超临界水冷堆类三角形子通道内超临界水传热的试验研究

发布时间：2018-05-29 22:28

本文选题：超临界水 + 类三角形子通道　；参考：《华北水利水电大学》2015年硕士论文

【摘要】：超临界水冷堆(Supercritical water cooled reactor-SCWR)是第四代先进核能系统,是GIF重点研发第四代堆型。反应堆热工水力是SCWR研发基础,论文重点针对反应堆堆芯类三角形子通道内流动传热特性,开展试验研究,为SCWR热工准则和安全设计提供试验数据和传热特性预测方法,具有极其重要的工程应用价值和理论意义。论文在热流密度为200~800 k W/m2,压力为23~28 MPa,质量流速为700~1300kg/(m2·s)的参数范围,对棒径为8 mm,栅距比为1.4的SCWR类三角形子通道,进行了超临界水的流动传热试验研究。研究获得了类三角形子通道的轴向温度分布和典型传热特性,研究了参数对传热特性的影响,拟合出预测类三角形子通道内超临界水传热特性的试验关联式,并将试验数据与经典关联式进行了对比分析。SCWR类三角形子通道内超临界水的传热特性试验的研究表明,类三角形子通道轴向壁温沿流动方向逐渐升高,在大比热区(cp8.4 k J/(kg·K))壁温平缓,传热系数出现峰值,发生了传热强化。在压力和质量流速相同时,壁面温度随热流密度的增加而升高,传热系数峰值降低。而在质量流速和热流密度相同时,壁面温度随压力提高而增大,换热系数峰值减小。质量流速可以强化传热,质量流速增大,壁温降低换热系数增大。在远离大比热区的低焓值区热流密度和压力对传热的影响较小。而在大比热区内,传热系数受热流密度和压力的影响显著。传热系数峰值随热流密度和压力的增大而明显降低。随焓值增加,越过大比热区时,热流密度和压力和质量流速对传热系数的影响减小。试验研究还发现,当热流密度达到800 k W/m2时,壁温和传热系数表现出了异常规律,在大比热区,壁温不再随焓值平坦变化,换热系数峰值不明显。当压力提高到28 MPa时,在大比热区的强化传热作用被削弱。质量流速提高到一定程度时,其传热强化作用效果不如在低质量流速时明显。基于类三角形子通道内超临界水传热特性试验数据,拟合针对类三角形子通道中在超临界压力下远离大比热区高焓值区域和低焓值区的试验关联式,两个拟合关联式计算值与试验数据吻合的比较好。在与常用超临界传热经验关联式的对比中,所选五组经典关联式的预测结果较试验结果偏大,整体预测存在偏差。Jackson公式和Bishop预测数值整体上与试验数据吻合稍好。本研究得到国家自然基金NO.5146026和河南高校创新人才NO.2012HASTIT018的资助。
[Abstract]:The supercritical water cooled reactor (Supercritical water cooled reactor-SCWR) is the fourth generation advanced nuclear energy system. It is the focus of the research and development of the fourth generation reactor. The thermal hydraulic power of the reactor is the foundation of SCWR research and development. The paper focuses on the flow and heat transfer characteristics in the triangle subchannel of the reactor core, open and open the test and study for the SCWR thermal criterion and the safety design. The method for prediction of test data and heat transfer characteristics is of great importance in engineering application and theoretical significance. In this paper, the flow transmission of supercritical water is carried out in the heat flow density of 200~800 K W/m2, pressure of 23~28 MPa, mass velocity of 700~1300kg/ (M2 s), and SCWR type triangle subchannel with a diameter of 8 mm and a distance ratio of 1.4. The axial temperature distribution and typical heat transfer characteristics of the sub triangle subchannel are obtained. The influence of the parameters on the heat transfer characteristics is studied. The experimental correlations for the prediction of the heat transfer characteristics of the supercritical water in the triangle subchannel are fitted, and the experimental data are compared with the classical correlation to analyze the.SCWR triangle subtypes. The study on the heat transfer characteristic test of the super critical water in the channel shows that the wall temperature of the sub - channel axis increases gradually along the flow direction, and the wall temperature is gentle in the large specific heat zone (cp8.4 K J/ (kg. K)), the heat transfer coefficient has a peak value, and the heat transfer intensification occurs. When the mass velocity and the heat flux are the same, the wall temperature increases with the pressure, and the peak value of the heat transfer coefficient decreases. The mass velocity can strengthen the heat transfer, the mass velocity increases, the wall temperature decreases and the heat transfer coefficient increases. The heat flow density and pressure in the low enthalpy zone far away from the large specific heat area have little effect on the heat transfer. In the region, the heat transfer coefficient is significantly affected by the heat flux density and pressure. The peak value of heat transfer coefficient decreases obviously with the increase of heat flux and pressure. With the increase of enthalpy, the influence of heat flux and pressure and mass velocity on the heat transfer coefficient decreases with the increase of the enthalpy value. The experimental study is also present, when the heat flux reaches 800 K W/m2, the wall is mild. The heat transfer coefficient shows an abnormal law. In the large specific heat zone, the wall temperature no longer varies with the enthalpy, and the peak value of the heat transfer coefficient is not obvious. When the pressure is raised to 28 MPa, the enhancement of heat transfer is weakened. When the mass velocity is raised to a certain extent, the effect of the heat transfer is not as obvious as at the low mass velocity. Based on the class three The experimental data of the supercritical water heat transfer characteristics in the angular subchannel are fitted to the experimental correlations between the high enthalpy region and the low enthalpy zone in the super critical pressure region under the supercritical pressure. The calculated values of the two fitting correlations are in good agreement with the experimental data. In comparison with the commonly used empirical correlations for the common supercritical heat transfer, The results of the selected five groups of classic correlations are larger than those of the test results. The overall prediction has a deviation.Jackson formula and the Bishop prediction value is in good agreement with the experimental data. This study is supported by the national natural fund NO.5146026 and the innovative talents NO.2012HASTIT018 of Henan University.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK124

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