Effects of Elevated Driver-Tube Temperature on the Extent of Quiet Flow in the Purdue Ludwieg Tube.

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Abstract:

Heated driver-tube air will be needed when the existing Mach-4 test section of the Purdue Quiet-flow Ludwieg tube is replaced with a Mach-6 test section. Thus, a system was developed to heat the air in the driver tube. The air was successfully heated without dramatic adverse effects on the quiet-flow performance. Measurements of the mean and fluctuating pressure were made with a Kulite pressure transducer about 10 cm downstream of the onset of uniform flow. Temperature measurements were made with thermocouples and a cold wire. In agreement with previous results, the cold-driver quiet Reynolds number was about 400,000. The quiet-length Reynolds number decreased with increasing driver-tube temperature, dropping to 380,000 at 90C and 340,000 at 140C. Thus, a nozzle wall that is colder than the gas moves transition forward on the nozzle wall. This trend agrees with Harveys 1975 observation that a heated nozzle wall delays transition. Problems with nozzle cleanliness were encountered during the heating there were also problems with maintaining a uniform driver-tube temperature due to heat transfer to the nozzle and to the unheated upstream section of the driver tube.

Author(s):
Munro, Scott E.
Author Organization(s):
PURDUE UNIV LAFAYETTE IN
Descriptive Note:
Interim rept. Jul 94-Jul 96,
Pagination:
0244

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
$F49620-94-1-0067, $F49620-94-1-0326
Monitor Series:
AFOSR
 Subject Terms
Joint Capability Areas:
JCA_4.6_Engineering; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support; JCA_4.6.1_General Engineering; JCA_6.3.3_Spectrum Management; JCA_1.2.7_Experimentation; JCA_5_Command and Control; JCA_6_Net Centric; JCA_5.3_Planning; JCA_6.1.3_Switching and Routing; JCA_1_Force Support; JCA_6.3_Net Management; JCA_6.1.1_Wired Transmission; JCA_6.1_Information Transport; JCA_4.3_Maintain; JCA_1.2_Force Preparation; JCA_1.2.5_Lessons Learned; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_3.2_Engagement; JCA_3_Force Application
Modernization Areas:
Hypersonics
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*SUPERSONIC FLOW, *BOUNDARY LAYER TRANSITION, HEAT TRANSFER, PRESSURE GRADIENTS, PRESSURE TRANSDUCERS, SIGNAL TO NOISE RATIO, AIR FLOW, TURBULENT BOUNDARY LAYER, PRESSURE MEASUREMENT, FLOW FIELDS, TEMPERATURE GRADIENTS, MACH NUMBER, FLOW NOISE, FREE STREAM, THERMOCOUPLES, REYNOLDS NUMBER, SUPERSONIC WIND TUNNELS, NOZZLE GAS FLOW, HOT WIRE ANEMOMETERS, BOUNDARY LAYER FLOW, LAMINAR BOUNDARY LAYER, THERMAL INSTABILITY
Field(s)/Group(s):
Fluid Mechanics
Report Date:
1996 Dec 01
Creation Date:
1996 Nov 13