Laminar burning velocity of aqueous ethanol/RP-3 aviation kerosene mixed fuel
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摘要:
采用定容燃烧实验装置获得初始压力为0.1 MPa、初始温度为450 K、当量比为0.8～1.4工况下乙醇/RP-3航空煤油预混火焰和含水乙醇/RP-3航空煤油预混火焰的层流燃烧速度 (LBVs) ，并分析了乙醇掺混比、乙醇含水量、当量比等因素对混合燃料层流燃烧速度的影响。研究表明：随着乙醇掺混比的增加，乙醇/RP-3航空煤油混合燃料层流燃烧速度增大；当RP-3航空煤油中乙醇掺混比一定时，随着乙醇含水量的增加，含水乙醇/RP-3混合燃料层流燃烧速度减小。由燃烧反应动力学分析可知，混合燃料的层流燃烧速度受动力学、热力学等的综合影响。本研究所获实验数据能够为生物乙醇燃料在航空发动机中的应用提供理论基础和技术支持。
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关键词:
- 定容燃烧 /
- RP-3航空煤油 /
- 含水乙醇 /
- 层流燃烧速度 (LBV) /
- 燃烧反应动力学
Abstract:The laminar burning velocities (LBVs) of ethanol/RP-3 aviation kerosene and aqueous ethanol/RP-3 aviation kerosene premixed flames under the initial pressure of 0.1 MPa, initial temperature of 450 K and equivalence ratios of 0.8−1.4 were obtained by using a constant volume combustion experimental device, and the effects of ethanol blending ratio, volume fraction of water in ethanol and equivalence ratio on the LBV of the mixed fuel were analyzed. Results showed that the LBV of ethanol/RP-3 mixed fuel increased with the increase of ethanol blending ratio; when the ethanol blending ratio in RP-3 fuel was constant, the LBV of aqueous ethanol/RP-3 mixed fuel decreased with the increase of volume fraction of water in ethanol. From analysis of the combustion reaction kinetics, the LBV of the mixed fuel was affected by the combined effects of kinetics and thermodynamics. The experimental data obtained can provide a theoretical basis and technical support for the application of bio-ethanol fuel in aeroengine.
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图 3 乙醇/RP-3航空煤油混合燃料火焰发展特性图片（pini=0.1 MPa、Tini=450 K）
Figure 3. Flame propagation images of ethanol/RP-3 aviation kerosene mixed fuel （pini=0.1 MPa，Tini=450 K）
图 4 含水乙醇/RP-3航空煤油混合燃料火焰发展特性图片（pini=0.1 MPa、Tini=450 K）
Figure 4. Flame propagation images of aqueous ethanol/RP-3 aviation kerosene mixed fuel （pini=0.1 MPa，Tini=450 K）
图 5 火焰半径随时间的变化趋势（pini=0.1 MPa、Tini=450 K、ϕ=1.1）
Figure 5. Change of flame radius versus elapsing time （pini=0.1 MPa，Tini=450 K，ϕ=1.1）
图 6 火焰传播速度随火焰半径的变化趋势（pini=0.1 MPa、Tini=450 K、ϕ=1.1）
Figure 6. Change of stretched flame speed versus flame radius （pini=0.1 MPa，Tini=450 K，ϕ=1.1）
图 7 拉伸火焰传播速度随火焰拉伸率的变化趋势（pini=0.1 MPa、Tini=450 K、ϕ=1.1）
Figure 7. Change of stretched flame speed versus flame stretch rate （pini=0.1 MPa，Tini=450 K，ϕ=1.1）
图 8 层流燃烧速度随当量比的变化趋势（pini=0.1 MPa、Tini=450 K）
Figure 8. Change of LBV versus equivalent ratio(pini=0.1 MPa, Tini=450 K)
图 11 活性自由基的摩尔分数（pini=0.1 MPa、Tini=450 K）
Figure 11. Mole fraction of active radical （pini=0.1 MPa，Tini=450 K）
表 1 乙醇/RP-3混合燃料层流燃烧速度影响因素 （pini=0.1 MPa、Tini=450 K、
${\boldsymbol{\phi}}$ =1.1）Table 1. Factors affecting LBV of ethanol/RP-3 mixed fuel （pini=0.1 MPa，Tini=450 K,
${\boldsymbol{\phi}}$ =1.1）工况 λ/
10−3 （J/（m−1·K·s−1））ρu/
（kg/m3）cp/
（J/（kg−1·K））α/
（cm2/s）Le Ea/（J/mol） Ta/K Tad/K E0 32.6 0.8265 1117.87 0.3529 0.8234 214755 25829 2355 E10 32.6 0.8257 1118.50 0.3530 0.8237 212814 25595 2352 E20 32.6 0.8249 1119.13 0.3532 0.8240 210097 25268 2349 E30 32.6 0.8240 1119.92 0.3533 0.8244 208715 25102 2345 E40 32.6 0.8230 1120.76 0.3535 0.8248 206708 24861 2341 E50 32.6 0.8219 1121.64 0.3537 0.8252 205738 24744 2337 
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表 2 含水乙醇/RP-3混合燃料层流燃烧速度影响因素 （pini=0.1 MPa、Tini=450 K、
${\boldsymbol{\phi}}$ =1.1）Table 2. Factors affecting LBV of aqueous ethanol/RP-3 mixed fuel （pini=0.1 MPa，Tini=450 K,
${\boldsymbol{\phi}}$ =1.1）工况 λ/
10−3 （J/（m−1·K·s−1））ρu/
（kg/m3）cp/
（J/（kg−1·K））α/
（cm2/s）Le Ea/（J/mol） Ta/K Tad/K E20W0 32.6 0.8249 1119.21 0.3532 0.8240 210097 25268 2349 E20W10 32.6 0.8239 1120.63 0.3531 0.8239 210198 25281 2345 E20W20 32.65 0.8230 1122.10 0.3535 0.8248 210734 25345 2341 E20W30 32.65 0.8220 1123.61 0.3535 0.8247 211533 25441 2337
下载: 导出CSV
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