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CMT排水过程中初始参数对流体温度分布及冷凝特性影响研究 【作者】彭云康 【导师】…

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CMT排水过程中初始参数对流体温度分布及冷凝特性影响研究水利论文Tn8J2W/Xw [$m

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作者彭云康导师】童明伟
'{9B+~eV6r0【作者基本信息】重庆大学,工程热物理,2003年,博士

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wg;} \$_ u%H&E@w0【中文摘要】 实验研究了CMT排水过程中初始参数对流体温度分布及汽液直接接触冷凝特性的影响。实验参数范围为:PRZ初始压力P=0.2~0.6MPa,CMT初始液温T=20~80℃。实验内容包括CMT无遮流板不排水、CMT无遮流板排水和CMT加遮流板排水三个方面。开展实验研究前利用FLUENT软件在不考虑蒸汽冷凝的条件下模拟分析了CMT内汽液两相及速度分布随时间的变化,其目的是为实验提供参考。计算结果表明,蒸汽进入CMT水中将带动水产生涡漩运动,引起换热面的较大变化。实验发现,CMT内温度分布和凝结特性主要受PRZ初始压力和CMT初始温度的影响,而压力响应主要受CMT初始温度影响。通过对CMT有、无遮流板的排水的实验结果进行比较,发现遮流板对系统的压力响应、温度分布以及凝结换热系数都有很大的影响。饱和蒸汽在CMT液面上的凝结分为三种模式,即蒸汽完全凝结模式、部分蒸汽快速凝结模式和蒸汽缓慢凝结模式。本文计算了蒸汽完全凝结模式和部分蒸汽快速凝结限制模式的平均冷凝换热系数以及蒸汽缓慢凝结模式的平均凝结换热系数,并在一定理论基础上回归了实验关系式。对实验测得的CMT径向和轴向温度分布进行了分析,发现在PRZ初...更多始压力相同时CMT无遮流板排水,其扰动时间随CMT液体平均温度的升高而减少,上下层液面温差随之变大;加遮流板后对凝结和温度平衡时间起主要影响的因素有两个,即遮流板以上液体的温度与PRZ的初始压力大小。CMT加遮流板排水时,流体温度场主要受PRZ初始压力影响,压力越大,热水层厚度增加。对实验测得不同初始条件下的压力响应数据进行分析,发现在CMT无遮流板排水实验中,压力平衡时间在PRZ初始压力超过0.3MPa时变化不大,而受CMT液体平均温度影响较大;遮流板减缓了蒸汽凝结的剧烈程度,大幅缩短了系统压力平衡需要的时间。 通过对不同初始条件下的CMT排水量进行了分析,发现CMT排水速度主要受CMT内的压力变化的影响:CMT无遮流板排水实验中所有排水量随时间的变化曲线都是单调递增的,且都有一个较为明显的拐点,在拐点后,斜率明显增大,说明排水速度增加显著;CMT加遮流板排水实验中排水量曲线的拐点不明显且出现时间较无遮流板排水实验要早,说明排水速度增加得较早;CMT加遮流板排水实验如果PRZ初始压力较大,通过改变CMT的初始温度,将会引起排水总量较大的变化;排水速度平衡时间受CMT压力平衡响应时间的影响,且较CMT压力平衡响应时间快。 <WP=6>通过对CMT内水的轴向温度分析,发现CMT内的流体具有热分层特性,即上部为热水层,下部为冷水层,热水层内温度变化剧烈,吸收了蒸汽在液面凝结放出的大部分热量。而冷水层的温度在实验过程中基本保持不变。PRZ初始压力越大,蒸汽射流的速度越高,形成的汽穴的深度越深,液面波动的越剧烈,压力平衡需要的时间越长,其热水层厚度增加。遮流板对减小凝结起着积极的作用,在蒸汽完全凝结和部分蒸汽快速凝结阶段下CMT加遮流板其凝结换热系数较无遮流板时减小了3—5倍。采用热力比RT(,RT>1即意味着冷凝能力大于蒸汽转换的能量,即蒸汽完全冷凝模式,RT<1即蒸汽不完全冷凝)作为蒸汽在过冷液面直接接触式冷凝模式的判断准则,获得了汽液直接接触冷凝模型。无遮流板排水蒸汽全部凝结阶段和部分蒸汽快速凝结阶段的平均换热系数实验关系式为,实验点落在预测值±16%以内;有遮流板排水蒸汽全部凝结阶段和蒸汽快速部分凝结阶段的平均换热系数实验关系式为,实验点落在预测值±19%以内;无遮流板排水实验缓慢凝结阶段平均换热系数实验关系式为,实验点落在预测值±20%以内;有遮流板排水实验缓慢凝结阶段平均换热系数实验关系式为,实验点落在预测值±19%以内。在RELAP5/MOD3程序中引入了实验获得的直接接触冷凝模型,模拟计算了CMT有、无遮流板时的排水特性,计算结果与实验结果有很好的一致性。说明本文建立的模型是合理的。  还原

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【英文摘要】 The experiment of CMT (Core Makeup Tank) drain has been conducted in this research. It aims to find the initial condition effect on the characteristic of pressure response, fluid. temperature distribution and condensation behavior. The experimental parameters were as follow: the initial pressure of pressurizer P=0.2-0.6MPa and the initial water temperature of CMT T=20-80 ℃. There are three kinds of experiment have been finished: CMT no drain, CMT drain with sparger, CMT drain without sparger . The experimental results show that the fluid temperature distribution and the condensation behavior in the CMT dependent on the initial pressure of pressurizer and the initial temperature of CMT. However, the pressure response of CMT is mainly affected by the initial temperature of CMT.The comparison of results between the CMT drain with sparger and the CMT drain without sparger indicates that the sparger has great affection on the system pressure response, temperature distribution and heat trans...更多fer coefficient. The condensation process of saturated steam is divided into three phase: steam supply limit, part steam rapid condensation and steam slow condensation. The heat transfer coefficients between the steam and water have been calculated according to different condensation modes. Also the heat transfer coefficient correlations have been obtained from the experimental data. After analyzing the radial and axial temperature distribution of CMT, the primary result has been concluded: With the same initial pressure of the CMT drainage with sparger, the higher the average temperature of CMT fluid is, the shorter the disturbing time, and the large the temperature difference of the top and bottom layer fluid. If the initial pressure goes beyond 0.3MPa, the disturbing time changes not obvious. With the same initial pressure of the CMT drainage with sparger, the higher the average temperature of CMT fluid is, the shorter the disturbing time, and the large the difference temperature of the top and bottom layer fluid. Once the sparger installed in the CMT, the fluid temperature above the sparger and the initial pressure of pressurizer are the key factor, which affect the condensation characteristic and temperature equilibrium time. The temperature distribution was mainly influenced by the initial pressure of pressurizer under the condition of CMT drainage with sparger, the higher the pressure is, the thicker the hot water layer.After analyzing the pressure response under different initial condition, the primary result has been concluded: When the pressure of pressurizer is higher than 0.3MPa, the <WP=8>pressure equilibrium time of the CMT drainage without sparger is influenced by the average temperature of the CMT fluid. The sparger alleviates the drastic degree of the steam condensation, and greatly shorten the time of pressure equilibrium needed. After analyzing the CMT drainage mass under different initial condition, the primary result has been concluded: The CMT drainage velocity is related to the change of CMT pressure, the drainage mass of CMT without sparger increase monotonously along with time, and has a obvious inflexion. After the inflexion, the slope steep evidently, which show that the drainage velocity augment remarkably. However, the drainage mass of CMT with sparger do not have the obvious inflexion, which shows the drainage velocity increase earlier. The drainage mass of the CMT with sparger varies as the temperature of CMT fluid if the initial pressure of pressurizer is higher. The equilibrium time of drainage velocity is greatly affected by the pressure response of CMT.After analyzing the fluid axial temperature distribution of CMT, the primary result was conduced: The fluid of CMT has the thermal stratification behavior. The upper part is hot water layer. The lower part is cold water layer. The temperature of the hot water layer changes greatly. The temperature of the cold water layer nearly keep a constant. The higher the initial pressure of pressurizer, the higher the velocity of steam jet, the d  还原

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【中文关键词】 堆芯补水箱; 凝结特性; 温度分布; 压力影响; 凝结换热系数; 直接接触冷凝; 热分层特性; RELAP5/MOD3水利论文.Qo+Dh;rYV X`6S%[V
【英文关键词】 core makeup tank; direct contact condensation; temperature distribution; heat transfer coefficient; pressure respond; thermal stratification behavior; RELAP5/MOD3
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TAG: 流体 特性 CMT 彭云康 温度分布
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