Experimental Investigation on Infrared Radiation Characteristics of Two-Dimensional Convergent–Divergent Vectoring Nozzle

A number of experiments is performed to evaluate the infrared radiation characteristics of two-dimensional convergent–divergent (2-D/CD) vectoring nozzles with and without infrared suppression measures. Film cooling and low-emissivity coating, as two general infrared suppression measures, are adopted on the centerbody and divergent flaps of the nozzle. The wall temperature and infrared radiation characteristics are measured, and the infrared suppression effectiveness of film cooling and the low-emissivity coating are obtained by analyzing the experimental results. The investigated results indicate that the infrared radiation of 2-D/CD vectoring nozzle increases with the increase of the vectoring angle. The synthetic infrared suppression of film cooling and the low-emissivity coating enable a remarkable decrease of the infrared radiation of 2-D/CD vectoring nozzles, and the synthetic infrared suppression measure adopted on different components has different suppression effects. For the cases studied in thi...