以最佳溫度均勻度和最小熵產(chǎn)為目標(biāo)的航天器熱循環(huán)試驗(yàn)系統(tǒng)運(yùn)行參數(shù)優(yōu)化
發(fā)布時(shí)間:2019-02-12 09:46
【摘要】:以數(shù)值模擬的方法研究了不同運(yùn)行參數(shù)下航天器熱循環(huán)試驗(yàn)箱內(nèi)溫度均勻度與熵產(chǎn)的變化規(guī)律。結(jié)果表明,在4.3×103≤Re≤8.6×105、4.62×1013≤Gr≤1.38×1014范圍內(nèi),由于強(qiáng)浮升力的作用,壁面附近出現(xiàn)回流區(qū),溫度由上往下降低,中軸線附近氣體加速下沉,溫度由上往下升高。箱內(nèi)量綱1溫度標(biāo)準(zhǔn)偏差隨Reynolds數(shù)增大而增大,隨Grashof數(shù)變化不明顯;混合對(duì)流過程中流動(dòng)熵產(chǎn)遠(yuǎn)小于傳熱熵產(chǎn),熵產(chǎn)數(shù)值隨Reynolds數(shù)、Grashof數(shù)的增大而增大。提出了壁面Nusselt數(shù)、試驗(yàn)箱內(nèi)量綱1平均溫度、量綱1溫度標(biāo)準(zhǔn)偏差及量綱1傳熱熵產(chǎn)隨Reynolds數(shù)、Grashof數(shù)變化的關(guān)聯(lián)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,
本文編號(hào):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,
本文編號(hào):2420322
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