1002-20 -1*706

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January 25, 1953 2233

Third

Progress Report

on

FXEB DETECTION II AIRCRAFT ROOISL MACEL&h.;

by

0. S. McG amy and Wm. F. looser

Covering period 25 October, 1952 to 25 January, 1953

y: •?' y ,

for

Headquarters

Wright Air Development tenter

Wright-Patterson Air Force base

hayton, Ohio

Project Ko • 52-660A45

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Fire Detection in

Aircraft Engine Nacelles

by

G. S. McGamy and Wm. F. Roeser

1. Summary

Work on tiie construction of a spectroradiometer to be used

in analyzing the radiation from flames has been delayed because

of late delivery of some of the essential components* These

have been delivered recently and are now being tested and calibrated*

Some study is being made of the technical feasibility of

the development of fire detection systems in which the change

in the permeability of a ferromagnetic material at the Gurie

temperature is utilized. Several preliminary experiments, using

Ferromagnetic Ceramics as the cores of inductance c-oils, indicate that these materials might be used to advantage in a "spot”

fire detection system.

2. Radiation from Flames

Work is continuing on the construction of a spectroradiometer

to be used in analyzing the emissions from flames. Some delay has

been involved in procuring suitable filters and radiation detectors for the instrument but these have now been received. The

various components are being tested and calibrated.

The spectral region below G.29u is of special interest since

practically no radiation of these wavelengths is found in the

emissions from hot engine parts or in the sunlight reaching the

earth* s surface. The instrument referred to above employs photomultiplier tubes and a photo conductive cell for studying this

spectral region as well as others. A flame detector operating on

radiation of these wavelengths is expected to have little

'’background noise” or interference. In view of the fact that the

use of Gei ger-Muller tubes has been proposed for this specific purpose, such a tube has been obtained and plans are being made to

study some of the problems inherent in its application to fire

detection. Factors to be considered would be: transmittance of

oil films, stability of the counter tube, quenching characteristic

of the tube, and the size, weight, and maintenance requirements of

accessory equipment.
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Combustion studies were mad© to determine the type of flame

that might be expected in an aircraft engine nacelle as the result of burning aircraft hydraulic fluid or lubricating oil. the

observations Indicate that such flames are almost certain to be

luminous flames typical of open gasoline fires or very rich fuel*

air mixtures, The characteristic yellow color persisted in the

diffusion flames even when they were subjected to high velocity

air streams almost sufficient to extinguish them.

3 . Curie temperature Fir© Detection Systems

While the work on the study of flame characteristics was

being delayed by procurement difficulties , some study was made

of the technical feasibility of the development of fire- detection systems in which the change in -the permeability of a

ferromagnetic material at the Curie temperature is utilised.

Particular attention was directed toward the us© of Ferromagnetic

deraml.es because it is reported that these materials undergo a

much sharper change in permeability at the Curie temperature than

do metals.

Several preliminary experiments , using ferromagnetic Ceramics

as the cores of inductance coils, indicate that these materials

might be used to advantage in a

n spot” fir© detection system,

however, little is known regarding the degree to which these

materials ©an. be reproduced with specified magnetic properties.

Further experiments with these materials are planned.

Li-. Financial Condition

Expenditures and commitment© on this project?

April 25 through S^tember Jd, 19$2

October 1 through December 31 , 1952

Total through December 31 , 1952

| 6 , 968.82

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10 , 733 . 3?
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