Mass interminglement and hypergolic ignition of TMEDA and WFNA droplets by off-center collision

被引:14
作者
Zhang, Dawei [1 ]
He, Chengming [1 ]
Zhang, Peng [1 ]
Tang, Chenglong [2 ]
机构
[1] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon 999077, Hong Kong, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
关键词
Hypergolic ignition; TMEDA; WFNA; Droplet collision; Impact parameter; Volume-of-Fluid; LATTICE BOLTZMANN SIMULATION; UNEQUAL-SIZE DROPLETS; FUMING NITRIC-ACID; BINARY COLLISIONS; ADAPTIVE SOLVER; COALESCENCE; DYNAMICS; MONOMETHYLHYDRAZINE; ATOMIZATION; SEPARATION;
D O I
10.1016/j.combustflame.2018.08.002
中图分类号
O414.1 [热力学];
学科分类号
摘要
Binary collision between a smaller N, N, N', N'- tetramethylethylenediamine (TMEDA) droplet and a larger white fuming nitric acid (WFNA) droplet was investigated experimentally and computationally for understanding the influence of off-center collision on the hypergolic ignitability of the system, which is controlled by the mass interminglement and mixing subsequent to the droplet coalescence. The ignition delay time was experimentally found to non-monotonically vary with the impact parameter, which measures the degree of off-center collisions. This phenomenon was hypothetically attributed to the non-monotonicity of mass interminglement of colliding droplets with increasing the impact parameter-the increased droplet stretching by slightly off-center collision promotes mass interminglement, but the stretching separation by significantly off-center collision reduces mass interminglement. This hypothesis was computationally verified by a validated volume-of-fluid (VOF) simulation of a simplified problem, in which the transport phenomena and chemical reactions are neglected and the controlling physics of droplet mass interminglement is emphasized. Furthermore, a parametric study for wide ranges of controlling non-dimensional parameters, such as the collision Weber number of 20-140 and the droplet size ratio of 1.3-2.0, further confirms that the non-monotonicity of ignition delay time with the impact parameter is a general characteristic of the present hypergolic system. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:276 / 289
页数:14
相关论文
共 48 条
  • [1] [Anonymous], 2010, ROCKET PROPULSION EL
  • [2] COALESCENCE AND SEPARATION IN BINARY COLLISIONS OF LIQUID-DROPS
    ASHGRIZ, N
    POO, JY
    [J]. JOURNAL OF FLUID MECHANICS, 1990, 221 : 183 - 204
  • [3] Simulation of Mixing within Drops due to Surface Tension Variations
    Blanchette, Francois
    [J]. PHYSICAL REVIEW LETTERS, 2010, 105 (07)
  • [4] Atomization by jet impact
    Bremond, N
    Villermaux, E
    [J]. JOURNAL OF FLUID MECHANICS, 2006, 549 : 273 - 306
  • [5] Brenn G, 2011, HANDBOOK OF ATOMIZATION AND SPRAYS: THEORY AND APPLICATIONS, P157, DOI 10.1007/978-1-4419-7264-4_7
  • [6] Chen X., 2011, 49 AIAA AER SCI M IN, P771
  • [7] Thickness-based adaptive mesh refinement methods for multi-phase flow simulations with thin regions
    Chen, Xiaodong
    Yang, Vigor
    [J]. JOURNAL OF COMPUTATIONAL PHYSICS, 2014, 269 : 22 - 39
  • [8] HIGH-FIDELITY SIMULATIONS OF IMPINGING JET ATOMIZATION
    Chen, Xiaodong
    Ma, Dongjun
    Yang, Vigor
    Popinet, Stephane
    [J]. ATOMIZATION AND SPRAYS, 2013, 23 (12) : 1079 - 1101
  • [9] Dambach Erik., 2010, 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference Exhibit, page, P6984
  • [10] Investigation into the Hypergolic Ignition Process Initiated by Low Weber Number Collisions
    Dambach, Erik M.
    Solomon, Yair
    Heister, Stephen D.
    Pourpoint, Timothee L.
    [J]. JOURNAL OF PROPULSION AND POWER, 2013, 29 (02) : 331 - 338