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Record 10 of 7575
A GAS TEMPERATURE PROFILE BY INFRARED EMISSION-ABSORPTION SPECTROSCOPY
Author and Affiliation:
Buchele, D. R.
Abstract: This computer program calculates the temperature profile of a flame or hot gas. Emphasis is on profiles found in jet engine or rocket engine exhaust streams containing water vapor or carbon dioxide as radiating gases. The temperature profile is assumed to be axisymmetric with a functional form controlled by two variable parameters. The parameters are calculated using measurements of gas radiation at two wavelengths in the infrared spectrum. Infrared emission and absorption measurements at two or more wavelengths provide a method of determining a gas temperature profile along a path through the gas by using a radiation source and receiver located outside the gas stream being measured. This permits simplified spectral scanning of a jet or rocket engine exhaust stream with the instrumentation outside the exhaust gas stream. This program provides an iterative-cyclic computation in which an initial assumed temperature profile is altered in shape until the computed emission and absorption agree, within specified limits, with the actual instrument measurements of emission and absorption. Temperature determination by experimental measurements of emission and absorption at two or more wavelengths is also provided by this program. Additionally, the program provides a technique for selecting the wavelengths to be used for determining the temperature profiles prior to the beginning of the experiment. By using this program feature, the experimenter has a higher probability of selecting wavelengths which will result in accurate temperature profile measurements. This program provides the user with a technique for determining whether this program will be sufficiently accurate for his particular application, as well as providing a means of finding the solution. The input to the program consists of four types of data: (1) computer program control constants, (2) measurements of gas radiance and transmittance at selected wavelengths, (3) tabulations from the literature of gas transmission parameters at selected wavelengths, and (4) independently determined or estimated profiles of partial pressures of the gas reaction products. The output consists of error figures for the temperature and partial pressure profiles in tabular form. This program is written in FORTRAN IV for execution on an UNIVAC 1100 series computer with a main memory requirement of 21K of 36 bit words. This program was developed in 1977.
Publication Date: Jan 01, 1994
Document ID:
19940002881
(Acquired Dec 28, 1995)
Accession Number: 94M10424
Subject Category: INORGANIC AND PHYSICAL CHEMISTRY
Report/Patent Number: LEW-13094
Document Type: Computer Program
Publisher Information: United States
Financial Sponsor: NASA Lewis Research Center
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: GAS ANALYSIS; GAS TEMPERATURE; RADIATION PYROMETERS; TEMPERATURE PROFILES
Other Descriptors: FORTRAN IV; UNIVAC 1100 SERIES
Miscellaneous Notes: Approximately 920 source statements
Availability Source: Other Sources
Availability Notes: Program $300.00
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