Infrared imaging - A validation technique for computational fluid dynamics codes used in STOVL applicationsThe need for a validation technique for computational fluid dynamics (CFD) codes in STOVL applications has led to research efforts to apply infrared thermal imaging techniques to visualize gaseous flow fields. Specifically, a heated, free-jet test facility was constructed. The gaseous flow field of the jet exhaust was characterized using an infrared imaging technique in the 2 to 5.6 micron wavelength band as well as conventional pitot tube and thermocouple methods. These infrared images are compared to computer-generated images using the equations of radiative exchange based on the temperature distribution in the jet exhaust measured with the thermocouple traverses. Temperature and velocity measurement techniques, infrared imaging, and the computer model of the infrared imaging technique are presented and discussed. From the study, it is concluded that infrared imaging techniques coupled with the radiative exchange equations applied to CFD models are a valid method to qualitatively verify CFD codes used in STOVL applications.
Document ID
19910036964
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hardman, R. R. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Mahan, J. R. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Smith, M. H. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Gelhausen, P. A. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Van Dalsem, W. R. (NASA Ames Research Center Moffett Field, CA, United States)