Fluidic Gas Diverter Valves

摘要

A V/STOL configuration using turbojet exhaust for hovering and jet thrust for propulsion requires the use of high-capacity diverter valves. A study was conducted to investigate the application of fluidic principles to V/STOL diverter valve design. During the program, three subscale valves were built and tested. Each valve has two outputs, one feeding a simulated tail exhaust pipe and one exhausting directly to atmosphere. The operation of each valve depends upon the viscous interaction between a turbulent flow and a wall. The objective is to establish the flow diversion capabilities and jet mode thrust performance of each model. Flow tests were conducted using compressed air at flow rates ranging to 3000 cfm at 30 psi. The impulse delivered at the output of each valve was measured in terms of the developed thrust per unit mass flow over a range of supply pressures. Data representing the ratio between deliverable impulse and isentropic impulse are included to provide a means for comparing the designs. (Author)