Abstract
Ultraviolet radiation from hydrazine spacecraft thruster plumes interacting with ambient atomic oxygen is modeled forlow-Earth-orbit conditions. Two numerical techniquesthatemploy the direct simulation MonteCarlo method are applied for the e rst time to the modeling of space plume radiation transient and three-dimensional e ows. These efe cient procedures allow one to analyze the effect of atomic oxygen penetration of the thruster plume, which is a key factor in modeling raree ed space plume radiation. The overlay technique is used to model thetransiente owevolutionduringthee rstseveralsecondsaftermotorignition.Goodagreementbetweenmodeling and experiment are obtained before 1-s motor burn time. The sensitivity of the plume radiation to the molecular total collision model is analyzed using the overlay technique, and the radiation spatial distribution was found to be strongly dependent on the temperature exponent of the coefe cient of viscosity. Three-dimensional computations are conducted for different angles between the plume axis and the freestream directions, and the radiation maps forOH(A)andNH(A)arepresented.Signie cantdifferencebetween OH (A)andNH(A)radiatione eldsasafunction of the angle of attack is shown.
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