THE THEORY OF UNMIXED GASES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600270725-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: September 19, 2011
• Sequence Number: 725
• Publication Date: January 3, 1950
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/09/19: CIA-RDP80-00809A000600270725-7
50X1-HUM
1
CLASSIFICATION CONFIDENTIAL '~, ,,,1f i~E 1
INFORMATION FROM
COUNTRY
SUBJECT
HOW
PUBLISHED
WHERE
PUBLISHED
DATE
PUBLISHED
CENTRAL INTELLIGENCE AGENCY
Scientific, - Flaw research
Monthly pezicxiical
Moscow
Oct 1949
CD NO.
DATE OF
INFORMATION ,949
DATE DIST.3 Jan 1950
NO. OF PAGES., 2
SUPPLEMENT TO
REPORT NO.
THIS IS UNEVALUATED INFORMATION
TMII POCUIIIDT CO.TAMN. i.l0..ATI.N AIROTI.I TM! .ATIOMAI. OIII.tl
0! MI U.ITIU SCOTT! 'OITMI. TMT .TAMIMO OF AI.IONAAI ACT SO
0. S. 0.. I I A.D !S M O...OI O. IY! TIC 1T!lI!1ION O. TMI .... LATIOO
OS ITS COMTIOTH IN AMT .A...T Tr 40T...11I0 .5030. I! Mso-
""M .Y LAO. !IPIOOUOTIO, :'CON I! IlONI.1TTT.
figeet]
This article discusses the reaction of fuel and oxygen accompanied by cm-
bustion products and heat, and considers the steady state with continuous supply
of reactants and removal of produgte. This state Is characterized by the fact
that fuel and oxygen, or air, are supplied separately, i.e., are not mixed pre-
liminarily. Therefore, for large values of the eoasetent describing the speed
of reaction of oxygen with fuel, the combustion does not exceed some definite
,intensity, this limit depending upon the speed of mixing of fuel and oxygen.
Combustion, itself, is noted to change substantially the concentration dis-
tribution in ccmparison with that of the same gases mixed without combustion.
The author accepts the long-established basic quantitative representation of the
flame surface as separating the region of oxygen, but no fuel (oxidizing region)
from the region of fuel but no oxygen (reduction region).
5urke and Schumann. calculated the form of the flame surface in the vary
special case of cwM.ustion in parallel concentric Seminar fbiro of fuel sad
oxygen or air. However, they did not consider in detail the phenomena occurirq
in the flame zone. Shwable work is more complete.
In his recently published work, completed In 1940 in leaingrad, Shvab con-
sidered In detail the problem of supply In a turbulent jet of flame, both for a
pure combustible gas and for a gas mixture with an insufficient quantity of air.
Shvab found relations among concentration of gas, oxygen and combustion products,
teaperature and gas velo-:ty. A number of Shvable results (in particular, the
constancy of the concentration of combustion products and temperature) for the
flame surface were included in this article for completeness of the exposition.
The iteteiled -.onsideretion of the zones ant kinetics of reaction is essen-
tielly new.
NAVY
AIR
77
CONFIDENTIAL
Sanitized Copy Approved for Release 2011/09/19: CIA-RDP80-00809A000600270725-7
DISTRIBUTION
 Release 2011/09/19: CIA-RDP80-00809A000600270725-7
This study the maximum possible i.ntenai:ies of combustion for
laminar flow. :bic maximum intahsity is limited by the insufficient eneed of
reaction, even xh,..~n the fuel and oxygen are oupplied at high apeed to the flame
gases were mixed in stoichiomotric proportion and the combustion reaction
are then considered in the simplest, schematicized case.
The calculations which follow permit one t" determine the possible limits
of intensities for the combustion of unmixed gases which is depentent upon the
limiting speed of chemical reaction. In order of magnitude, this limit is
?- mixtw The l~~tt fc
C1.ose to the ~ Om7ri7:' tlOdl apOeu of a o wiChiuo '~w_+~ w
helve to explain at least qualitatively the fact that, in the flow of a fast
jet from a pipe, the flame is generally located at a certain distance from
the discharge section of the pipe since the flame is disrupted at the outlet
where the mixing of the reacting components is moot intense.
The practical and important ease concerning the limits of intensitiea of
turbulent combustion of u.nnixel gases was not considered in the work because
of its complexity. This complexity is linked with the fact that the average
speed of reaction ?:annot be related to the average temperature under turbulent
conditions.
radiation or cooling surfaces in the fL me. The quantity of heat given off by
radiation cannot be dieregerled in the :eat balance of a laboratory burner.
These considerations are used to ;calculate the status of the flame surface
for the supply of any quantity of gas and air for any gas of low caloric value;
this calculation is based on, the assumption of high speeds of chemical reaction
at the flame surface (even for the combustion temperature), which in turn re-
duces the thickness of the reaction zone so that it may be considered as a
geometrical surface of null thickness.
A different picture follow for low speeds of reaction. By analogies with
other phenomena in combustion and explosion, apparently a decrease in reaction
speed (all other conditions being equal) will at first cause a certain quanti-
tative variation, namely an expansion of the reaction zone, and then after
attainment of a certain critical value the flame will be, extinguished, combus-
tion will become impossible and stop, and the old gas and air will merely mix
without reaction instead of burning. These critical conditions of extinction
diction with :+.:perimen In experiment, however, the condition specified in
the above conclusion is not fulfilled, eamelr, that so heat be lost from
of stoichiometri?c mixture of the given gases under constant pressire.
c.rabustion zoi,., can !+a mown to equal Identically the temperature of comouagion
END -
- 2 -
CONFIDENTIAL
"ITSA1
:;Ii1L
Sanitized Copy Approved for Release 2011/09/19: CIA-RDP80-00809A000600270725-7