【摘要】：海洋核電站作為核能發(fā)展的一個新方向,成為目前研究的熱點。本文以海洋核電站堆芯組件的中心子通道在過冷沸騰工況下,受到搖擺運動為背景,通過數(shù)值模擬方法,進行了搖擺運動下過冷沸騰及核熱耦合特性的數(shù)值模擬研究及理論分析。本文基于三維計算流體力學(xué)(CFD)軟件Fluent,通過用戶自定義函數(shù)(UDF)接口,將搖擺及相間傳輸模型通過源項的方式添加到各控制方程并耦合核反饋模塊,建立了用于模擬搖擺條件下過冷沸騰及核熱耦合的程序。通過對該程序的各個模塊進行獨立模擬校驗,驗證了該方法的正確性。通過對搖擺條件下的過冷沸騰進行數(shù)值模擬,發(fā)現(xiàn)在反應(yīng)堆運行條件下,相對較低空泡份額工況下更容易受到搖擺運動的影響,造成空泡份額的波動。通過對壓降的分析發(fā)現(xiàn),搖擺會引起壓降的波動,但壓降的波動幅度不受搖擺周期和搖擺角度的影響。不同的搖擺周期和搖擺角度,對軸向的空泡份額變化和汽泡的徑向相對運動影響不同,搖擺周期越小、搖擺角度越大不但使軸向空泡份額越大,還會使徑向的汽泡相對運動速度越大,分析還發(fā)現(xiàn)汽泡脫離點附近區(qū)域?qū)u擺運動最為敏感。穩(wěn)態(tài)下的過冷沸騰核熱耦合計算,為搖擺條件下的過冷沸騰核熱耦合模擬提供了初始條件,得到的實際功率分布呈現(xiàn)出隨著高度的增加而減小的趨勢。與均勻熱流密度分布下的軸向空泡份額變化相比,實際功率分布下的軸向空泡份額變化受搖擺運動的影響更大;在考慮核反饋后,軸向的空泡份額波動受到明顯的抑制,保證了運行的穩(wěn)定和安全。對系統(tǒng)功率進行分析發(fā)現(xiàn),搖擺運動使整體空泡份額增大,由于系統(tǒng)的負反應(yīng)性,核反饋效應(yīng)會降低系統(tǒng)整體功率;但是由于軸向各段的空泡份額波動情況不同,軸向各段的功率波動呈不同的變化規(guī)律。
[Abstract]:As a new direction of nuclear energy development, marine nuclear power plant has become a hot spot in current research. In this paper, under the condition of subcooled boiling, the central sub-channel of the core assembly of the marine nuclear power plant is subjected to rocking motion, and the numerical simulation method is used. Numerical simulation and theoretical analysis of the characteristics of subcooled boiling and nuclear heat coupling under rocking motion were carried out. In this paper, based on 3D computational fluid dynamics (CFD) software Fluent, through user defined function (UDF) interface, the swinging and interphase transmission models are added to each control equation by source term and coupled with kernel feedback module. A program for simulating subcooled boiling and nuclear heat coupling under rocking conditions has been established. The correctness of the method is verified by independent simulation of each module of the program. By numerical simulation of subcooled boiling under rocking condition, it is found that under the condition of reactor operation, it is easier to be affected by rocking motion than under the condition of lower void fraction, resulting in the fluctuation of cavitation share. Through the analysis of the pressure drop, it is found that the swing will cause the fluctuation of the pressure drop, but the fluctuation amplitude of the pressure drop is not affected by the rocking period and the rocking angle. Different rocking periods and angles have different effects on the axial cavitation fraction and the radial relative motion of the bubble. The smaller the rocking period is, the larger the rocking angle is, and the larger the axial cavitation fraction is, It is also found that the relative velocity of the radial bubble is higher, and the region near the breakaway point is the most sensitive to the rocking motion. The calculation of subcooled boiling nucleus-heat coupling under steady state provides the initial conditions for the simulation of subcooled boiling nuclei and heat coupling under rocking conditions. The actual power distribution shows a decreasing trend with the increase of height. Compared with the change of axial cavitation share under uniform heat flux distribution, the axial cavitation share change under real power distribution is more affected by the rocking motion, and the fluctuation of axial cavitation share is obviously restrained after considering nuclear feedback. It ensures the stability and safety of the operation. By analyzing the system power, it is found that the motion of swinging makes the whole cavitation share increase, because of the negative reactivity of the system, the nuclear feedback effect will reduce the overall power of the system, but the fluctuation of the axial void share is different. The variation of axial power fluctuation is different.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK124;TM623

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