中国空间科学技术
中國空間科學技術
중국공간과학기술
Chinese Space Science and Technology
2015年
4期
46-52
,共7页
空间太阳能发电系统%热管吸热器%相变材料%空穴%相变%航天器
空間太暘能髮電繫統%熱管吸熱器%相變材料%空穴%相變%航天器
공간태양능발전계통%열관흡열기%상변재료%공혈%상변%항천기
Space solar power system%Heat pipe receiver%Phase change material%Void cavity%Phase change%Spacecraft
基于微重力条件下的导热控制微分方程,采用焓法对热管吸热器相变材料容器进行了二维数值建模与仿真,在同时考虑空穴和相变的情况下,对微重力条件下蓄热单元相变传热进行了模拟计算,分析了空穴率对蓄热容器内部的温度场和热性能的影响,并将计算结果同美国航空航天局(NASA )方案热管吸热器蓄热单元相变传热计算结果进行了比较,验证了文中微重力条件下计算模型的合理性与准确性。研究结果表明:空穴影响着蓄热单元相变的进程,空穴的存在增加了容器内部的温度梯度,使得容器的蓄热能力降低;由于热管径向温差较小,热管壁温在相变材料熔点附近变化较小,从而在一定程度上能缓解热斑和热松脱现象。
基于微重力條件下的導熱控製微分方程,採用焓法對熱管吸熱器相變材料容器進行瞭二維數值建模與倣真,在同時攷慮空穴和相變的情況下,對微重力條件下蓄熱單元相變傳熱進行瞭模擬計算,分析瞭空穴率對蓄熱容器內部的溫度場和熱性能的影響,併將計算結果同美國航空航天跼(NASA )方案熱管吸熱器蓄熱單元相變傳熱計算結果進行瞭比較,驗證瞭文中微重力條件下計算模型的閤理性與準確性。研究結果錶明:空穴影響著蓄熱單元相變的進程,空穴的存在增加瞭容器內部的溫度梯度,使得容器的蓄熱能力降低;由于熱管徑嚮溫差較小,熱管壁溫在相變材料鎔點附近變化較小,從而在一定程度上能緩解熱斑和熱鬆脫現象。
기우미중력조건하적도열공제미분방정,채용함법대열관흡열기상변재료용기진행료이유수치건모여방진,재동시고필공혈화상변적정황하,대미중력조건하축열단원상변전열진행료모의계산,분석료공혈솔대축열용기내부적온도장화열성능적영향,병장계산결과동미국항공항천국(NASA )방안열관흡열기축열단원상변전열계산결과진행료비교,험증료문중미중력조건하계산모형적합이성여준학성。연구결과표명:공혈영향착축열단원상변적진정,공혈적존재증가료용기내부적온도제도,사득용기적축열능력강저;유우열관경향온차교소,열관벽온재상변재료용점부근변화교소,종이재일정정도상능완해열반화열송탈현상。
High temperature heat pipe receivers are commonly used as a core component of space solar dynamic power system . On the base of heat conduction governing differential equation under microgravity , two‐dimensional numerical analysis of PCM container was conducted by a enthalpy method . With both void cavity and phase change considered , thermal performance of heat pipe receiver was analyzed . Numerical results were compared with NASA results . The accuracy of calculation model under gravity was verified .The results indicate that void cavity influences the process of phase change . T he void cavity reduces the utility and thermal storage ability of PCM . The temperature gradient of PCM zone is very significant because of the void cavity . The PCM contained in the integrated heat pipe performs the averaging function of the heat loads . Normal working of wick ensures the uniformity of heat pipe , thus heat pipe receiver alleviates thermal spot and thermal ratcheting .