不同膨胀状态下拉瓦尔喷管内耦合传热数值研究  

Numerical study on the conjugate heat transfer of a laval nozzle under different expansion states

作　　者：刘锐[1] 陈雄[1] 周长省[1] 李映坤 

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《固体火箭技术》2014年第4期480-485,共6页Journal of Solid Rocket Technology

摘　　要：为研究不同膨胀状态下拉瓦尔喷管内流场结构及壁面传热特性,开发了一套耦合传热程序。流体区域和固体区域的控制方程均采用Navier-Stokes方程,计算方法为基于格心的有限体积法,湍流模型采用k-ωSST模型,通过保证流固耦合界面上的热流密度连续,实现耦合传热。验证该耦合传热程序后,对处于不同膨胀状态下的喷管进行了数值模拟。计算结果表明,过膨胀状态下喷管产生流动分离,分离点附近的对流换热增强,而在之后的绝大部分区域内气体是对壁面进行冷却,但冷却强度较低。当地对流换热会随着喷管入口压力的增加而增强。A conjugate heat transfer（ CHT） code was developed to study the flow structure and heat transfer of a nozzle under different expansion states.Navier-Stokes equations were used to govern both fluid and solid regions,cell-center based finite volume method was adopted to solve the governing equations,and k-ω SST model was used for turbulence closure.The CHT process is realized by keeping the heat flux on the coupled surface to be consistent.The CHT code is validated by experimental data,then used to numerically investigate a nozzle under different expansion states. The simulated results show that the flow separation occurs in the nozzle under over-expanded state,and the convective heat transfer is enhanced in the separation region and the nozzle wall is cooled by the gas in the downstream region of the separation with a relatively low level.The local convective heat transfer increases with the nozzle inlet pressure.

关 键 词：喷管 不同膨胀状态 耦合传热 流场结构 

分 类 号：V435.11[航空宇航科学与技术—航空宇航推进理论与工程]