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为了研究侧载以及加热方位对矩形窄缝槽道内临界热流密度特性的影响,在旋转平台上进行了两相流的超重力实验.以蒸馏水为工质,通过改变质量流速、入口温度、侧载大小以及加热方位,获得了发生临界换热现象时的质量流速、实验段压降和壁温的变化趋势,考察了侧载和加热方位对临界热流密度的影响规律,并对侧载下两相流不稳定性进行了简析.实验表明:发生临界换热时,壁温迅速上升,有效加热热流开始减少,关闭加热电源后,实验段压降下降、质量流速回升较明显;侧载以及不同的加热方位对临界热流密度有明显影响;临界热流密度发生前后,蒸汽回流导致进口温度上升,增加了流动的不稳定性.
In order to study the influence of the side load and the heating azimuth on the critical heat flux density in a narrow rectangular channel, a two-phase supergravity experiment was carried out on a rotating platform. With distilled water as working fluid, the mass flow rate, inlet temperature, Size and heating azimuth, the changing trend of the mass flow rate, the pressure drop and the wall temperature in the experimental section were obtained. The influences of the side load and the heating azimuth on the critical heat flux density were investigated. The experimental results show that when the critical heat transfer occurs, the wall temperature rises rapidly and the effective heating heat flow begins to decrease. After the heating power is turned off, the pressure drop in the experimental section decreases and the mass flow rate rises more obviously. Of the heating azimuth has a significant impact on the critical heat flux density; before and after the critical heat flux density, the steam reflux leads to the inlet temperature rise, increasing the instability of the flow.