Experimental Investigation On Two-phase Flow Distribution Inside Header Of Tower-type Solar Cavity Absorber

In recent years,the tower-type solar cavity heat absorber has great advantages of non-pollution and high heat flux.If there is a gas-liquid two-phase state in the partial distribution header of the cavity type heat absorber,if the divergence of the gas-liquid flow rate at the outlet branch pipe is too large,the heat transfer surface with high heat flux density will cause partial heat pipe heat to deteriorate and the heat The distribution of stress is extremely uneven or even risked squirting.According to the design parameters of the middle header of a 10MW tower solar heat absorber,the distribution header in the solar heat absorber is modeled according to the principle of geometry and flow,and a gas-liquid two-Exploring the distribution of gas-liquid flow distribution at the outlet of each branch pipe under the condition of stratified flow and wavy flow pattern.When different flow patterns enter the traditional header,it is found that the distribution of gas and liquid flow in each branch pipe is extremely uneven.Therefore,the distribution characteristics of each branch pipe are improved from changing the internal structure of the header.Firstly,the single-inlet distribution header was tested under two different flow patterns and three different structures,and the distribution characteristics and pressure drop of the three kinds of header structures were compared and analyzed.Then,Different flow patterns and two different structures.The distribution characteristics and pressure drop of the two kinds of header structures were compared and analyzed.Finally,while keeping the liquid phase velocity constant and increasing the gas velocity rapidly,The distribution characteristics of gas and liquid flow and the trend of pressure drop in each branch pipe between header and new header.The results show that the distribution function of the conventional flute with a uniform flute hole splitter is effectively improved under both stratified and wavy flow patterns,especially under wavy flow patterns.The pressure drop caused by the addition of the fluted splitter measured with the differential pressure gauge is also relatively low.