Effect of pressure level on afterburner-wall temperatures Page: 3 of 25
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intensify with increasing pressure level (see also ref. 2) prompted an
investigation in a full-scale afterburner. This investigation, which was
conducted at the NACA Lewis laboratory, is reported herein.
A turbojet engine was used as a gas generator for the afterburner.
The engine inlet was connected to the laboratory air system in order
that afterburner pressures considerably in excess of those attainable at
sea-level static conditions could be obtained.
Orginally the investigation was to be conducted in two phases. The
first phase consisted of a survey over the operating conditions of interes
in order to define areas where detail measurements of emissivity should
be made. Detail emissivity measurements were planned for the second phase
of work. Only the first phase of work was completed since the results
appeared largely negative. Data were obtained in order that the effect
of pressure level on wall temperature could be directly observed and
analyzed. Comparisons were made at a constant ratio of cooling airflow
to afterburner gas flow. For a constant ratio of airflow to gas flow,
the ratio of convective heat-transfer coefficients is essentially inde-
pendent of pressure level, according to accepted correlations of heat-
transfer data. Factors other than convective heat-transfer coefficients
that affected wall temperatures were then easily isolated.
The results were interpreted in terms of results obtained in other
investigations of luminous radiation from combustion flames (refs. 2 and
3). Afterburner-wall temperatures were obtained over a range of
afterburner-outlet pressures from about 3700 to 6500 pounds per square
foot absolute and an afterburner-outlet temperature of about 28400 F
General features. - Construction features of the afterburner are
shown in figure 1. The over-all length of the afterburner, exclusive of
the exhaust nozzle, was 94.5 inches and it tapered from an inside diameter
of 34.9 inches at the upstream end to 27.2 inches at the downstream end.
A two-ring V-gutter flameholder was attached to the diffuser inner cone
as shown in figure 2. The outer gutter was surrounded by a perforated
screech-prevention shield similar to those described in reference 4. The
screech shield was 10,0 inches long and extended 8.5 inches downstream of
the flameholder-gutter trailing edge. The nature of this investigation
made the use of an afterburner-wall inner-cooling liner (which has also
been used as a screech suppressor) undesirable. A cooling liner would
have prevented the control of some variables, such as cooling airflow,
that are important in the interpretation of the results of the
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Shillito, Thomas B. & Smolak, George R. Effect of pressure level on afterburner-wall temperatures, report, June 11, 1958; (digital.library.unt.edu/ark:/67531/metadc52844/m1/3/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.