A new technique for visualization P a new technique for visualizing the flow in water tunnel of combustors and mixers is proposed. The technique is based upon the use of a newly developed type of material - neutral-density, bi-liquid foams or "polyaphrons." These materials are small spherical globules of one liquid encapsulated in a thin film of another liquid. They do not dissolve break-up or coalesce when injected into water. They are easy to see and photograph in water, and they can also be dyed to a variety of intense colors. Preliminary testing has shown great potential improvements over all existing methods. The Phase I program involves a thorough trial application using a realistic combustor model at representative test conditions.
