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在压力为11~19 MPa,质量流速为700~1300 kg/(m2·s),热流密度为200~600 k W/m2的工况范围内,对超临界水冷堆(SCWR)堆芯棒直径为8 mm,栅距比为1.2的类四边形子通道的传热特性进行试验研究。结果表明:热流密度对类四边形子通道管管内的传热特性的影响显著,热流密度越高,传热恶化越容易发生;在较低的质量流速下,传热恶化发生可能性较大,质量流速较高时,对传热特性影响较小;压力对类四边形管管内传热特性的影响明显,压力越高,传热恶化现象越易发生,且临界干度值越低,传热恶化所覆盖的焓值区域越大。
Under the conditions of 11 ~ 19 MPa pressure, mass flow rate of 700 ~ 1300 kg / (m2 · s) and heat flux density of 200 ~ 600 k W / m2, the diameter of core rod of SCWR Experimental study on the heat transfer characteristics of a quasi-tetragonal subchannel of 8 mm with a pitch ratio of 1.2. The results show that the heat flux density has a significant influence on the heat transfer characteristics of the quasi- quadrangular subchannel tubes. The higher the heat flux density, the more likely it is to reduce the heat transfer. The lower the mass flow rate, The effect of pressure on the heat transfer characteristics of quasi-rectangular tubes is obvious when the flow rate is high, the heat transfer is more likely to occur when the pressure is higher, and the lower the critical dryness value is, the worse the heat transfer is The larger the enthalpy area covered.