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1002-20-Ik January 29* 195^ 3093

Seventh

Progress lieport

on

Fire Detection in Aircraft Engine Nacelles

by

C. 0. EcCamy and Wm. F. Roeser

Covering period 25 October 19 >3 to 25 January 195%

. - "A.;.-:,

for

Headquarters

bright Air Development Center

bright-Patterson Air Force Base

Dayton* Ohio

Project no. 52-660A45

WCLBM-3

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Fir© Detection in Aircraft imagine .lacelles

by

C. 5. MeCamy and Wm. F. Koeser

1

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Summary

faring the past quarter measurements were made of the rate

at which energy was radiated in various parts of the spectrum

from high velocity jet flames. Measurements were also made of

the rate of increase la the radiation as the rate of combustion

increased from the instant of ignition. Some measurements were

.made of the relative amounts of energy received from flames

with and without a heated background.

2. Measurements on High Velocity Jet Flames

A series of measurements have been made on high velocity

flames produced by a ram-jet type burner in which the fuel

and air could be premixed and preheated. Gasoline was the Tael

used. For one series of flames, both the fuel and air were

premixed and preheated and the fuel-air ratio was varied over

wide limits. For another series, only the air was preheated

and the fuel was Injected into the air stream just ahead of

the flame holder, ffe® maximum velocity of the burning gas

ranged from 670 to 2370 feet per second. Measurements were

mad© of the rate of energy radiated in selected wavelength

bands and the flicker frequency distribution.

3. Hot Background Studies

A series of measurements have been mad© of the relative

amounts of energy received from flames with and without a

heated background, A black body radiator was used as the background source and its temperature was varied fro a ?0

° to

1000° F.

h. date of Increase of Emission

The rate of Increase of energy emitted by gasoline and

hydraulic fluid flames was measured under different conditions.

The results of these experiments are being analysed a id

summarized for inclusion in the final report.

5# Financial Condition

Expenditures and commitments on this project;

April 25, 1952 through Sept. 30, 1953 025,632.36

Oct. 1, 1953 through Dec. 31, 1953 9.001.00

Total through December 31, 1953 -3/.C33.J&
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