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本文叙述了压力为80—140绝对大气压,重量流速W_(重量)为(5—17)×10~6公斤/米~2·小时,热焓差Δi_(欠热)为14—129大卡/公斤,q_(临界)=8.3×10~6—2.8×10~6大卡/米~2·小时,实验段长度为100毫米,直径为8毫米及环形流道间隙为3毫米的欠热水在套管内流动的临界热负荷试验结果。得出了80,100,110,120和140绝对大气压下的五个临界热负荷经验公式,按公式计算的值与试验数据偏差不超过±10%。将这些综合起来得到适用于80—140绝对大气压的综合公式: q_(临界)={2.8+0.4×10~(-8)[Δi_(欠热)W_(重量)+10~8((0.21-0.0015P)/0.000315P)]}×10~6大卡/米~2·小时。按此公式计算的值与现有数据的偏差不超过±15%;同时,发现对于固定Δi_(欠热)W_(重量)时,压力在80—140绝对大气压内,临界热负荷值随着压力的增加而降低。这点可作为压水反应堆设计者选择压力参数的依据之一。
This paper describes the pressure of 80-140 absolute atmospheric pressure, weight flow rate W_ (weight) of (5-17) × 10 ~ 6 kg / m ~ 2 · h, the enthalpy difference Δi_ (underheating) of 14-129 kcal / Kg, q_ (critical) = 8.3 × 10 ~ 6-2.8 × 10 ~ 6 kcal / m ~ 2 h, experimental length of 100 mm, diameter of 8 mm and annular channel gap of 3 mm of hot water Critical heat load test results for flow in bushing. Five critical heat load empirical formulas at 80, 100, 110, 120 and 140 absolute atmospheric pressures are obtained, and the calculated values by the formula are within ± 10% of the experimental data. Combining these gives a general formula for the absolute atmospheric pressure of 80-140: q_ (critical) = {2.8 + 0.4 × 10 -8 [Δi_ (underheated) W_ (weight) +10 to 8 0.0015P) /0.000315P)]} × 10 ~ 6 kcal / m ~ 2hr. According to this formula, the deviation from the existing data does not exceed ± 15%; meanwhile, it is found that for the fixed Δi_ (underheating) W_ (weight), the pressure is within 80-140 atm, the critical heat load value increases with pressure Increase and decrease. This is one of the bases on which pressure water reactor designers choose pressure parameters.