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本文研究了低压低质量流速条件下垂直圆管管内顶部骤冷过程中骤冷温度的分布特性。采用瞬态热块实验技术和非稳态两维数值分析技术，得到了实验段内壁温度随时问的分布规律：以此为基础，采用双切线交点模型，确定骤冷前沿点的位置，温度和时间，以相应的骤冷温度理论关系式为基础，同时考虑管道内流动参数对骤冷温度的影响，建立了本文的骤冷温度半经验关系式模型和半经验关系式。

A quenching experiment under top-down reflooding in a vertical tube wasperformed by adopting the transient hot block quenching test technique. Thetemperature history on the inner wall of test tube was calculated by using aquasi-steady-state two-dimension numerical technique, and the intersection ofdouble tangent lines was used to determine the location and the time of thequench front. Based on some theoretical models of quenching temperature, atthe same time, the effect of flow parameters in the tube during quenching wastaken into account, a semi-empirical correlation for quenching temperatureunder the low pressure and low mass flow rate is presented in this paper.It is as follows: Tq-TsTo-Ts=11.8362(Ts-T{f,inTo-Ts)-0.0714［(ck)w］0.2938G0.0251 (Ts-Tf,in)-0.3145 The parameter range of this correlation is as follow: system pressure:0.31 0.88 MPa; mass flux : 17.7 902 kg/m2s; inlet subcooling:3 77; initial hot-wall temperature: 450 600.