An analytical investigation of the nitric oxide contamination levels in the test flow of the Langley Arc-Heated Scramjet Test Facility

Conference · · Virginia Journal of Science; (United States)

OSTI ID:5674281

Fischer, K E ^[1]

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1. NASA Langley Research Center, Hampton, VA (United States)

A finite rate chemical analysis has been made of the flow in the Langley Arc-Heated Scramjet Test Facility (AHSTF) to assess the levels of nitric oxide contamination in the test gas at several test conditions. Nitric oxide is produced when the facility air flow is heated to the high energy levels required to simulate hypersonic flight conditions for free-jet scramjet engine tests. The analysis was performed across the operating range of the AHSTF which includes simulated flight Mach numbers of 5.5, 6,7, and 8. This paper describes the analysis beginning with heat addition to the flow in the arc-heater, mixing of the heated air with unheated bypass air in a plenum chamber, and flow through the facility nozzles (either Mach 4.7 or 6) to the test section entrance. The nitric oxide levels deduced analytically are compared to earlier experimental measurements. A knowledge of the nitric oxide levels is essential to determine the effect on ground facility scramjet performance data and the projection of this data to flight conditions.

• OSTI ID: 5674281
• Report Number(s): CONF-9205376--
• Conference Information: Journal Name: Virginia Journal of Science; (United States) Journal Volume: 43:2
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR FLOW
AIR POLLUTION
CHALCOGENIDES
CHEMICAL ANALYSIS
ENGINES
FLUID FLOW
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
QUANTITATIVE CHEMICAL ANALYSIS
RAMJET ENGINES
TEST FACILITIES