Volume 34 Issue 3
Mar.  2019
Turn off MathJax
Article Contents
Article Navigation >  Journal of Aerospace Power  > 2019  >  34(3): 576-583
Combustion characteristics of randomly distributed mesoscale droplets[J]. Journal of Aerospace Power, 2019, 34(3): 576-583. doi: 10.13224/j.cnki.jasp.2019.03.008
Citation: Combustion characteristics of randomly distributed mesoscale droplets[J]. Journal of Aerospace Power, 2019, 34(3): 576-583. doi: 10.13224/j.cnki.jasp.2019.03.008
shu

Combustion characteristics of randomly distributed mesoscale droplets

doi: 10.13224/j.cnki.jasp.2019.03.008
  • Received Date: 2018-05-28
  • Publish Date: 2019-03-28
    Abstract
  • The evaporation/combustion characteristics of randomly distributed droplets in spray combustion were studied numerically, the randomness of the droplet size, coordinate distribution and number density was considered in detail. The large eddy simulation was carried out by the one step general package reaction mechanism, while the resistance characteristics and evaporation rate of droplets with different number density at different inflow rates and ambient temperatures were analyzed, and the interaction between droplets was analyzed in combination with the combustion modes. The results show that the combustion modes of the droplets include three flame modes (fully-enveloped flame, partially-enveloped flame and wake flame) of a single droplet at the same time. The concentration of ethanol vapor on the surface of each droplet presents asymmetrical distribution, and the core region of the reaction deflects at an angle. In the strongly convective environment, the variation of average surface evaporation rate and resistance coefficient of evaporation/combustion droplets is similar to that of a single evaporation/combustion droplet, the strong interaction between droplets could accelerates the heat and mass transfer of evaporation/combustion of droplets.

     

    • FullText(HTML)
  • loading
    • References(19)
  • [1]
    SADIKI A,CHRIGUI M,JANICKA J,et al.Modeling and simulation of effects of turbulence on vaporization,mixing and combustion of liquid-fuel sprays［J］.Flow,Turbulence & Combustion,2005,75(1/2/3/4):105-130.
    [2]
    KUO K K,ACHARYA R.Applications of turbulent and multiphase combustion［M］.New Jersey:John Wiley & Sons Incorporation,2012.
    [3]
    PETERS N.Multiscale combustion and turbulence［J］.Proceedings of the Combustion Institute,2009,32(1):1-25.
    [4]
    PARISI V,GIACONAZZI E,BRUNO C.Analysis of small scale turbulence-combustion interaction for LES modeling［R］.AIAA 2005-1283,2005.
    [5]
    SHINJO J,UMEMURA A.Droplet/turbulence interaction and early flame kernel development in an autoigniting realistic dense spray［J］.Proceedings of the Combustion Institute,2013,34(2):1553-1560.
    [6]
    KOURMATZIS A,PHAM P X,MASRIi A R.Characterization of atomization and combustion in moderately dense turbulent spray flames［J］.Combustion & Flame,2015,162(4):978-996.
    [7]
    SABELNIKOV V,FUREBY C.LES combustion modeling for high Re flames using a multi-phase analogy［J］.Combustion & Flame,2013,160(1):83-96.
    [8]
    CASTANET G,MAQUA C,ORAIN M,et al.Investigation of heat and mass transfer between the two phases of an evaporating droplet stream using laser-induced fluorescence techniques:comparison with modeling［J］.International Journal of Heat & Mass Transfer,2007,50(17):3670-3683.
    [9]
    CHIU H H.Advances and challenges in droplet and spray combustion:Ⅰ toward a unified theory of droplet aerothermochemistry［J］.Progress in Energy & Combustion Science,2000,26(4):381-416.
    [10]
    BILGER R W.A mixture fraction framework for the theory and modeling of droplets and sprays［J］.Combustion & Flame,2011,158(2):191-202.
    [11]
    CHEN W,GAO R,SUN J,et al.Modeling of an isolated liquid hydrogen droplet evaporation and combustion［J］.Cryogenics,2018,96:151-158.
    [12]
    ZHOU L X,LI K.Analytical and numerical studies on a single-droplet evaporation and combustion under forced convection［J］.Acta Mechanica Sinica,2015,31(4):523-530.
    [13]
    李科.液雾-空气两相湍流燃烧的多尺度模拟［D］.北京:清华大学,2011.LI Ke.Multi-scale simulation of two-phase turbulent spray combustion［D］.Beijing:Tsinghua University,2011.(in Chinese)
    [14]
    周力行.两相燃烧的大模拟［J］.中国科学(技术科学),2014,44(1):41-49.ZHOU Lixing.Large-eddy simulation of two-phase combustion［J］.Scientia Sinica(Technologica),2014,44(1):41-49.(in Chinese)
    [15]
    ZENG Z X,ZHOU L X,QI H Y.Large eddy simulation of particle wake effect and RANS simulation of turbulence modulation in gas-particle flows［J］.Chinese Journal of Chemical Engineering,2007,15(1):12-16.
    [16]
    ZHOU L X.Studies on evaporation and combustion of single droplet and spray combustion［D］.Saint Petersburg,Russia:Saint Petersburg State Polytechnic University,1961.
    [17]
    SANYAL A M D.Modeling of evaporation and combustion of droplets in a spray using the unit cell approach:a review［J］.Heat Transfer Engineering,2012,33(4/5):375-386.
    [18]
    SEGAWA D,YOSHIDA M,NAKAYA S,et al.Autoignition and early flame behavior of a spherical cluster of 49 monodispersed droplets［J］.Proceedings of the Combustion Institute,2007,31(2):2149-2156.
    [19]
    周力行.燃烧理论和化学流体力学［M］.北京:科学出版社,1986.
    • Relative Articles
    • Supplements(0)
    • Cited By
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索
    Get Citation
    PDF(837.0KB)
    XML

    Article Metrics

    Article views (732) PDF downloads(496) Cited by()
    Proportional views
    Related

    Copyright © 《Journal of Aerospace Power》 All Rights Reserved.

    Supported by: Beijing Renhe Information Technology Co., Ltd.  

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return