RESULTS OF AN EXPERIMENTAL INVESTIGATION OF THE PERFORMANCE OF AN EXPANSION TUBE
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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The results from an experimental study of an expansion tube conducted at the von Karman Gas Dynamics Facility VKF are presented and discussed. The research was conducted in two facilities 1 a 6.75-in.-diam Modified Expansion Tube MET which utilizes a partially steady and partially unsteady expansion process, and 2 a 4-in.-diam constant diameter High Density Shock Tube HDST operated in an expansion tube mode for a completely unsteady expansion of the shock-heated gas to the final test condition. Flow velocities from approximately 9000 to 16,000 ftsec were studied. The theoretical performance of expansion tubes in terms of velocity is found to be nearly obtained however, the steadiness of the resulting flow leaves much to be desired, and the definition of accurate flow conditions remains in serious doubt.
- Test Facilities, Equipment and Methods
- Fluid Mechanics