortex generators to control shock induced boundary layer separation
Air jet vortex generators were originally investigated by R.A. Wallis. Results showed that their effectiveness in delaying shock induced boundary layer separation was not as good as conventional vane type generators. Recent low speed wind tunnel tests carried out at City University indicated that …
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Numerical Simulations and Studies on Round Jet Impingement, Twin Jet Impingement and Helicopter Rotor Blades Ground Effect
… parts. The first part focused on single round jet impingement. The convention air jet impingement on ground surface was compared to air jet impingement on water surface in the range of Mach number from 0 to 0.3. Currently the studies on round jet impingement on water surface are very few. The …
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Characterization of Drug-Loaded Milled Extrudate Particles Produced by Hot Melt Extrusion Technology for Dry Powder Inhalers
… Eudragit RL PO (ERLPO) polymer. Ball milling and air-jet milling were utilized to have powder with a particle size range that is required for inhalation. Air-jet milled formulations shopromising particle size results compared to ball milled formulations. All solid-state characterization studies …
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Tool wear monitoring in turning using fused data sets of calibrated acoustic emission and vibration
… selected for studying in detail. These are an air jet and a pulsed laser; the former produces continuous-type AE and the latter burst type AE. Since the air jet source has a power spectrum resembling closely the AE produced from single-point machining and since it is readily available in a …
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Development of a Dry Powder Inhaler and Nebulised Nanoparticle-Based Formulations of Curcuminoids for the Potential Treatment of Lung Cancer. Development of Drug Delivery Formulations of Curcuminoids to the Lungs using Air Jet Milling and Sonocrystallisation Techniques for Dry Powder Inhaler Preparations; and Nanoemulsion and Microsuspension for Nebuliser Formulations
… curcuminoids particles without excipients using air jet mill and sonocrystallisation methods for DPI formulations. It is the first time; the aerodynamic parameters of curcumin, demethoxycurcumin and bisdemethoxycurcumin were measured individually using NGI. The size, shape, free surface energy, …
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Structural vibrations in acoustic fields
… a structure having similar characteristics to an aircraft fuselage. Calculations of the shell vibration and internal sound field are given.<br/><br/>A simplified mathematical model, related to the phasing of aircraft propellers, is used to show the effect on the internal sound field due to a phase …
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Development of a data reduction method for a high frequency angle probe
… the angle probe was placed in an open air jet with an exit Mach number of 0.42. Plots of the time-resolved measurements and the Fast Fourier Transform analysis were made for each test.
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Heat transfer from a spherical surface by jet impingement: an experimental study
… for the removal of heat from a sphere, via jet impingement by single and multiple jets was documented experimentally. Average heat transfer rates from a sphere maintained at constant temperature, by means of an internal electronic heater, and subjected to single or multiple jet impingements …
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Deposition of Newtonian Particles Entrained in a Turbulent Axisymmetric Free Jet
… particle entrainment and deposition in turbulent airflows. One area of research needing further attention has been the study of particles entrained in axisymmetric air jets. An experimental rig was designed and built to study entrainment properties and deposition of Newtonian particles, after …
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Research on late-robust combustion
… tests were done. The first consisted of using an air jet mounted in the intake port to generate charge motion at a spark-timing sweep from 20⁰ BTC to 200 ATC. Two jet orientations were tested with the intent of generating swirl and tumble. Also done over this spark-timing sweep, the second set of …
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Low Temperature Drying of Ultrafine Coal
… shearing in the presence of unsaturated air. Theoretical analysis of the thermodynamic properties of water indicates residual surface moisture should spontaneously evaporate under these conditions. This is contingent on the large surface area of these fine particles being adequately …
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Evaluating a multi-jet Impingement air heat exchanger design for PEBB 6000 using Solidworks Flow Simulation
… and high heat flux. This paper proposes an air heat exchanger design that combines a parallel plate-fin heat sink with air jet impingement onto its fins. Previous studies showed that jet impingement methods can yield heat transfer rates that are three times of those produced by conventional …
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Dynamic flow quality measurements in a transonic cryogenic wind tunnel
… also obtained in the unsteady wake shed from an airfoil oscillating at 5 Hz. The investigation revealed the presence of large stagnation pressure and temperature fluctuations in the settling chamber occurring at the blade passing frequency of the tunnel driving fan. The fluctuations in the test …
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