Flow rates and pressure profiles for one to four axially alined Borda inlets
Abstract
Choked flow rate and pressure profile data were taken on sequential, axially alined inlets of the Borda type. The configurations consisted of two to four inlets spaced 0.8 and 30 diameters apart. At a spacing of 30 diameters the reduced flow rate appeared to follow the simple empirical relation G sub r/G sub r,1=N(b), where G sub r,1 is the reduced flow rate for a single inlet; N is the number of inlets; and b, which is weakly temperature dependent, is approximately 0.4. The relation is in reasonable agreement with an analysis of the Ninlet configuration. At a spacing of 30 diameters the pressure profiles dropped sharply at the entrance and partially recovered within each inlet somewhat independently of N. Jetting through the last Borda was common at low temperatures. At a spacing of 0.8 diameter fluid jetting was prevalent at low temperatures for each configuration studied and flow rates were the same as that for a single inlet.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 December 1984
 Bibcode:
 1984STIN...8514078H
 Keywords:

 Flow Velocity;
 Inlet Flow;
 Inlet Pressure;
 Intake Systems;
 Flow Characteristics;
 Jet Flow;
 Mathematical Models;
 Pressure Distribution;
 Temperature Dependence;
 Fluid Mechanics and Heat Transfer