Measurement of the air density gradient in transonic flows by the schlieren - speckle photography technique

• Autorzy: Szwaba R.
• Konferencja: "Modelling of Multiphase Flows in Thermo-Chemical Systems. Advanced Measurement Techniques" / sympozjum [5th; September 2nd - 4th, 2005; Stawiska near Gdansk, Poland]
• Języki publikacji: EN

Abstrakty

EN

This paper presents the description of two non-intrusive optical measurement techniques, which based on refraction and deflection of light rays. These techniques are the Schlieren method and the speckle photography. Especially the latter one have been gain an interesting recently due to dynamic development of computer techniques and digital photography. One of the important parameters in speckle photography is the resolution of the CCD chip of the camera and available resolution reach 16 mln pixels nowadays. Using tliis measurement technique we can obtain the quantitative information of density gradient in the flow with the high spatial resolution. This feature cause that this measurement technique can be use for investigation in turbulent flow.

Słowa kluczowe

EN

density gradient; schlieren optics; spackle photography; transonic flows

PL

gęstość; optyka smugowa; fotografia; przepływ przydźwiękowy

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Turbulence : international journal
• Rocznik: 2005
• Tom: Vol. 11
• Strony: 45--53
• Opis fizyczny: Bibliogr. 4 poz.

Twórcy

autor

Szwaba R.

• Institute of Fluid-Flow Machinery of Polish Academy of Sciences, Fiszera 14, 80-952 Gdansk,

Bibliografia

• [1] Fomin N.A., Speckle Photography for Fluid Mechanics Measurements, Springer-Yerlag, Berlin/Heidelberg 1998.
• [2] Kihm K.D., Laser speckle photography technique applied for heat and mass transfer problems, Advances in Heat Transfer 1997, 30, 255-311.
• [3] Kim J.H., Investigation of heat transfer characteristic and flow reversal phenomena in naturally convecting parallel/converging vertical channel. Ph.D. Desertation, Department of Mechanical Ingeneering, Texas A&M University 1993.
• [4] Kihm K.D., Image blurring of test section boundary in a specklegram technique for temperature gradient measurement, Applied Optics 1992, 31, 5907-5910.