Studies of injectors often utilize a single, isolated atomizer. In most applications, however, the atomizer is not isolated but is near one or more walls. It has been established that walls affect the expansion and stability of single-phase jets. Under study here is the effect of a single wall on spray behavior, specifically attachment length, spreading and stability. The atomizer being studied is a gas-centered swirl coaxial injector which relies on a dominant gas flow to drive the atomization. High-speed images are analyzed to assess the spray's behavior both qualitatively and quantitatively. Two different wall offset ratios, 0.83 and 1.16, are compared to the free spray. While both walls spacings affect the spray by reducing the spreading, only the 0.83 spacing shows an ability to stabilize the spray.
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