Test Data AC1-01: Difference between revisions
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=='''Test Conditions'''== | =='''Test Conditions'''== | ||
Measurements have been performed on a range of free-stream Mach number, (empty) cavity depths, with and without doors at 90o open ([[TR-026-20.pdf]] reports on the latter only). If appropriate, during the duration of the QNET project, a matrix of alternative test conditions against which to benchmark CFD calculations will be provided. | Measurements have been performed on a range of free-stream Mach number, (empty) cavity depths, with and without doors at 90o open ([[Media:TR-026-20.pdf]] reports on the latter only). If appropriate, during the duration of the QNET project, a matrix of alternative test conditions against which to benchmark CFD calculations will be provided. | ||
The specific test case of interest is classed as a deep cavity (L/D = 5) without doors, with flow conditions as follows: | The specific test case of interest is classed as a deep cavity (L/D = 5) without doors, with flow conditions as follows: | ||
Revision as of 13:37, 1 September 2008
Aero-acoustic cavity
Application Challenge 1-01 © copyright ERCOFTAC 2004
Overview of Tests
The experimental conditions are described in Media:TR-026-20.pdf. The full range of tests covers a variety of free-stream Mach numbers between 0.4 and 1.35, and for two cavity configurations, so-called shallow and deep. We concentrate here on a single one of these, namely M=0.85 deep cavity.
Unsteady pressure measurements were recorded by 10 Kulite transducers along the centreline of the rig (which did not coincide with the centreline of the cavity itself), at a sampling rate of 6000Hz. The position of each transducer is given in Table 1.
Transducer Number
Distance X from leading edge of cavity
(mm)
1
25.4
2
76.2
3
127.0
4
177.8
5
228.6
6
279.4
7
330.2
8
381.0
9
431.8
10
482.6
Table 1. Kulite Transducer Positions
M219D085.dat for the 10 transducer locations are stored using a sampling frequency of 6000 per second, for a total duration of just over 3.4 seconds. The M219DRMS.dat at these locations are also presented.
There is no independent verification of the validity/accuracy of the experimental data.
Test Conditions
Measurements have been performed on a range of free-stream Mach number, (empty) cavity depths, with and without doors at 90o open (Media:TR-026-20.pdf reports on the latter only). If appropriate, during the duration of the QNET project, a matrix of alternative test conditions against which to benchmark CFD calculations will be provided.
The specific test case of interest is classed as a deep cavity (L/D = 5) without doors, with flow conditions as follows:
M = 0.85
Re = 6.84e6 (based on cavity length of 0.508m)
P0 = 99612.06 Pa
P = 62059.14 Pa
T0 = 305.06 K
Incidence = 0o
References
TR-026-20.pdf Henshaw M.J de C., “M219 Cavity case in Verification and Validation Data for Computational Unsteady Aerodynamics”, RTO-TR-26, AC/323(AVT)TP/19, October 2000 © copyright ERCOFTAC 2004
Contributors: Fred Mendonca; Richard Allen - Computational Dynamics Ltd
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