Accession Number : ADA475796


Title :   The Impact of Manifold-to-Orifice Turning Angle on Sharp-Edge Orifice Flow Characteristics in both Cavitation and Non-Cavitation Turbulent Flow Regimes (Preprint)


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE


Personal Author(s) : Nurick, W H ; Ohanian, T ; Talley, D G ; Strakey, P A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a475796.pdf


Report Date : Jun 2007


Pagination or Media Count : 21


Abstract : The approach taken was to analyze the results in a manner consistent with application by design engineers to new and existing applications, while providing some insight into the processes that are occurring. This paper deals with predicting the initiation of cavitation, cavitation impacts on Cc, and non-cavitation impacts on Cd from L/D of 5 sharp-edge orifices with both single angle and compound angle directional flow. The results show that in the cavitation regime, Cc is controlled by the cavitation number, where the data follows the power with Kcav, and inception of cavitation occurs at a Kcav of 1.8. In the non-cavitation regime Cd is controlled by Reynolds number, and the head loss coefficient, KL for all angles is a function of the manifold-to-orifice velocity ratio. Compound angle orifices Cc and KL were found to be influenced more by the initial turning angle than the orifice turning angle. In the non-cavitation regime for conditions where the cross velocity is 0 the data are consistent with the first order equation relating HL to the dynamic pressure where KL is constant, which is consistent with in-line orifices.


Descriptors :   *TURBULENT FLOW , *MANIFOLDS(ENGINES) , VELOCITY , FRICTION , SCHEMATIC DIAGRAMS , CAVITATION , REYNOLDS NUMBER , FLOW RATE , ANGLES


Subject Categories : Fluid Mechanics
      Reciprocating and Rotating Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE