Flow rate and pressure profiles for 1 to 4 axially alined orifice inlets
Abstract
Choked flow rate and pressure profile data were taken on sequential axially alined inlets of the orifice type, with an orifice lengthtodiameter ratio of 0.5. The configuration consisted of two to four inlets spaced at 0.66 and 32 orifice diameters apart. At a spacing of 32 diameters the reduced flow rate appeared to follow the simple powerlaw relation G(sub r)/G(sub r,1) = N (supb), where G(sub r,1) is the reduced flow rate for a single inlet, N is the number of inlets, and b, although temperature dependent, is approximately 0.4. At this spacing the instrumented orifices and spacers gave pressure profiles that dropped sharply at the entrance and partially recovered within each inlet, somewhat independent of N. At low inlet temperature jetting through the last orifice was common. At a spacing of 0.66 diameter fluid jetting through all N inlets was prevalent at low temperatures for each configuration studied, as indicated by the flat pressure profiles and flow rates that were nearlly identical to those for a single orifice inlet. A simplifying relation was developed between the friction loss parameters for flow through N sequential tubes and N sequential inlets. The predicted flow rates for N tubes were in reasonable agreement with the N inlet analysis and followed the simple powerlaw relation.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 May 1985
 Bibcode:
 1985STIN...8527165H
 Keywords:

 Flow Velocity;
 Inlet Flow;
 Orifice Flow;
 Orifices;
 Pressure Distribution;
 Diameters;
 Flow Equations;
 Friction Factor;
 Inlet Temperature;
 Spacing;
 Temperature Effects;
 Fluid Mechanics and Heat Transfer