Atmospheric flow measurements using the PIV and HWA techniques

Pires, Luciana Bassi Marinho; Roballo, Suelen T.; Fisch, Gilberto; Avelar, Ana Cristina; Girardi, Roberto da Mota; Gielow, Ralf

doi:10.5028/jatm.2010.02027410

Abstract:

Alcântara Space Center (ASC) is the Brazilian gate to the space where rockets of different sizes are launched. At ASC there is a relative topographical variation, coastal cliff, which modifies the atmospheric boundary layer characteristics and can cause interference for operations of rockets. In the present work, a simplified model (mock-up) was studied in a wind tunnel. A scale factor of 1:1000 was used and the atmospheric flow was measured using the hot wire anemometer (HWA) and particle image velocimetry (PIV) techniques. Using of HWA it was possible to calculate values of average wind speed and fluctuations in a set of points of the section of tests that representing the region of the ASC. Through these measures, other meteorological parameters that represent the atmospheric flow, such as the friction velocity (u_*), the roughness length (z₀) from the logarithmic profile and the alpha exponent (a) of the power law were calculated. With the use of the PIV´s technique, the streamlines and the vorticity fields were obtained and it was noticed that the vorticity generated downwind of the coastal cliff has a strong turbulence (vorticities around 2000 s^-1). A rectangular building (simulating the mobile integration tower) was inserted at the mock-up and the downwind turbulence was similar to the one generated by the coastal cliff.

Keywords:
Alcantara Space Center; Wind profile; Turbulent intensity; Vorticity; Stream lines

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REFERENCES

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» https://doi.org/10.1016/j.jweia.2005.10.001
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Publication Dates

Publication in this collection
May-Aug 2010

History

Received
08 June 2010
Accepted
26 July 2010

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] Abu-Mulawech, H.I., 2005, "Turbulent mixed convection flow over a forward-facing step - the effects of step heights". International Journal of Thermal Sciences, Vol. 44, No 2, pp. 155-162. doi: 10.1016/j.ijthermalsci.2004.08.001.
» https://doi.org/10.1016/j.ijthermalsci.2004.08.001

[2] Arya, S.P., 2001, "Introduction to micrometeorology", 2nd edition, Elsevier ISE, Maryland Heights, MO, USA, 420 p.

[3] Blessmann, J., 1973, "Simulação da estrutura do vento natural em um túnel de vento aerodinâmico", Ph.D. Thesis, Instituto de Aeronáutica e Espaço, São José dos Campos, SP, Brazil.

[4] Cao, S. and Tamura, T., 2006, "Experimental study on roughness effects on turbulent boundary layer flow over a two-dimensional steep hill". Journal of Wind Engineering and Industrial Aerodynamics, Vol. 94, No 1, pp. 1-19. doi: 10.1016/j.jweia.2005.10.001.
» https://doi.org/10.1016/j.jweia.2005.10.001

[5] Fisch, G., 1999, "Características do perfil vertical do vento no Centro de Lançamento de Foguetes de Alcântara (CLA)". Revista Brasileira de Meteorologia, Vol. 14, No 1, pp. 11-21.

[6] Jonhson, D.L., 2008, "Terrestrial environment (climatic) criteria guidelines for use in aerospace vehicle development. (NASA/TM-2008-215633)", NASA Marshall Space Flight Center, Huntsville, AL, 472 p.

[7] Kwon, K.J., Lee, J.Y., Sung, B., 2003, "PIV measurements on the boundary Layer Flow around Naro Space Center", In: Proceedings of the 5th International Symposium on Particle Image Velocimetry, Busan, Korea, pp. 22-24.

[8] Liu, H., 1990, "Wind engineering: a handbook for structural engineers", Prentice Hall, Upper Saddle River, NJ, USA, 224 p.

[9] Loredo-Souza, A.M, Schettini, E.B.C, Paluch, M.J., 2004, "Simulação da camada limite atmosférica em túnel de vento", In: Möler, S.M, Silvestrini, J., Anais da IV Escola de Primavera Transição e Turbulência, Vol. 4, Porto Alegre, Brazil, pp. 137-163.

[10] Magnago, R.O, Fisch, G., Moraes, O.L.L., 2010, "Análise Espectral do Vento no Centro de Lançamento de Alcântara (CLA)". Revista Brasileira de Meteorologia, Vol. 25, No 2, in press.

[11] Mavroidis, I., Griffiths, R.F., Hall, D.J., 2003, "Field and wind tunnel investigations of plume dispersion around single surface obstacles". Atmospheric Environment, Vol. 37, No 21, pp. 2903-2918. doi: 10.1016/S1352-2310(03)00300-5.
» https://doi.org/10.1016/S1352-2310(03)00300-5

[12] Novak, M.D., et al, 2000. "Wind tunnel and field measurements of turbulent flow in forests. Part I: Uniformly thinned stands". Boundary Layer Meteorology, Vol. 95, No 3, pp. 457-495.

[13] Pires, L.B.M., 2009, "Estudo da Camada Limite Interna desenvolvida em falésias com aplicação para o Centro de Lançamento de Alcântara", Ph.D. Thesis, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil, 165p, Available at: <http://urlib.net/sid.inpe.br/mtc-m18@80/2009/06.22.18.27>.
» http://urlib.net/sid.inpe.br/mtc-m18@80/2009/06.22.18.27

[14] Roballo, S.T., 2007, "Estudo do escoamento atmosférico no Centro de Lançamento de Alcântara (CLA) através de medidas de torre anemométrica e em túnel de vento. (INPE-14824-TDI/1264)", Master of Science dissertation, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil, 137 p, Available at: <http://urlib.net/sid.inpe.br/mtc-m17@80/2007/06.12.18.07>
» http://urlib.net/sid.inpe.br/mtc-m17@80/2007/06.12.18.07

[15] Roballo, S.T., Fisch, G., 2008, "Escoamento atmosférico no Centro de Lançamento de Alcântara (CLA): parte I - aspectos observacionais". Revista Brasileira de Meteorologia, Vol. 23, No 4, pp. 510-519.

[16] Santa Catarina, M.F., 1999, "Avaliação do escoamento no Centro de Lançamento de Foguetes de Alcântara: estudo em túnel de vento, Relatório Final de Atividades de Iniciação Cientifica". Instituto Tecnológico de Aeronáutica, São José dos Campos, SP, Brazil, 72 p.

[17] Thompson, R.S., 1993, "Building amplification factors for sources near buildings: a wind-tunnel study". Atmospheric Environment, Vol. 27, No 15, pp. 2313-2325.

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