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Thursday, July 30, 2020 | History

4 edition of Cavity unsteady-pressure measurements at subsonic and transonic speeds found in the catalog.

Cavity unsteady-pressure measurements at subsonic and transonic speeds

Cavity unsteady-pressure measurements at subsonic and transonic speeds

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Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, Springfield, VA .
Written in English


Edition Notes

Other titlesCavity unsteady pressure measurements at subsonic and transonic speeds.
StatementMaureen B. Tracy and E.B. Plentovich.
SeriesNASA technical paper -- 3669.
ContributionsPlentovich, Elizabeth B., Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17591846M
OCLC/WorldCa42677336

As a second example of validating the code, three configurations of cavity (L/D=, , ) were used to simulate quasi-periodic flow patterns at a Reynolds number of × The sound generated from turbulent flows around the yawed cylinder and in the cavity was .   Detached-Eddy Simulations (DES) of flows over clean and controlled cavities with and without doors are presented in this paper. Mach and Reynolds numbers (based on cavity length) were and one million respectively. Spectral analyses showed that the DES computations were able to correctly predict the frequencies of the Rossiter modes for both uncontrolled and controlled cases.

the off-design subsonic and transonic flight phases. Of the few exceptions, measurements of base pressure at transonic speeds on one aircraft configuration 4 have yielded data which are unrepresen- tative and which would in many cases be optimistic if used to . The development of the unsteady pressure field on the floor of a rectangular cavity was studied at Mach using high-frequency pressure-sensitive paint. Power spectral amplitudes at each cavity resonance exhibit a spatial distribution with a streamwise-oscillatory pattern; additional maxima and minima appear as the mode number is increased.

An experimental study was conducted in a m by m wind-tunnel to analyze effects of boundary-layer thickness on unsteady flow characteristics inside a rectangular open cavity at subsonic and transonic speeds. The sound pressure level (SPL) distributions at the centerline of the cavity floor and Sound pressure frequency spectrum (SPFS) characteristics on some measurement positions presented Author: Dang-Guo Yang, Jian-Qiang Li, Zhao-Lin Fan, Xin-Fu Luo. Subsonic and transonic calculations for this model have been made previously by several investigators using TSD codes and have been in generally good agreement with the experimental data. Calculations with CAP-TSD are compared with steady flow data for a0 = 0" and for Mach numbers of 0 in figure 7. Generally good agreement is demonstrated.


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Cavity unsteady-pressure measurements at subsonic and transonic speeds Download PDF EPUB FB2

NASA Technical Paper Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds Maureen B. Tracy and E. Plentovich December Get this from a library.

Cavity unsteady-pressure measurements at subsonic and transonic speeds. [Maureen B Tracy; Elizabeth B Plentovich; Langley Research Center.].

BibTeX @MISC{And_cavityunsteady-pressure, author = {Maureen Tracy And and Transonic Speeds and Maureen B. Tracy and Maureen B. Tracy and E. Plentovich and E. Plentovich}, title = {Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds}, year = {}}. determine cavity flow characteristics at subsonic and transonic speeds and in particular to determine the cavity length-to-depth ratios 1/h for the t)oundaries of the (tifferent cavity flow types.

A rectangular box cavity was tested in the Langley 8-Foot Transonic Pressure Tunnel File Size: 2MB. Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds.

By Maureen Tracy And, Maureen B. Tracy, Maureen B. Tracy and E. Plentovich and E. Plentovich. Abstract. this paper, which is a companion paper to one previously published on static-pressure results (NASA TP). Unsteady-pressure results indicate that, as l/.

Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds. By Maureen Tracy And, Transonic Speeds, this paper, which is a companion paper to one previously published on static-pressure results (NASA TP). Unsteady-pressure results indicate that, as l/ Topics: Symbols.

A rectangular box cavity in a flat plate was tested in the Langley 8-Foot Transonic Pressure Tunnel at Mach numbers from to at unit Reynolds numbers around 3 x 10(exp 6) per ft. Cavities were tested over length-to-depth ratios ranging from 1 to Cavity width-to-depth ratio was varied from 1 to The presented measurements were obtained using Rotor-1 from the TU Darmstadt rotor family.

With a sampling rate of kHz the pressure field is resolved with 23 measurements per passage (at rpm, design speed). [3] Rossiter J. E., “ Wind-Tunnel Experiments on the Flow over Rectangular Cavities at Subsonic and Transonic Speeds,” Aeronautical Research Council Rept.

London, Oct. Google Scholar [4] Tracy M. and Plentovich E. B., “ Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds,” NASA TP, Dec. Measurements of store forces and moments and cavity pressures for a generic store in and near a box cavity at subsonic and transonic speeds.

Hampton, Va.: Springfield, VA: National Aeronautics and Space Administration, Langley Research Center ; National Technical Information Service [distributor. Pressure measurements have been made in flight on two aircraft, VX and VX, the former at R.A.E. and the latter by Hawker Aircraft, Ltd.

A 1/7 scale model of tile aircraft less tail unit was made for test in the R.A.E. ft by 7-ft Subsonic Wind Tunnel, the primary object. [16] Tracy M.

and Plentovich E. B., “ Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds,” NASA TPDec. Google Scholar [17] Tracy M.

B., Plentovich E. B., Hemsch M. and Wilcox F. J., “ Effect of Sweep on Cavity Flow Fields at Subsonic and Transonic Speeds,” NASA TM, May Google Scholar.

Assessment of Passive Flow Control for Transonic Cavity Flow Using Detached-Eddy Simulation Most cavity experiments were based on unsteady pressure measurements in wind tunnels.

The works of Tracy et al. [8] and Tracy and Plentovich [9,10] from NASA Langley and Ross and but only for subsonic speeds. However, Shaw et al. [16] tested a. Cavity Unsteady-Pressure Measurements at Subsonic and Transonic Speeds Prediction and Measure-ment of Flow Over Cavities—A Survey AIAA Paper No.

Jan PAUL K. CHANG, in Separation of Flow, Analysis of base pressure of a bluff body at subsonic and transonic speeds. The theories of the base pressure at subsonic speeds have been developed by Kirchhoff [1] and von Karman [2].Kirchhoff's theory has already been mentioned in Chapter ning the drag, it may be said that Kirchhoff's theory considerably underestimates the drag.

The current work focused on a variety of recessed leading edge step arrangements. Configurations were tested at transonic Mach numbers spanning the range Mach –, and unsteady pressure measurements were recorded at various stations within the cavity in order to obtain acoustic spectra.

M. Tracy and E. Plentovich, â€" Cavity unsteady-pressure measurements at subsonic and transonic speeds. â€" Technical paper noNASA, december E. Kerschen and A. Tumin, â€" A theoretical model of cavity acoustic resonances based on edge scattering process.

â€" AIAA paper Comparison of Passive Flow Control Methods for a Cavity in Transonic Flow Article (PDF Available) in Journal of Aircraft April with Reads How we measure 'reads'. Tracy MB, Plentovich EB () Cavity unsteady-pressure measurements at subsonic and transonic speeds. NASA technical paperDecember Ukeiley LS, Murray NE () Velocity and surface pressure measurements in an open cavity.

rectangular cavity (L/D=5,W/D=1) at M= In the present study, this body of work is extended in three ways: first, from the transonic case to a range of flow speeds, from subsonic through to supersonic, M= to Secondly, comparison is made between three DES variants; two of which are frequently referenced in the literature, namely.

Effects of Boundary-Layer Thickness on Unsteady Flow Characteristics inside Open Cavities the length to depth ratio, L/D, is greater than 13 is called closed cavity flow, whereas the flow for the deep cavity, where L/D is smaller t is called open cavity flow, and where L/D is between 10 is called transitional cavity f   Tracy and E.

B. Plentovich, “ Cavity unsteady-pressure measurements at subsonic and transonic speeds,” NASA Technical Paper No. (). Google Scholar Wind tunnel tests to measure unsteady cavity flow pressure measurements can be expensive, lengthy, and tedious.

In this work, the feasibility of an active machine learning technique to design wind tunnel runs using proxy data is tested. The proposed active learning scheme used scattered data approximation in conjunction with uncertainty sampling (US).