欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    NASA NACA-RM-E52H15-1952 Pressure limits of flame propagation of pure hydrocarbon-air mixtures at reduced pressure《在对比压力下纯碳氢气体混合物火焰传播的压力限制》.pdf

    • 资源ID:836033       资源大小:595.53KB        全文页数:37页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    NASA NACA-RM-E52H15-1952 Pressure limits of flame propagation of pure hydrocarbon-air mixtures at reduced pressure《在对比压力下纯碳氢气体混合物火焰传播的压力限制》.pdf

    1、RESEARCH MEMORANDUM PRESSURE LIMITS OF FLAMl3 PROPAGATION OF PURE HYDROCARBON-AIR MIXTURES AT REDUCED PRESSURE By Adolph E. Spakowski Lewis Flight Propulsion Laboratory C leveland, Ohio NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS Provided by IHSNot for ResaleNo reproduction or networking permitted w

    2、ithout license from IHS-,-,-1x NACA RM E52H15 i. RESEARCH ME“ PRESSURE LIMITS aF FLAME PROPAGATION OF PURF, HYDROCARBON-AIR MEEUlBS AT mucm mssms By Adolph E. Spakowski SUMMARY The flammability however, the apparatus and the conditions of the experiments are so-varied that correlations are extremely

    3、 difficult. Coward and Jones compiled the.greater part of these data into a single N publication (refere.= 7) . . An attempt was made at this laboratory to select an apparatus and a set of conditio percent by volume Ra f lamuability range, percent-by volume W molecular weight Subscrip-ks : e experim

    4、ental - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM E52EU5 Apparatus 3 N m cn 4 In this investigation the tube method of determining pressure- f-bility limits was selected. The specific agparatus employed, a modification of that used in r

    5、eference 4, is illustrated in ffgure 1. The fuel metering, mixing, and storing apparatus consisted of a 45-liter galvanized-steel storage tank with sealed stirrer A, fuel capsule B, air inlet H, and precision mmeter C. These components were .mounted within a glass-walled tank containing ethylene gly

    6、col, which served as a constant-temperature bath. The bath temperature was thermostatically controlled at preset temgeratures from 50 to llOo C - +0.5O C. The test section consisted of a closed glass tube 1.85 inches inside diameter and 48 inches long, joined by a spherical glass joint to the igniti

    7、on section. The flasre t for the three others, from NACA . L .i! Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM E52H3.5 5 . I N 4 investigations. The average change of the lean limit, expressed as volume percent fuel in the mixture, for the

    8、temperature range involved (25 - 80 C) was less than 0.001 percent per OC. The average change of the rich limit, expressed as volume percent fuel in the mixture, over the same merature rapge was 0.004 percent per OC. These tenperatwe corrections were applied to the data for the ensuing discussions.

    9、The tenperatwe of the fuel-air mixture in many cases was different from that of the flame ttibe, which necessitated an investigation of the time required for the gas to assume the flame-tuke temperature. For the merature differences involved, it was found that the gas required a maximum of several s

    10、econds to assume the flame-tube temperature. When the lean limit, expressed as volume percent of fuel in the mixture, is plotted against the nuniber of cazbon atoms in the molecule, it decreases quite regularly as the nWer of carbon atoms increases . (fig. 3). The precedFng relation holds true for t

    11、he n-a-es and the - n-alkenes. The curves at the top of figure 3 show thz effect of carbon content on the rich lFmft. Here again the limit decreases regularly as the nwIiber of carbon atoms increases. Since the rich flaamnability is a decrease of flammability range aa carbon content increases. 5. li

    12、mit is decreasing more rapidly than the lean limit, the over-all effect - The flammability 1-t of the fuel in the mixture, expressed now as the percent stichiometricis plotted against the moleculm weight in figure 4. For the n-alkanes the lean limit increases slightly to limit increases to n-hexene

    13、aqd Then decreases to n-decene. The rich limit for the n-arn-nes increases very rapidly from methane to n-heptane and then decreases sharply to n-decane. hitting ethylene, the-first meniber of the series, the n-aEene rich limit increases from propylene to n-hexene, then levels oFf through n-decene.

    14、From the curves presented in zhis figure it is seen that the moiecular yeight affects the rich limit to a larger exbent than it affects the lean 1-t. - n-pentane and then zecreases to n-decane; for the n-alkenes the lean The flanrmability rasge, that is the rich limit minus the lean limit, expressed

    15、 as volume percent fuel in the mixture, is plotted against the molecular weight in figure 5. All the hydrocarbons studied, plus those of reference 4, are included in this plot. The two coounds that deviate considerably are methane and ethylene. Also included in the plot are five gasoline samples. Be

    16、cause of the fair degree of correla- tion sham in figure 5 between the flammbility range and the molecular weight, an expression approxFnustely relating the two properties may be written as follows: Ra = aW b Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I

    17、HS-,-,-6 NACA RM E52H15 The constants in equation (1) were evaluated, and the resulting equation R,143w -0 - 70 w respectively; and then decreased to ;-decane Gd g?decene, respectively. The rich limit for n-albanes increased rapidly tu n-heptane and then decreased to :-decane. For the n-alkenes, the

    18、 rich lhd-t increased.rapidly to n-hexene and then remained-substantially constant through n-decene. - - 4. The flarrrmabflity range, when expressed as volm percent fuel in the mixture, was found to correlate with the molecular weight raised to the -0.70 power. This relation was evaluated for 8Ll of

    19、 the hydrocarbons studied and for several fuels with good agreement. 5. The rich limit was found tu correlate with the lean limit raised to the 0.56 power. The predicted values for the rich limit from this relation agreed well with those experimentally obtained. 6. The correlation between the lean l

    20、imit and the net molar heat of combustion was found to hold for the n-alkane and n-alkene series through the ten hydrocarbon members. It was Zso sham thgt the heat of cmbus- tion of the lean limit mixtures was substantially a constant. Lewis Flight Propulsim Laboratory National Advisory Committee fo

    21、r Aeronautics CleVehZldJ Ohio 1. Dugger, Goran L. : Effect of InitiaLMixture Temgerature on Flame Speed of Methane-Air, Propajle-Air, and Ethylene-Air Mixtures. NACA Rep. 1061, 1952. (Supersedes NACA TN 2374-r) 2. Dugger , Gordon L., and Grabb, Dorothy D. : Flame Speeds of 2,2,4- Trimethylpentme-Oxy

    22、gen-Nitrogen Mixtures. NMA TN 2680, 1952. 3. Metzler, Allen J. : Minimum Ignition Energies of Six Pure Bydrocarbon Fuels of the C2 and c6 Series. NACARM E52F27, 1952. 4. DiPiazza, James T. : Limits of Flammability of Pure Hydrocarbon-Air Mixtures at Reduced Pressures and Room Temperature. NACA RM E5

    23、1C28, 1951. 5. Spakowski, Adolph E., and Belles, Frank E. : Variation of Pressure Limits of Flame h-opagation with Tube Diameter for Various Isoocfpe- Oxygen-Nitrogen Mfxtures. NEA RM E52M8, 1952. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 6. B

    24、elles, Frank E., and Simon, Dorothy M. : Vmiation of the Pressure Limits of Flame Propagation with Tube Diameter for Propane-Air Mix- tures. NACA RM E51J09, 1951. 7. Coward, H F . , and Jones, G. W. : Limits of Flammability of Gases ad Vapors. Bull. 503, Biu:. Mines, -52. 8. Egerton, Alfred, and Pow

    25、ling, J. : The Limits of Flame Propagation at Atmospheric Pressure. I. The influence of “Promoters.“ Bot. Roy. SOC. (London), ser. A, vol. 193, May 27, 1948, pp. 172-190. 9. Burgess, Maurice John, and Wheeler, Richard Vernon: The Lower Limit of inflammation of Mixtures of Paraffin mocarbons with Air

    26、. Jour. Chem. SOC. Trass. (London), vol. XCIX, pt. 11, 1911, pp. 2013-2030. 10. White, Albert Greville: Limits for the Propagation of Flame in Inflammable Gas-Air Mixtures. Pt. I. Mixtures of Air and One Gas at the Ordinary Temperature and Pressure. Jour. Chem. SOC. Trans. (London), vol. Cm, pt. 11,

    27、 1924, pp. 2387-2396. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10 Average for 31 hydrocarbonsa Gasoline Ab Gasoline b Gasoline C Gasoline D Gasoline E Average for 5 gasolines Actual deviation (Fuel, percent by volume 1 Deviation (percent) 0.

    28、6 16 -0.1 7 0.4 -2 -5 -0.15 -2 -8 0.19 3.4 &Except ethylene and methane. bReference 7, temperature effect unknown. TABLE I1 - EVALUA!I?ION OF THE ExpaESSION R = 7.1 Lo 56 Average for 32 hydrocarbons* Gasoline b Gasoline b Gasoline C Gasoline-D Gasoline. E Average for 5 gasoline6 Le 0.5 1.4 1.0 -1.1

    29、0.1 0.3 0.78 -%xcept ethylene. “ 0.0 0.5 -0.3 0.1 - 0.3 0.24 6.0 19.7 20.8 -14 -9 - 1.5 4.8 12.3 Ld “ 0.0 9.4 -4.2 1.5 4.6 3.9 “ .- . bReference 7, temperature effect unknown. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . . . . . . , . . . . .

    30、. . . . . . . . . . 1 . . . . . . . . “. . . I a L99Z I Storage tank Fuel capsule Precision nanometer Flame tube Pressure gage Ignition coil Resistance-wound furnace Dried& inlet 1.1 variac - - 110 v - Watt meter Fieme 1- - Aaparatue for determining fhmabiuty mt. . . . P F . . . . . . . Provided by

    31、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-0 80 160 2rbo 320 4 Fuel, percent atoichlcrmetric (a) =-Pentane and air. Flsme-t*e temperature, 28O C- Figufe 2- - Pressure-f-bility limits in closed flame tube. 0 c Provided by IHSNot for ResaleNo reproduction or

    32、networking permitted without license from IHS-,-,-aCA RM E52Hl.5 Q) N u1 4 Fuel, gercent stoichiometric (b) g-HeXene and air. Flame-tube teqperature, SOo C. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-14 NACA RM E52El5 Fuel, percent stoichiometri

    33、c (c) &-Heptane and sirl I FLanae-tee t-rgtv-e, 50 C I. Figure 2. - Continued. Pressure-f-bbiUty lindts in closed flame tube. . . . “. 1-11 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM E52Bl5 15 80 160 240 320 400 Fuel, percent etoichiom

    34、etric (a) ctane and air. Flame-tube temperature, Soo C. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-16 NACA HM E52Hl.5 Fuel, percent etolchimetric (e) E-lonane and air. Fume-tube temperature, 80 C. Provided by IHSNot for ResaleNo reproduction or

    35、networking permitted without license from IHS-,-,-360 320 280 240 160 40 Fuel, percent stoichiometric (f) E-Decane and ab. Flame-tube tenperatme, 8oo C. Figure 2. - Continued. Pressure-flammablllty limits in cloaed flame tube. 17 Provided by IHSNot for ResaleNo reproduction or networking permitted w

    36、ithout license from IHS-,-,-4 18 NACA RM E52Hl.5 0 160 240 . 320 400 Fuel, percent etoichicrmetric (g) g-Hexene and air. Fb-tube temperature, 50 C. Figure 2. - Continued. Preesure-fLslrPoabllty limits in &sed flame tribe. Provided by IHSNot for ResaleNo reproduction or networking permitted without l

    37、icense from IHS-,-,-I IWCA RM E52El5 0 00 160 240 320 4 Fuel, percent stoichimetric . (h) l-0ctene and alr. Flame-tube temperature, 80u C. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-20 NACA RM E52Hl5 Fuel, percent stoichiometric (i) 1-Decene and

    38、 alr. Flame-tube temgerature, 8 C. Figure 2. - Continued. Preeeure-flammbility UlaitS in cloaed flame tribe. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM E52Hl5 21 . Fuel, percent stoichla+ric (J) Benzene and air. Flame-tube temperature, S

    39、Oa C. Figure 2. - Continued. heesure-flammabil.ity Limit6 in closed flame tube. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-22 NACA 3RM E52Hl.S 360 320 280 240 120 40 0 3 “97 00 160 240 , 320 44 Fuel, percent atoichiametric (k) Toluene and ah-. F

    40、lame-tube tempsatme, 50 C. Figure 2. - Continued. Pressure-flanrmrabilty limits in closed flame tube. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM E52ECL5 23 3 Fuel, percent stoichiometric (1) E-Xylene and air. Flame-tube temperature, 80

    41、 C. Figure 2. - Continued. Pressure-flannnabilitybility llmits in closed flame tube. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-24 360 320 280 240 120 0 NACA RM E5ZEl5 80 160 z4.0 320 Fuel, percent 6tDlchiometric “ c . Provided by IHSNot for Res

    42、aleNo reproduction or networking permitted without license from IHS-,-,-4x i eo 0 cn 4 I . 25 80 160 240 320 4m 480 Fuel, percent stoichiometric Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-26 NACA RM E52Hl.5 Fuel, percent stoichimetric ( 0) Methy

    43、lcyclohexane and air. -tube temperature, 50 C. Xigure 2. - Continued. Preateaure-flnmmRhility llmita in cloaed flame tube. . . .m. N Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-27 . . . Provided by IHSNot for ResaleNo reproduction or networking

    44、 permitted without license from IHS-,-,-2% NACA RM E5ZKI.S Fuel, percent stolchiametric (q) Di-isopropgl and air. FLame-tme temperature, 500 C. FQurc 2. - Continued. Preeeure-flannuabillty UmLts in clceed flame tube. Provided by IHSNot for ResaleNo reproduction or networking permitted without licens

    45、e from IHS-,-,-NACA RM E52H15 29 N 0, 8 1 * U 0 160 240 320 I P I Fuel, percent stoichiometric (r) 2,2,4-R.imethyLpentane anB air. Flame-tube teqperature, 500 C. Figure 2. - Concluded. Pressure-flammability limits in claaed flame tube. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-


    注意事项

    本文(NASA NACA-RM-E52H15-1952 Pressure limits of flame propagation of pure hydrocarbon-air mixtures at reduced pressure《在对比压力下纯碳氢气体混合物火焰传播的压力限制》.pdf)为本站会员(testyield361)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开