The literature records a great many meas urements, using stationary flames on burners of the speed with which flame moves through combustible mixtures of gases. D espite th~ fact that the method itself seems reasonably simple, the results obtained by various invcstigato:s often are not in good agreement. One of the phases of a program of research on combustIOn has been a study of some of the r easons for the differences among recorded values of flame speed measured by the burner method. The primary objective of this task has been to develop the precautions t hat should be observed in applying t he method, rather than to e volve numerical values of flame speed . This paper describes progress that has been made since the apparatus was described originally in 1951, and presents val ues of flame speeds of methane-air mixtures obtained s ince then, together with comparisons of these val ues with those obtained by two flame theories.
There are presented in this supplement to NBS Monograph 27, "Bibliography of Temperature Measurement, January 1953 to June 1960" issued April 6, 1961, about 700 additional references to the field of temperature measurement. The period covered is from July 1960 to December 1962 with some earlier references which came to our attention. The arrangement of material is the same as in Monograph 27, and the journal abbreviations used are those employed in Chemical Abstracts. Sharevskaya, D. I., and P. G. Strelkov, Methods for calibrating against the practical temperature scale in the region of 10-90°K, Measurement Techniques No. 2, 110 (Feb.)-Shpiegelman, E. S., Utilization of aluminum for calibrating first-grade thermometers, Measurement TechniquesNo. 5,405 (Jan.).
The effect of small quantities of m ethyl bromide, up to 0.5 per. cent by volume, on the flame speed of methane-air mixtures has been C\etermmed. MaxImum flame sp ee.ds,. at given experimental cond ition s, are reduced proportlOnately to the amount of me thyl bromIde added Flame speeds of rich mixtures are reduced much more than are flame speeds. o.f lean mixtu~es . Reaction zone thickness of m ethane-air flames is increased by t l .Ie addltlon of m ethyl bromide and the t hickness increases with th e amount of meth yl bromIde.
A st udy of sa mpling of hoL co mbustion gases b y means of wate r-coo led probes o f i n Lc rn ed diam eter of 0.027 to 0.070 cm has been m acl e. E ffect of co ndiLio ns of s amp li n~ on conccntrat lOn s o f CO, CO" H " a ncl H 20 ,,"as Lhe primary interesL in Lhi s sL udv. The probe'S wcr c unabl e to q ueneh r eaction s eompletel .v ancl .wel ."e u nable to prese r ve the orig i nal compositio ll of t he gas, b u t sm all prob es wcr e more efi ectl ve than larger probes. Sampl e composiLion was unaffected by sa mplll1g. veloClt.v, exce pt t h at at the hi g her rates of sampli ng it appears t h at grad ien t s o f compO SILlO n and tc mperature ea used the effectiveness of qu enchil'" Lo decr ease. Pro be m ate r ial a nd co nfiguratio n had li ttle effect on s>, mplc composi tion.b
(Nove mb e r J 7, 1965) Th e effects of five ha logena ted h yd ruca rbon s on th e fl a me speed of me th ane have been s tudi ed. Bromi des a re more e ffective in reducing fl ame s peed s th a n a re c hlorid es and th e red uc tion in fl a me s peed is proportional to th e amoun t of inhibitor added .Key Word s: 1 : la me s pe e d, com bu s t ion . inhibit u r, ha loge na ted hydrocarbon, bromide, c hl or id e.
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