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

Abstract

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.

Authors:
 [1]
  1. NASA Langley Research Center, Hampton, VA (United States)
OSTI Identifier:
5674281
Report Number(s):
CONF-9205376-
Journal ID: ISSN 0042-658X; CODEN: VJSCAI
Resource Type:
Conference
Journal Name:
Virginia Journal of Science; (United States)
Additional Journal Information:
Journal Volume: 43:2; Conference: 70. annual meeting of the Virginia Academy of Science, Richmond, VA (United States), 19-22 May 1992; Journal ID: ISSN 0042-658X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR FLOW; QUANTITATIVE CHEMICAL ANALYSIS; NITRIC OXIDE; AIR POLLUTION; RAMJET ENGINES; TEST FACILITIES; CHALCOGENIDES; CHEMICAL ANALYSIS; ENGINES; FLUID FLOW; GAS FLOW; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; POLLUTION; 540120* - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Fischer, K E. An analytical investigation of the nitric oxide contamination levels in the test flow of the Langley Arc-Heated Scramjet Test Facility. United States: N. p., Web.
Fischer, K E. An analytical investigation of the nitric oxide contamination levels in the test flow of the Langley Arc-Heated Scramjet Test Facility. United States.
Fischer, K E. . "An analytical investigation of the nitric oxide contamination levels in the test flow of the Langley Arc-Heated Scramjet Test Facility". United States.
@article{osti_5674281,
title = {An analytical investigation of the nitric oxide contamination levels in the test flow of the Langley Arc-Heated Scramjet Test Facility},
author = {Fischer, K E},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5674281}, journal = {Virginia Journal of Science; (United States)},
issn = {0042-658X},
number = ,
volume = 43:2,
place = {United States},
year = {},
month = {}
}

Conference:
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