NASA Technical Reports Server (NTRS) 19780012188: Performance Of A Short Annular Dump Diffuser Using Suction-stabilized Vortices At Inlet Mach Numbers To 0.41 - Info and Reading Options
By NASA Technical Reports Server (NTRS)
"NASA Technical Reports Server (NTRS) 19780012188: Performance Of A Short Annular Dump Diffuser Using Suction-stabilized Vortices At Inlet Mach Numbers To 0.41" and the language of the book is English.
“NASA Technical Reports Server (NTRS) 19780012188: Performance Of A Short Annular Dump Diffuser Using Suction-stabilized Vortices At Inlet Mach Numbers To 0.41” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 19780012188: Performance Of A Short Annular Dump Diffuser Using Suction-stabilized Vortices At Inlet Mach Numbers To 0.41
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
Edition Identifiers:
- Internet Archive ID: NASA_NTRS_Archive_19780012188
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"NASA Technical Reports Server (NTRS) 19780012188: Performance Of A Short Annular Dump Diffuser Using Suction-stabilized Vortices At Inlet Mach Numbers To 0.41" Description:
The Internet Archive:
A short, annular dump diffuser was designed to use suction to establish stabilized vortices on both walls for improved flow expansion in the region of an abrupt area change. The diffuser was tested at near ambient inlet pressure and temperature. The overall diffuser area ratio was 4.0. The inlet height was 2.54 cm and the exit pitot-static rakes were located at a distance from the vortex fence equal to two or six times the inlet height. Performance data were taken at near ambient temperature and pressure for nominal inlet Mach numbers of 0.18 to 0.41 with suction rates of 0 to 18 percent of the total inlet airflow. The exit velocity profile could be shifted toward either wall by adjusting the inner- or outer-wall suction rate. Symmetrical exit velocity profiles were unstable, with a tendency to shift back to hub- or tip-weighted profile. Diffuser effectiveness was increased from about 47 percent without suction to over 85 percent at a total suction rate of about 14 percent. The diffuser total pressure losses at inlet Mach numbers of 0.18 and 0.41 decreased from 1.1 and 5.6 percent without suction to 0.48 and 5.2 percent at total suction rates of 14.4 and 5.6 percent, respectively.
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