Effects of Several Geometric Parameters on the Performance of a Multiple Nozzle Eductor System.

摘要

Cold flow tests of a four nozzle eductor system were conducted to evaluate the effects of certain geometric parameters on eductor performance. Eductor performance was related to non-dimensional parameters governing the flow phenomenon developed from a one-dimensional analysis of a simple eductor system based on conservation of momentum for an incompressible gas. An experimental correlation of these parameters was developed and used to determine the effects of several geometric parameters on eductor performance. The geometries tested consisted of: two mixing stack lengths, 2 and 3 mixing stack diameters long; varying the distance between the primary nozzle exit plane and the entrance to the mixing stack; and addition of a conical transition to the entrance of the constant cross section part of the mixing stack. Within the range of variables tested, the longer mixing stack with a distance between the primary nozzle exit plane and the entrance to the mixing stack of about 0.5 mixing stack diameters without an entrance transition gave the best overall performance. (Author)