Numerical simulation of liquid film converge characteristics of bipropellant pressure swirl injector
-
摘要:
为研究双组元离心喷嘴液膜的吸合特性，采用流体体积法（VOF）耦合Level Set方法对不同工况下双组元离心喷嘴进行数值计算，分析了喷嘴的流动特性，揭示了内外喷嘴锥形液膜之间的相互影响规律。研究结果表明：当外喷嘴的进出口压差大于1.6 MPa时出现吸合现象，过程表现为内外液膜逐渐重叠、相互吸合；吸合后喷嘴出口下游液雾速度相对减小；推力室室压的增加导致吸合时机缩短，而压差对吸合时机的影响相对较小，随着压差的增加其规律表现为先减小后增加。
Abstract:To study the convergence characteristics of the liquid film of a bipropellant pressure-swirl injector, numerical investigation of bipropellant pressure swirl injector was conducted based on the volume of fluid (VOF) coupled Level Set methods under different thruster chamber pressures and pressure drops. The atomization characteristics of the injector were analyzed, and the law of mutual influence between the inner and outer nozzle liquid films was revealed. The results showed that when the pressure drop of outer nozzle was greater than 1.6 MPa, the convergence phenomenon occurred, and the inner and outer spray films were gradually overlapped and converged with each other in the process. After convergence, the downstream speed of the injector outlet relatively decreased. The increase of the thrust chamber pressure led to the shortening of the convergence time, while the influence of the pressure drop on the convergence time was relatively small. With the increase of the pressure drop, the convergence time decreased at first and then increased.
-
图 3 验证对象试验及仿真结果（Δp=1 MPa）
Figure 3. Experiment and simulation results of verification object （Δp=1 MPa）
图 5 气液两相分布（X=0 mm截面，ΔpMMH=1.5 MPa，ΔpNTO=1.7 MPa，pc=5.5 MPa）
Figure 5. Gas-liquid two-phase distribution （X =0 mm section，ΔpMMH=1.5 MPa，ΔpNTO=1.7 MPa，pc=5.5 MPa）
图 7 速度分布沿径向变化（line 1, ΔpMMH=1.5 MPa，ΔpNTO=1.7 MPa，pc=5.5 MPa）
Figure 7. Velocity distribution along the radial direction （line 1, ΔpMMH=1.5 MPa，ΔpNTO=1.7 MPa，pc=5.5 MPa）
图 8 液相体积分数沿径向变化（line 1）
Figure 8. Liquid phase volume fraction changes along the radial direction （line 1）
图 9 压差对吸合时机以及质量流量的影响
Figure 9. Influence of pressure drop on converge time and mass flow rate
图 10 推力室室压对吸合时机的影响（ΔpNTO=1.7 MPa，ΔpMMH=1.5 MPa）
Figure 10. Influence of thruster chamber pressure on converge time （ΔpNTO=1.7 MPa，ΔpMMH=1.5 MPa）
表 1 物性参数表
Table 1. Property parameter table
物性参数 MMH NTO ρ/（kg/m3） 878 1450 μ/（Pa·s） 0.00085 0.00042 σ/（N·m） 0.034 0.0266 
下载: 导出CSV
表 2 不同计算工况
Table 2. Different calculation conditions
MPa 工况 ΔpMMH ΔpNTO pc 1 1.5 1.7 5.5, 5.8, 6.0, 6.5, 6.6 2 1.4～1.7 1.7 5.5 3 1.5 1.4, 1.6～1.8 5.5
下载: 导出CSV
-
[1] KIM J G,HAN Y M,CHOI H S,et al. Study on spray patterns of gas-centered swirl coaxial (GCSC) injectors in high pressure conditions[J]. Aerospace Science and Technology,2013,27(1): 171-178. doi: 10.1016/j.ast.2012.08.004 [2] KIM D,HAN P,IM J H,et al. Effect of recess on the spray characteristics of liquid-liquid swirl coaxial injectors[J]. Journal of Propulsion and Power,2007,23(6): 1194-1203. doi: 10.2514/1.30450 [3] RASHID M S F M,HAMID A H A,GHAFFAR Z A,et al. An experimental investigation on spray characteristics emanating from liquid–liquid coaxial swirl atomizer[C]//AIP Conference Proceedings. Malaysia: AIP,2012: 591-594. [4] KHIL T,CHUNG Y,BAZAROV V G,et al. Dynamic characteristics of simplex swirl injector in low frequency range[J]. Journal of Propulsion and Power,2012,28(2): 323-333. doi: 10.2514/1.B34169 [5] RAMEZANI A R,GHAFOURIAN A. Sprays angle variation of liquid-liquid swirl coaxial injectors[R]. AIAA 2005-3747,2005. [6] WANG Xingjian,HUO Hongfa,WANG Yanxing,et al. A three-dimensional analysis of swirl injector flow dynamics at supercritical conditions[R]. AIAA 2015-1827,2015. [7] MENG Hua,YANG V. A unified treatment of general fluid thermodynamics and its application to a preconditioning scheme[J]. Journal of Computational Physics,2003,189(1): 277-304. doi: 10.1016/S0021-9991(03)00211-0 [8] BARAN O,OZYORUK Y,SUMER B. Experimental and numerical investigation of coaxial pressure swirl injectors[R]. AIAA 2019-1740,2019. [9] 王尧. 液体同轴旋转射流破碎与雾化特性的实验研究[D]. 北京: 北京交通大学,2016. WANG Xiao. Experimental study on breakup and atomization characteristics of coaxial swirling liquid jet[D]. Beijing: Beijing Jiaotong University,2016. (in ChineseWANG Xiao. Experimental study on breakup and atomization characteristics of coaxial swirling liquid jet[D]. Beijing: Beijing Jiaotong University, 2016. (in Chinese) [10] 徐顺,康忠涛,成鹏,等. 喷注压降对液液同轴离心式喷嘴喷雾锥角的影响研究[J]. 推进技术,2017,38(7): 1556-1562. XU Shun,KANG Zhongtao,CHENG Peng,et al. Effects of injection pressure on spray angle of liquid-liquid swirl coaxial injector[J]. Journal of Propulsion Technology,2017,38(7): 1556-1562. (in Chinese doi: 10.13675/j.cnki.tjjs.2017.07.015 XU Shun, KANG Zhongtao, CHENG Peng, et al . Effects of injection pressure on spray angle of liquid-liquid swirl coaxial injector[J]. Journal of Propulsion Technology,2017 ,38 (7 ):1556 -1562 . (in Chinese) doi: 10.13675/j.cnki.tjjs.2017.07.015[11] 陈慧源,康忠涛,成鹏,等. 离心式喷嘴充填过程内部流动特性仿真[J]. 航空动力学报,2018,33(4): 944-951. CHEN Huiyuan,KANG Zhongtao,CHENG Peng,et al. Simulation of inner flow characteristics of swirl injector during the filing process[J]. Journal of Aerospace Power,2018,33(4): 944-951. (in Chinese doi: 10.13224/j.cnki.jasp.2018.04.021 CHEN Huiyuan, KANG Zhongtao, CHENG Peng, et al . Simulation of inner flow characteristics of swirl injector during the filing process[J]. Journal of Aerospace Power,2018 ,33 (4 ):944 -951 . (in Chinese) doi: 10.13224/j.cnki.jasp.2018.04.021[12] 丁佳伟. 液/液同轴旋转射流稳定性及液膜破碎机理研究[D]. 北京: 北京交通大学,2017. DING Jiawei. Study on stability and liquid sheet breakup mechanism of liquid/liquid coaxial swirling jets[D]. Beijing: Beijing Jiaotong University,2017. (in ChineseDING Jiawei. Study on stability and liquid sheet breakup mechanism of liquid/liquid coaxial swirling jets[D]. Beijing: Beijing Jiaotong University, 2017. (in Chinese) [13] HIRT C W,NICHOLS B D. Volume of fluid (VOF) method for the dynamics of free boundaries[J]. Journal of Computational Physics,1981,39(1): 201-225. doi: 10.1016/0021-9991(81)90145-5 [14] 郑刚,聂万胜,何博,等. 撞击角对撞击式喷嘴雾化特性影响研究[J]. 推进技术,2015,36(4): 608-613. ZHENG Gang,NIE Wansheng,HE Bo,et al. Effects of impingement angle on atomization characteristics of impinging jets injector[J]. Journal of Propulsion Technology,2015,36(4): 608-613. (in Chinese doi: 10.13675/j.cnki.tjjs.2015.04.018 ZHENG Gang, NIE Wansheng, HE Bo, et al . Effects of impingement angle on atomization characteristics of impinging jets injector[J]. Journal of Propulsion Technology,2015 ,36 (4 ):608 -613 . (in Chinese) doi: 10.13675/j.cnki.tjjs.2015.04.018[15] RIZK N K,LEFEBVRE A H. Internal flow characteristics of simplex swirl atomizers[J]. Journal of Propulsion and Power,1985,1(3): 193-199. doi: 10.2514/3.22780 [16] 陈晨. 敞口式离心喷嘴喷雾特性及应用研究[D]. 成都: 西南交通大学,2017. CHEN Chen. The spray characteristics and engineering application of an open-end swirl injector[D]. Chengdu: Southwest Jiaotong University,2017. (in ChineseCHEN Chen. The spray characteristics and engineering application of an open-end swirl injector[D]. Chengdu: Southwest Jiaotong University, 2017. (in Chinese) [17] RAZEGHI A,ERTUNC O. Numerical investigation of multiphase flow inside a pressure swirl atomizer at the initial stage of injection[J]. Atomization and Sprays,2018,28(5): 417-441. doi: 10.1615/AtomizSpr.2018022872 [18] 王凯,杨国华,李鹏飞,等. 离心式喷嘴内部流动过程数值仿真分析[J]. 火箭推进,2016,42(4): 14-20. WANG Kai,YANG Guohua,LI Pengfei,et al. Numerical simulation of internal flow process in pressure swirl injector[J]. Journal of Rocket Propulsion,2016,42(4): 14-20. (in Chinese doi: 10.3969/j.issn.1672-9374.2016.04.003 WANG Kai, YANG Guohua, LI Pengfei, et al . Numerical simulation of internal flow process in pressure swirl injector[J]. Journal of Rocket Propulsion,2016 ,42 (4 ):14 -20 . (in Chinese) doi: 10.3969/j.issn.1672-9374.2016.04.003[19] AMINI G. Liquid flow in a simplex swirl nozzle[J]. International Journal of Multiphase Flow,2016,79: 225-235. doi: 10.1016/j.ijmultiphaseflow.2015.09.004 -
点击查看大图
计量
- 文章访问数: 346
- HTML浏览量: 174
- PDF量: 55
- 被引次数: 0