电弧风洞CO2介质运行分析

朱超, 陈德江, 周玮, 杜百合, 姚峰

朱超, 陈德江, 周玮, 杜百合, 姚峰. 电弧风洞CO2介质运行分析[J]. 实验流体力学, 2015, (1): 31-36. DOI: 10.11729/syltlx20140019
引用本文: 朱超, 陈德江, 周玮, 杜百合, 姚峰. 电弧风洞CO2介质运行分析[J]. 实验流体力学, 2015, (1): 31-36. DOI: 10.11729/syltlx20140019
Zhu Chao, Chen Dejiang, Zhou Wei, Du Baihe, Yao Feng. Evaluation of arc-heated wind-tunnel operation in CO2 atmosphere[J]. Journal of Experiments in Fluid Mechanics, 2015, (1): 31-36. DOI: 10.11729/syltlx20140019
Citation: Zhu Chao, Chen Dejiang, Zhou Wei, Du Baihe, Yao Feng. Evaluation of arc-heated wind-tunnel operation in CO2 atmosphere[J]. Journal of Experiments in Fluid Mechanics, 2015, (1): 31-36. DOI: 10.11729/syltlx20140019

电弧风洞CO2介质运行分析

详细信息
  • 中图分类号: 11-5266/V

Evaluation of arc-heated wind-tunnel operation in CO2 atmosphere

  • 摘要: 为开展金星和火星探测器地面防热试验研究,通过对CO2气体平衡成分分析、喷管流场计算和风洞运行能力分析,评估了电弧风洞模拟探测器进入 CO2大气环境时的防热试验能力。首先采用平衡常数法计算分析CO2气体在不同温度和压力下的平衡成分,接着利用一维等熵理想气体模型分析喷管内平衡流和冻结流2种流态下的流场参数,最后计算CO2介质运行时喷管出口的驻点参数,评估驻点压力和驻点热流的包络性能。结果表明:电弧风洞CO2介质运行时气流在加热器内含碳量高达30%,并可能在水冷壁上沉积,降低设备绝缘性能和换热效率,给设备安全运行带来隐患;在平衡流和冻结流2种流态下,喷管出口气流中均含有CO 和 O2,且CO 含量高达50%,为保护下游的真空设备和人员安全,防止反应生成的CO 浓度达到爆炸极限,给出了在扩压器补充惰性气体钝化的初步方案。
    Abstract: The main interest of this study is to investigate the performance of the arc-heated wind tunnel using CO2 as the test gas in order to develop heat shield materials for entering Venus and Mars atmospheres which are mainly composed of CO2 .Firstly,the mixture composition e-quilibrium of the CO2 atmospheres for a range of temperatures and pressures has been studied via the equilibrium constant method.Then,numerical simulations of the flow along the facility noz-zle have been performed using a one-dimensional isentropic method with and without freezing. The stagnation point parameters at the exit of the nozzle and theoretical performance map of the arc-heated wind tunnel with CO2 atmospheres have been calculated with one-dimensional method at the equilibrium with and without freezing,based on air envelope and neglecting the effect of arc-heater efficiency.It indicates that since the mole fraction of carbon in the arc-heated flow is as high as 30%,a large amount of carbon can be deposited onto the inside of the arc-heated wind tunnel,which can reduce the performance of insulation and heat conduction.There is a large a-mount of explosive gas CO at the exit of the nozzle no matter whether the flow is freezing or not, whose mole fraction can be as high as 50%.Therefore,it is suggested that all tests in the arc-heated wind tunnel for the simulation of CO2 atmospheres should be carried out using an addition-al inj ection gas such of N2 in the diffuser to deactivate the produced CO in order to protect the vacuum pump system and ensure the safety of people.
  • 期刊类型引用(4)

    1. 张璇,沈雪,田于逵,孙海浪,谢华,张楠. 平板边界层参数水槽测量与仿真分析研究. 实验流体力学. 2017(01): 26-31+46 . 本站查看
    2. 严宇超,姜澄宇,马炳和,薛晓晗,罗剑. 壁面剪应力标定方法研究综述. 实验流体力学. 2017(02): 20-25 . 本站查看
    3. 孙海浪,田于逵,金磊,张璇,谢华. MEMS热膜式壁面剪应力传感器微弱信号检测. 实验流体力学. 2017(02): 39-43 . 本站查看
    4. 田于逵,张璇,沈雪,孙海浪,谢华,张楠. 水下平板壁面剪应力MEMS测量研究进展. 实验流体力学. 2017(03): 82-87 . 本站查看

    其他类型引用(5)

计量
  • 文章访问数:  208
  • HTML全文浏览量:  52
  • PDF下载量:  13
  • 被引次数: 9
出版历程
  • 刊出日期:  2015-02-24

目录

    /

    返回文章
    返回
    x 关闭 永久关闭