宇航学报 ›› 2018, Vol. 39 ›› Issue (6): 702-708.doi: 10.3873/j.issn.1000-1328.2018.06.014

• 飞行器试验与发射 • 上一篇    

高温风洞收集口喷水降温数值仿真研究

姜一通,张利嵩,邹样辉,田宁,李彦良   

  1. 1. 北京航天长征飞行器研究所高超声速飞行器防隔热技术中心,北京 100076;
    2. 北京航空航天大学能源与动力工程学院,北京 100191
  • 收稿日期:2017-09-07 修回日期:2018-02-06 出版日期:2018-06-15 发布日期:2018-06-25

Numerical Simulation Research on Cooling Effect of High Temperature Wind Tunnel by Water Injection

JIANG Yi tong, ZHANG Li song, ZOU Yang hui, TIAN Ning, LI Yan liang   

  1. 1. Hypersonic Vehicle Research Center of Thermal Protection and Insulation,Beijing Institute of Space Long March Vehicle, Beijing 100076, China;  2. School of Energy and Power Engineering,Beihang University, Beijing 100191, China
  • Received:2017-09-07 Revised:2018-02-06 Online:2018-06-15 Published:2018-06-25

摘要:

针对高温风洞中扩压器前段壁面防热问题,提出对高温气流外缘喷水降温的方法。通过在收集器入口与喷管出口间安装喷水环,利用液态水汽化吸热对高温气流进行降温,使扩压器壁面形成低温保护层。为了解该方法降温效果,本文利用DPM、组分输运等模型的耦合建立了超声速两相流CFD模型,对向超声速热气流喷水进行降温的过程进行了数值计算,计算结果表明,扩压器启动后有显著的降温保护效果。同时,为探索风洞排气背压和喷水量对风洞流场和壁面降温效果的影响,通过计算得出了变排气背压、变喷水量与降温效果之间的关系,为高温风洞收集口喷水降温装置的优化设计提供了参考。

关键词: 高温风洞, 扩压器, 喷水, 降温, 两相流, 数值仿真

Abstract:

In the hypersonic high-temperature wind tunnel, the hot airflow gushes from the Laval nozzle and then be expelled through the diffuser. Because the front wall of the diffuser is subjected to the prolonged high temperature airflow erosion and continuous shock wave reflection, it is very easy to cause serious ablation if the heat protection design allowance is insufficient. In order to protect the front wall of the diffuser, it is suggested that the water injection can be used to cool the edge of the high temperature airflow. Through installing water-injection ring between the nozzle exit and the entrance of the diffuser, vaporizing heat absorption can be utilized and a layer of low temperature water vapor is formed to protect. To understand the cooling effect of the water injection, by using the sub-models such as DPM, a supersonic two-phase CFD model is established. Calculation result shows that there is a significant protective effect on the wall by the water injection. At the same time, to explore the back pressure and water spray quantity’s influence on the state of the flow field and the effect of cooling, different working conditions are calculated by varying the exhaust back pressure and water spray quantity, which is useful for the optimizing design of the cooling system in high-temperature wind tunnel.

Key words: High temperature wind tunnel, Diffuser, Water spray, Cooling, Two phase flow, CFD

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