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Tuesday, July 28, 2020 | History

2 edition of Inlet shape effects on the far-field sound of a model fan found in the catalog.

Inlet shape effects on the far-field sound of a model fan

Inlet shape effects on the far-field sound of a model fan

  • 343 Want to read
  • 30 Currently reading

Published by National Aeronautics and Space Administration in [Washington, D.C .
Written in English

    Subjects:
  • Airplanes, Military -- Turbofan engines -- Noise.,
  • Fans (Machinery) -- Performance.

  • Edition Notes

    StatementL.R. Clark ... [et al.].
    SeriesNASA TM -- 112838., NASA technical memorandum -- 112838.
    ContributionsClark, L. R., United States. National Aeronautics and Space Administration., AIAA/CEAS Aeroacoustics Conference (3rd : 1997 : Atlanta, GA)
    The Physical Object
    FormatMicroform
    Pagination11 p.
    Number of Pages11
    ID Numbers
    Open LibraryOL15503912M

    This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation. The flow field and sound field of trapezoidal rudder-wing under different rudder angles are numerically predicted by CFD LES theory, Lighthill acoustic analogy theory and vibro-acoustic theory. And characteristics of hydrodynamic noise including flow noise and vibroacoustics under hydrodynamic excitations are analyzed. Results show that: at the same speed, the Cited by: 1.

    Toggle navigation. Search for: Basic acoustic calculations. Book — 1 online resource. a dynamics model is learned that can faithfully propagate the compressed representations in time. coarsening techniques for the computation of low-cost unsteady adjoints to obtain sensitivities for aeroacoustic shape optimization. The effects of the coarsening techniques on the accuracy of the gradients are.

      The model is taking the flow into the nozzle, and then supplying it into an open space (0Pa, or 1atm). As the flow exits the nozzle at m/s (65m3/s divide 2m2 area), there is a big exit loss. If I do a hand calculation for a sudden expansion with a K factor of 1; **()square = Pa. Incorporation of Computational Fluid Dynamics into a Fluid Mechanics Curriculum. (pressure inlet, pressure outlet), incompressible flow (velocity inlet, outflow), compressible flow (mass flow inlet, pressure far-field), and special (inlet vent, outlet vent, intake fan, exhaust fan). The boundary location and shape should be selected such Cited by: 7.


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Inlet shape effects on the far-field sound of a model fan Download PDF EPUB FB2

Get this from a library. Inlet shape effects on the far-field sound of a model fan. [L R Clark; United States. National Aeronautics and Space Administration.;].

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Robert Dougherty currently works at the Department of Aeronautics and Astronautics, University of Washington Seattle, and OptiNav, Inc. Robert does research in. The far-field sound was shown in Sections and to be directly related to the wavenumber transform of the jump in surface pressure across the blade evaluated at the acoustic wavenumber.

The physical interpretation of this result is that only waves that propagate across the surface at the speed of sound will couple with the acoustic far.

Experimental/Numerical Study of Ducted-Fan Noise: Effect of Duct Inlet Shape Article in AIAA Journal 56(6) October with Reads How we measure 'reads'.

Broadband Fan Interaction Noise using Synthetic Inhomogeneous Non-stationary Turbulence. Refraction effects on far-field noise predictions and sources distribution of coplanar coaxial jet flows.

Validation of the Predicted Circumferential and Radial Mode Sound Power Levels in the Inlet and Exhaust Ducts of a Fan Ingesting Distorted Inflow. Detailed knowledge of jet plume development in the near-field (the first 10–15 nozzle exit diameters for a round jet) is important in aero-engine propulsion system design, e.g., for jet noise and plume infrared (IR) signature assessment.

Nozzle exit Mach numbers are often high subsonic but improperly expanded (e.g., shock-containing) plumes also occur; high Reynolds numbers Cited by: 5. NOISE FROM INDUSTRIAL PLANTS DECEM Prepared by L. GOODFRIEND ASSOCIATES under CONTRACT for the U.S. Environmental Protection Agency Office of Noise Abatement and Control Washington, D.C.

This report has been approved for general availability, The contents of this report reflect the views of- the. New ultra high bypass ratio architectures may significantly affect the fan tonal noise of future aircraft engines.

Indeed, such a noise source is supposed to be dominated by the interaction of fan-blade wakes with outlet guide vanes.

However, shorter nacelles in these engines are expected to trigger an important air-inlet distortion that can be responsible for new acoustic sources on the fan Cited by: 6. Ma, Y and Cui, J and Vadlamani, NR and Tucker, P () Effect of Fan on Inlet Distortion: Mixed-Fidelity Approach.

In: ISROMAC, to -- pp. Dai, Y and Tyacke, JC and Tucker, PG () Rib shape effects on heat transfer performance in internal cooling passages. In: UNSPECIFIED pp. With the increased running speed of trains, the aerodynamic noise of trains becomes increasingly obvious. Reducing aerodynamic noises has become one of keys to controlling the noise of high-speed trains.

This paper conducted a numerical simulation on the aerodynamic noise of head of the high-speed train. Firstly, this paper established a mathematical-physical model for the Cited by: 2. The speed of sound c (from Latin celeritas, "velocity") varies depending on the medium through which the sound waves is usually quoted in describing properties of substances (e.g.

see the article on sodium). In conventional use and in scientific literature sound velocity v is the same as sound speed velocity c or velocity of sound should not be confused with sound.

ABSTRACT: Bunces Pass is an unstructured tide-dominated inlet just north of the main entrance to Tampa Bay, Florida. The inlet has been stable for at least years, as the size, shape, and orientation have remained unchanged.

The morphological evolution of the Bunces Pass ebb-tidal delta is influenced by adjacent inlets. 12) outlet “a2 single inlet outlet m a2 inlet m^, inlet m^, double inlet acoustical model electrical analogue fig. acoustical models and electrical analogue of single and double inlet blowers - 40 - freouency (hi) fig.

one-third octaveband sound power spectra produced by the /8 inch diameter impeller at (a) rav./min. and. Fan-Stack Model and Nomenclature Employed for the Calculation of Air Flow Rate From the Fan Curve.

58 Assume the fan inlet flow to be axial, AP V = -fc. linear and A-weighted sound levels at the top of the fan exhaust stack and in front of the open louvered face of the tower are presented.

These equations were used to update an. The present study extends the Booij Â’s and the KirbyÂ’s model to the problem of interaction between water waves and inlet flows. Scope of Study The primary purpose of this study is to develop a numerical model for the prediction of wave.

The FW–H method can predict the far-field sound pressure, that is, the sound-monitoring points can be located anywhere outside the computational domain. With a venting pipe m tall, the monitoring points are set at intervals of 5 m in the axial (x) and radial (y) directions of the gas jet flow with the outlet of the venting pipe as the by: 4.

The far field is the space outside the near field, meaning that the far field begins at a point at least one wavelength distance from the noise source. Standard sound level meters (i.e., type I and type II) are reliable in this field, but the measurements are influenced by whether the noise is simply originating from a source (free field) or.

Axial Flow Fan and Compressor Aerodynamics. Fully Parametric High-Fidelity CFD Model for the Design Optimisation of the Cyclic Stagger Pattern of a Set of Fan Outlet Guide Vanes.

Far-Field Radiation of Aerodynamic Sound Sources in. Influence of Airfoil Shape and Incidence Angle on High-Frequency Gust Interaction Noise. Authors; Authors and affiliations We find that the influence of airfoil camber and incidence angle on the total far-field sound power is and Albers, L.“Sound Radiation from a High-Speed Axial-Flow Fan due to the Inlet Turbulence Author: E.

Kerschen, C. Tsai, M. Myers. Soranna F, Chow YC, Uzol O, Katz J (). The effects of inlet guide vane-wake impingement on the boundary layer and the near-wake of a rotor blade.

Journal of Turbomachinery. (4). Borazjani I, Sotiropoulos F, Malkiel E, Katz J (). On the role of copepod antennae in the production of hydrodynamic force during hopping.

Abstract. Aircraft industry is exposed to increasing public pressure aiming at a continuing reduction of aircraft noise levels. This is necessary to both compensate for the detrimental effect on noise of the expected increase in air traffic and improve the quality of living in residential areas around airports.Results: Under a constant far-field fluid velocity applied perpendicular to the single fibre, the fibril deformed and settled in the configuration shown in Figure 1a.

Solid node reactions of the single fibril, accelerating against the direction of fluid flow, are given in Figure Size: 35MB.