以最佳温度均匀度和最小熵产为目标的航天器热循环试验系统运行参数优化
发布时间:2019-02-12 09:46
【摘要】:以数值模拟的方法研究了不同运行参数下航天器热循环试验箱内温度均匀度与熵产的变化规律。结果表明,在4.3×103≤Re≤8.6×105、4.62×1013≤Gr≤1.38×1014范围内,由于强浮升力的作用,壁面附近出现回流区,温度由上往下降低,中轴线附近气体加速下沉,温度由上往下升高。箱内量纲1温度标准偏差随Reynolds数增大而增大,随Grashof数变化不明显;混合对流过程中流动熵产远小于传热熵产,熵产数值随Reynolds数、Grashof数的增大而增大。提出了壁面Nusselt数、试验箱内量纲1平均温度、量纲1温度标准偏差及量纲1传热熵产随Reynolds数、Grashof数变化的关联式。
[Abstract]:The variation of temperature uniformity and entropy production in a spacecraft thermal cycle test box with different operating parameters was studied by numerical simulation. The results show that in the range of 4. 3 脳 10 ~ 3 鈮,
本文编号:2420322
[Abstract]:The variation of temperature uniformity and entropy production in a spacecraft thermal cycle test box with different operating parameters was studied by numerical simulation. The results show that in the range of 4. 3 脳 10 ~ 3 鈮,
本文编号:2420322
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