Exploratory Development of Illuminating Flares - Phase II.

The results reported are an extension of the work reported for the Phase I program see AD-848 086. The mathematical flow model which was developed for plane two-dimensional illuminating flares dropping through the atmosphere and simulating face down burning has been extended to include a lip which simulates unburned case material on the side of the flare. Simulation of a flare burning upward and falling downward in air is also included. Numerical results are provided in field plots showing streamlines, velocity potential lines, constant velocity lines, and constant time lines for two-dimensional, incompressible flow. Also shown are flow patterns around bubbles representing separated flow at the lip. Surveys of temperature by means of thermocouples were made throughout plumes of flares for two magnesium particle sizes, three percentages of magnesium, and three diameters. The results are presented in contour plots of temperature in the plume and tables. Results of thermochemical calculations to supplement those obtained in Phase I are also presented. Studies of particle behavior in the plume as well as at the burning surface were made and an analysis of combustion of magnesium as it moves from the flare surface, through, and out of the plume is presented. Results are shown in the form of curves of particle velocity and concentration, stereophotographs of plumes, and photographs of burned particles. Author