磁控等离子体对收敛喷管性能的影响
Influence of magnetic plasma on performances of the convergent nozzle
-
摘要: 采用诱导磁场方程,Mixture混合两相流和磁场修正的湍流两方程模型,研究施加不同强度磁场时,收敛喷管内等离子体的流动和传热特性以及等离子体对尾喷流的包裹情况.结果表明,随着气流在收敛喷管内加速,等离子体被掺混的程度增加.增强磁场可提高近壁面处等离子体体积分数,抑制其湍流度,降低高温气体向喷管壁面的传热.当By=1.3T时,磁控等离子体可降低54.4%的壁面温升,增加0.74%的喷管推力系数,在出口4倍当量直径处对尾气仍有一定的包裹.Abstract: The characteristics of flow and heat transfer for plasma controlled by external magnetic fields in the convergent nozzle and the jet wrapped by the plasma were simulated using the models of magnetic induction equation,the multiphase flow mixture and modified turbulent two-equations under magnetic forces.The results show that the plasma volume fraction decreases with the acceleration of flow in the convergent nozzle.Magnetic intensity increase may improve the plasma volume fraction near the wall and suppress its turbulence strength,thereby cutting down the increase of nozzle wall temperature effectively.The rising wall temperature is reduced by 54.4%,the thrust coefficient is increased by 0.74% and the jet is still wrapped at 4D* from the nozzle exit after applying the 1.3 Tmagnetic field.
-
[1] Chapman J N,Schmidt H J,Ruoff R S,et al.Flight weight magnets for space application using carbon nanotubes[R].AIAA 2003-330,2003. [2] Bityurin V A,Bocharov A N,Baranov D S,et al.Study of MHD and on-board electrical power generation[R].AIAA 2006-1008,2006. [3] Bobashev S V,Erofeev A V,Lapushkina T A,et al.Air plasma produced by gas discharge in supersonic MHD channel[R].AIAA 2006-1373,2006. [4] Bityurin V A,Bocharov A N,Lineberry J.MHD flow control in hypersonic flight[R].AIAA 2005-3225,2005. [5] Udagawa K,Kaminaga S,Asano H,et al.MHD boundary layer flow acceleration experiments[R].AIAA 2006-3233,2006. [6] Bityurin V A,Bocharov A N,Lineberry J T,et al.Studies on MHD interaction in hypervelocity ionized air flow over aero-surfaces[R].AIAA 2003-4303,2003. [7] Ganiev Y C,Gordeev V P,Krasilnikov A V.et al.Theoretical and experimental study of the possibility of reducing aerodynamic drag by employing plasma injection[R].AIAA 99-0603,1999. [8] Khan O U,Hoffmann K A,Dietiker J F.Numerical study of magnetogasdynamic high speed flows over blunt bodies[R].AIAA 2006-966,2006. [9] Dietiker J F,Hoffmann K A.Numerical simulation of turbulent magnetohydrodynamic flows[R].AIAA 2001-2737,2001. [10] 张勃.大宽高比矩形喷管的射流掺混与红外抑制特性研究[D].南京:南京航空航天大学,2005.ZHANG Bo.Study of flow mixing and infrared suppression for rectangular nozzles with large aspect ratio[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2005. [11] Damevin H M,Dietiker J F.Hypersonic flow computations with magnetic field[R].AIAA 2000-0451,2000.
点击查看大图
计量
- 文章访问数: 1378
- HTML浏览量: 1
- PDF量: 449
- 被引次数: 0