Abstract: After the weakness of Hottel's method for solving plume radiation is discussed, an integral differential equation and its numerical solution form of plume radiation transmission in a dissipative and emitting medium are derived. Transportation equations of solid angle in radiation geometry are also derived. Finally, a computative example of integrate infrared radiation in a typical direction and of spectral distribution of a jet aircraft plume with chemical reaction is given.

Key words: plume radiation, infrared radiation, radiation transmission