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改进型回路脉动热管可视化及传热性能研究
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摘要
脉动热管是一种新型高效的传热元件,随着散热技术要求的提高而受到更多的关注。脉动热管虽然结构简单,但由于工质状态为气液两相流,运行机理相当复杂,在实验研究和理论研究方面都需要不断提高,从而为实际工程提供技术支持。
     本文搭建脉动热管实验台,对改进型回路脉动热管进行可视化实验和传热性能分析,明确了研究目标:观测改进型回路脉动热管工质流型及流动方式;分析脉动热管的启动运行温度特征曲线;分析脉动热管的传热性能;针对改进型回路结构分析温度脉动的非线性混沌特性。
     具体的研究内容主要包括以下几个方面:
     1.制作3个可视化试件,采用蒸馏水,无水乙醇和丙酮为工质,实验中观测到工质脉动中出现的主要流型为泡状流,汽液塞间隔分布的塞状流,塞状流与环状流并存的混合流,并没有在整个通道中观察到完全是环状流的流型。在不同阶段(充液阶段,启动阶段,运行阶段),不同放置方式和不同充液率下分析了工质的流动方式。
     2.针对试件2对改进型回路板式脉动热管的启动阶段,稳定运行和干烧阶段的温度特征曲线进行分析。启动阶段壁面温度特征为温度渐进式启动,即温度缓慢地上升至脉动热管的稳定运行温度,然后缓慢进入稳定运行状态。从加热功率,倾斜角度,充液率,工质热物性和冷却水流量角度分析了不同因素对脉动热管启动的影响。
     3.针对试件2和试件3分析了改进型回路板式脉动热管的传热性能。结果表明,脉动热管运行时存在一个最佳水流量,增大冷却水流量在一定程度上能够提高脉动热管的传热极限,在有倾角的工况下提高传热极限表现的更为明显;脉动热管在倾角为90°~60°范围运行时,倾角对传热的影响并不明显,但是倾角继续减少至45°和30°时,脉动热管不能稳定运行,传热恶化;在相同工况下试件2的传热性能优于试件3。
     4.采用温度时间序列的相空间重构方法,对改进型回路脉动热管进行混沌分析,通过三维空间的吸引子分布状态能够反映出脉动热管的运行状态。随着加热功率的升高,吸引子从分散状态逐渐过渡到团状分布,然后再次过渡到分散状态,这说明脉动热管从启动之初的温度不稳定脉动过渡到稳定运行阶段,然后从稳定运行又逐渐向干烧阶段过渡。通过吸引子的分布特征可以表明改进型回路脉动热管存在混沌动力学特征。
Pulsating heat pipe (PHP) is a kind of new efficient heat transfer element, whichis paid more attention for cooling technology requirement improving. It possessessimple structure. However, working fluid state in PHP is gas-liquid two-phase flow,which causes complex operation mechanism of PHP. Experiment and theory studyneed constant improvement, so practical engineering can be provided technicalsupport.
     Visualization and heat transfer performances were investigated by experiment.Research targets were as follows:(1) Observation of flow pattern and flow mode ofimproved closed loop PHP.(2) Analysis of start and operation characteristic curve.(3)Analysis of heat transfer performances.(4) Analysis of nonlinear chaoticperformance.
     Specific research contents were as follows.
     1. There were three visual specimens. Distilled water, ethanol and acetone wereused as the working fluids. It was found that flow pattern of working fluid includedbubbly flow, plug flow and mixed flow (plug flow and annular flow), but there wasno annular flow distributed in the whole channel. Flow modes of working fluid wereinvestigated with different stages (filling liquid stage, start, operation stage),inclination and filling ratios.
     2. Start and operation characteristic curve of improved closed loop flat plate PHPwas studied with specimen NO.2. Start of PHP is of temperature progressive start, thatis to say, temperature rows slowly to stable operation temperature and then steps intostable operation stage. Moreover, input power, inclination, filling ratio, thermalproperties of working fluid and cooling water flow on start were investigated.
     3. Heat transfer performances of improved closed loop flat plate PHP werestudied by specimen NO.2and specimen NO.3. It was found that there was theoptimal cooling water flow during operation. Heat transfer limit can be improved tosome extant with cooling water flow increasing, which is more obvious withinclination. Heat transfer performances were not obvious with inclination range from60°to90°. However, PHP cannot operate with small inclinations of45°and30°. Heat transfer performances of specimen NO.2were better than specimen NO.3at the sameconditions.
     4. Chaotic performance of PHP was analyzed with phase space reconstruction oftemperature time sequence. Operation state of PHP can be reflected by distribution ofthree-dimensional space attractor. Attractors firstly disperse in the whole phase space,then appear mass status, finally transit to banding and distribute in the whole spacewith input power increasing. The phenomenon of attractor showed three operationstages of PHP, which are unstable pulsation stage, stable pulsation stage anddry-burning stage. Improved closed loop PHP possesses chaotic dynamiccharacteristics by attractor distribution.
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