| Numerical simulation of flow in swirl injector for power-law fluid |
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| 作者姓名： | WANG Feng FU Qing-fei YANG Li-jun |
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| 作者单位： | School of Astronautics, Northwestern Polytechnical University, Xi’an 710072;School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| 基金项目： | Beijing Natural Science Foundation (Support number:8112026) |
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| 摘 要： | In order to investigate the flow characteristics of swirl injectors for gelled propellants, which actually behaved as non-Newtonian power-law fluid, a swirl axisymmetric model was established to solve Navier-Stokes equations and VOF (volume of fluid) equation, and the power-law constitutive equation was used to describe the rheology characteristics of the gelled propellants. The film thickness and velocity distribution in the swirl injector under different flow conditions were studied numerically. The simulation results show that the increased geometry characteristic parameter of the swirl injector contributes to the decrease of liquid film thickness. The liquid film thickness is almost independent of the pressure drop. The rheologic parameters have great influences on the inner flow of swirl injector: by increasing the fluid consistency index K and power index n, both the axial and the swirl velocities decrease dramatically; higher fluid consistency index K and power index n make the liquid film thickness increase. When the viscosity is large enough, the air core in the injector would vanish.
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| 关 键 词： | numerical simulation gelled propellants power-law fluid swirl injector inner flow |
| 收稿时间： | 5/9/2011 12:00:00 AM |
| 修稿时间： | 2012/1/13 0:00:00 |
Numerical simulation of flow in swirl injector for power-law fluid |
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| WANG Feng,FU Qing-fei,YANG Li-jun.Numerical simulation of flow in swirl injector for power-law fluid[J].Journal of Aerospace Power,2012,27(4):890-899. |
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| Authors: | WANG Feng FU Qing-fei and YANG Li-jun |
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| Institution: | School of Astronautics,Northwestern Polytechnical University,Xi’an 710072,China;2.School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191,China) |
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| Abstract: | In order to investigate the flow characteristics of swirl injectors for gelled propellants, which actually behaved as non-Newtonian power-law fluid, a swirl axisymmetric model was established to solve Navier-Stokes equations and VOF (volume of fluid) equation, and the power-law constitutive equation was used to describe the rheology characteristics of the gelled propellants. The film thickness and velocity distribution in the swirl injector under different flow conditions were studied numerically. The simulation results show that the increased geometry characteristic parameter of the swirl injector contributes to the decrease of liquid film thickness. The liquid film thickness is almost independent of the pressure drop. The rheologic parameters have great influences on the inner flow of swirl injector: by increasing the fluid consistency index K and power index n, both the axial and the swirl velocities decrease dramatically; higher fluid consistency index K and power index n make the liquid film thickness increase. When the viscosity is large enough, the air core in the injector would vanish. |
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| Keywords: | numerical simulation gelled propellants power-law fluid swirl injector inner flow |
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