EVALUATION OF MACH NUMBER DISTRIBUTION AT THE TEST SECTION OF THE TTP TRANSONIC WIND TUNNEL |
|---|
| M. L. C. C. Reis, J. B. P. Falcão Filho, B. Goffert, L. F. G. Moraes |
- Abstract:
- The distribution of the Mach number at the test section of the Brazilian Pilot Transonic Wind Tunnel is under evaluation for the subsonic, transonic and low supersonic ranges. The measured parameters in these investigative tests are static and total pressure of the airflow, which are the input quantities for the isentropic equation used for the Mach number estimation, which is the output quantity. The measurement of static pressures at several stations of the test section is accomplished by positioning a pressure probe at the centreline and by distributing pressure taps along the superior and inferior walls. The total pressure is measured at two locations: at the stilling chamber of the circuit and at the tip of the probe. Data reduction includes the evaluation of the uncertainties associated with the measured quantities, as well as their propagation to the output quantity, employing the Monte Carlo method. Least squares fitting is applied to the experimental data in order to supply Mach number distribution as a function of longitudinal positions of the test section. The distribution at the centreline resulting from the tests is compared to Computational Fluid Dynamics simulation for the supersonic regime.
- Keywords:
- transonic wind tunnel, uncertainty in measurement, Monte Carlo method, Least squares fitting, CFD
- Download:
- IMEKO-WC-2012-TC7-O15.pdf
- DOI:
- -
- Event details
- Event name:
- XX IMEKO World Congress
- Title:
Metrology for Green Growth
- Place:
- Busan, REPUBLIC of KOREA
- Time:
- 09 September 2012 - 12 September 2012