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以超临界水冷堆燃料性能验证试验为背景,对带有螺旋绕丝的2×2棒束内超临界水的传热特性进行了试验研究。试验参数范围为:压力23~28 MPa,质量流速400~1 000kg/(m2·s),壁面热流密度200~1 000kW/m2。通过试验,获得了加热管周向壁温的分布规律,并分析了热流密度、质量流速、压力、螺旋绕丝对壁温和换热系数的影响。研究结果表明,加热管周向壁温呈现非均匀、非对称分布的特性,最高壁温出现在边角子通道或螺旋绕丝覆盖的位置。在拟临界区,换热系数随热流密度的升高或质量流速的降低而迅速减小,而随压力的变化较微弱。相对于光滑2×2棒束,螺旋绕丝不仅改变了周向壁温分布规律,同时也提高了平均换热系数。
Based on the verification of supercritical water cooled reactor fuel performance, the heat transfer characteristics of supercritical water in a 2 × 2 rod bundle with helical wrap were studied. Test parameters range: pressure 23 ~ 28 MPa, mass flow rate 400 ~ 1 000kg / (m2 · s), wall heat flux density 200 ~ 1 000kW / m2. Through the experiment, the distribution rule of the circumferential wall temperature of the heating pipe was obtained, and the influence of heat flux, mass flow rate, pressure and spiral wound wire on the wall temperature and heat transfer coefficient were analyzed. The results show that the circumferential wall temperature of the heating tube presents a non-uniform and asymmetrical distribution, and the highest wall temperature appears at the position of the corner sub-channel or the spiral wound wire. In the pseudo-critical zone, the heat transfer coefficient decreases rapidly with the increase of heat flux density or mass flow rate, and changes little with the pressure. Compared with the smooth 2 × 2 rod bundle, spiral wound wire not only changed the regular distribution of wall temperature, but also increased the average heat transfer coefficient.