球型收敛调节片喷管红外特性数值研究

通过数值模拟的方法，研究了喉部宽高比、下俯和偏航矢量作动角等3个结构参数对球型收敛调节片喷管(SCFN)后半球红外辐射空间分布的影响规律。结果表明：①喉部宽高比的增大使得铅垂对称面内(zOx)的红外辐射得到很好的抑制，当二元喷管喉部宽高比达到3.5时，尾向0°方向的红外辐射强度相对于基准圆形喷口降低了17.6%，水平对称面(yOz)内部分探测角度则出现了红外辐射增强的现象；②喷管调节片下俯作动角在zOx对称面310°~350°范围以及偏航作动角在yOz对称面330°~350°范围，红外辐射强度呈现增强趋势，而在无矢量作动的对称面内，红外辐射强度则得到有效抑制。

Numerical Study on Infrared Radiation Characteristics of Spherical Convergent Flap Nozzles

Numerical simulations are conducted to analyze the effects of throat aspect ratio, geometric pitch and yaw vector angles on the infrared radiation characteristics of spherical convergent flap nozzles (SCFN)Results of the study indicate that: ① As the throat aspect ratio increases, the infrared radiation intensity in the vertical symmetry plane (zOx) decreasesWhen the throat aspect ratio is 3.5, the value along the 0° direction declines by 17.6% as compared with the round nozzleOn the other hand, increases of the infrared radiation intensity in the horizontal symmetry plane (yOz) are observed②The pitch vectoring causes the increase of infrared intensity along the direction 310°-350° in the zOxplane, and the yaw vectoring also causes the increase of infrared intensity along the direction 330°-350° in the yOzplaneThe infrared radiation intensities in the other symmetries are successfully suppressed.