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Monday, October 12, 2020 | History

2 edition of The effect of Reynolds number on the flow field about a 70? cone found in the catalog.

The effect of Reynolds number on the flow field about a 70? cone

by Richard Alexander Bevernick

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  • 30 Currently reading

Published by California Institute of Technology .
Written in English

    Subjects:
  • Aeronautics

  • ID Numbers
    Open LibraryOL24780271M

      This work investigates the aerodynamics of a NACA airfoil at the chord-based Reynolds numbers (Re c) from × 10 3 to × 10 lift and drag coefficients, C L and C D, of the airfoil, along with the flow structure, were measured as the turbulent intensity T u of oncoming flow varies from % to %. The analysis of the present data and those in the literature unveils a total Cited by:   Flow across a row of identical square cylinders placed side-by-side has been found to show interesting flow patterns which have complex characteristics depending upon the spacing (s/d) between the cylinders and the Reynolds number (Re). The combined effects of cylinder spacing and Reynolds number on the flow across a row of cylinders are numerically studied for 30≤Re≤ and Cited by:

    U.S. Army Ballistic Research Laboratory: Effect of Magnus torque on the yaw damping of the mm TE46 shell /, The flow field about the muzzle of an M rifle /, Hot-wire measurements in a cylinder wake for low Reynolds number flow at Mach two /, also by Clarence W. Kitchens.   the reynolds number is proportional to the pipe diameter. so as the diameter goes up the reynolds number goes up as long as the other variables are held constant. But basically flow will become more turbulent as pipe diameter increases (edit)-don't listen to .

      Results from the present study show that the skin-friction coefficient decreases as the Reynolds number,Re h, increases in the following manner, C f,min=−Re h −1/2. The -1/2 power relationship deduced from the correlationC f,min h indicates laminar like behavior which is consistent with the findings of Adams et al. ().Cited by:   Flow patterns and aerodynamic characteristics behind three side-by-side square cylinders has been found depending upon the unequal gap spacing (g 1 = s 1 /d and g 2 = s 2 /d) between the three cylinders and the Reynolds number (Re) using the Lattice Boltzmann method. The effect of Reynolds numbers on the flow behind three cylinders are numerically studied for 75 ≤ Re ≤ and Cited by:


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The effect of Reynolds number on the flow field about a 70? cone by Richard Alexander Bevernick Download PDF EPUB FB2

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection The effect of Reynolds number on the flow field about a 70 degree cone.

This investigation has undertaken to measure the possible Reynolds number effects in the flow field about a 70° finite cone in a supersonic flow. The principal means of observing such effects was by static pressure measurements at the surface of the cone.

Results indicate that such effects do exist when the free stream Mach number is low enough to produce subsonic flow over the face of the Author: Richard Alexander Bevernick. Reynolds number effects on atomization and cyclic spray fluctuations under gasoline direct injection conditions the flow field shows a larger Reynolds number with a much higher turbulence level leading to a more homogeneous flow.

If the fuel temperature of n-decane is increased to 70 °C the average cone angle is very similar to the one Cited by: 6. Reynolds number. At the latter Reynolds number the width of the wake and C D were minimum. In the super- and transcritical flow states the boundary layer separations took place at about the apex of the cylinder.

In comparison to the subcritical and critical regimes all measured flow field properties reached intermediate steady plateaus in the File Size: 5MB.

Reynolds Number - the non-dimensional velocity - can be defined as the ratio. u = velocity based on the actual cross section area of the duct or pipe (m/s, ft/s) For a pipe or duct the characteristic length is the hydraulic diameter.

The Reynolds Number for the flow in a. A.P. Boss, in Treatise on Geochemistry, Hydrodynamic turbulence. Given the high Reynolds number (Re=LV/v, where L=characteristic length scale, V=characteristic velocity, and v=kinematic viscosity) of a protoplanetary disk, one might expect that a turbulent cascade of energy would occur and result in an effective turbulent viscosity, which might be sufficient to drive disk.

In physics and fluid mechanics, a boundary layer is the layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant.

In the Earth's atmosphere, the atmospheric boundary layer is the air layer near the ground affected by diurnal heat, moisture or momentum transfer to or from the surface.

On an aircraft wing the boundary layer is the part of the. x 10 6 Reynolds number ii) x 10 6 Reynolds number iii) x 10 6 Reynolds number Figure Surface pressure profile at pitching angle -6° at varying Reynolds number (flaps) Figure shows the measured pressure coefficient at angle 10°.

At low Reynolds, flow attaches to the wing and % of the. defined as the cube root of the Prandtl number. Reynolds Number Measurement The Reynolds number is based on the axial chord and the exit conditions: Re = C (pV)exit (3) A where C is the chord length, p is the fluid density, V is the fluid velocity, and µ is the dynamic viscosity, ( File Size: 7MB.

SummaryThe Reynolds-number effects on the performance of a single-stage compressor have been measured over the range × to × The tests were carried out in a variable-density return-circuit rig and the Reynolds number varied partly by fluid density and partly by Size: 1MB.

cylinder in the Reynolds number range of The author discussed the appearance of pronounced three-dimensionality in the flow field even when the geometry is nominally two-dimensional.

Recently, Saha et al.6 performed three-dimensional numerical simulation for flow past a square cylinder at low Reynolds by: 8. Real time correction for the Reynolds effect In order to meet highest accuracy requirements in low-Re applications, the Re number effect must be compensated.

The Re number is calculated as D VD VD m 4 Re (1) where V is the mean flow velocity, the fluid density, Ddenotes the internal diameter of the pipe, 2 /. laminar flow and turbulent flow where fluid moves in irregular and rotational paths.

The number that describes the transition between the velocities is a dimensionless ratio named the Reynolds number and defines a range for the validity of Darcy’s Law in turbulent flow. (Appendix B) Table 1 gives the ranges.

Reynolds NumberFile Size: KB. For Reynolds numbers of toa steady non-axisymmetric regime is found, also in agreement with previous work. To advance the basic understanding of this transition, a symmetry breaking mechanism is proposed based on a detailed analysis of the calculated flow field.

Unsteady flow is calculated at Reynolds numbers greater than The Cited by: Experiments on the flow past a circular cylinder at low Reynolds numbers By D.

TRITTON Cavendish Laboratory, Cambridge (Received 25 February ) Part I describes measurements of the drag on circular cylinders, made by ob- serving the bending of quartz fibres, in a stream with the Reynolds number range Cited by: Pressure distributions over a circular cone at high angles of attack were studied.

Moskovitz et al.8 measured pressures at three sections on the nose cone at the Reynolds number of × Fiddes9 gave measured pressures at one front section at the Reynolds number of Cited by: 7. The flow about a three-dimensional circular cylinder at Reynolds number and Mach number was studied using a standard Navier-Stokes formulation with and without the subgrid-scale modeling.

To assess the effects of the Reynolds number on the flow field and the resulting aerodynamic loading, numerical results were obtained for the same kinematics by Kang et al. [] for Re = 6 x3 xand 1 x In this Reynolds number range, the Reynolds number sensitivity to the qualitative flow structures is small.

For both the cases of one heated wall and four heated walls, the Nusselt number and friction factor increase with increasing dimensionless curvature ratio ( The effect of aspect ratio on the end-wall flow of the juncture-vortex system of a surface mounted wing was investigated.

Tests were conducted on a 45 × 45 cm cross section test section water. Richard Alexander Bevernick has written: 'The effect of Reynolds number on the flow field about a 70?

cone' -- subject(s): Aeronautics Asked in Top Speeds What is the Top speed of the kfx r?By surrounding a conductive liquid with a magnetic field, movement of the liquid creates a measureable signal proportional with flow velocity.

Coriolis Meters These meters use the Coriolis effect to measure mass flow rate directly. Other Meter Types Other devices that have applications in flow measurement include swirlmetersFile Size: 1MB.The Reynolds number has a very strong influence on the magnitude of the profile drag because both the pressure drag and the friction drag decrease with increasing Reynolds number (see Fig.

b). The dependence of the minimum drag coefficient cDmin on the Reynolds number [29] is plotted in Fig. for several four-digit NACA profiles.