| The distribution characteristics of gas-liquid two phase flow in double entrance radial multiple parallel branch headers are studied experimentally. There are3groups of test section, the number of branch pipe is respectively7,8and11, the distance of the two entrance between group A and group B is different. Both the number of the branches and the length of the header of group A and group B are different. In order to discuss how the headers’geometrical factors to affect the gas-liquid flow distribution. In addition, installing flute distributor in each tests to discuss the influence of the flute distributior on gas-liquid flow distribution. Through the experiment we can discover that the geometrical structure have a great influence on the gas-liquid flow distribution in branch tubes. With the increasing of the branch number, at the same mass flow rate, the gas-liquid flow distribtion will be deteriorative, but the entrance prssure willl be also increased. When the distance between two entrance increases, the gas-liquid flow distribution will be improved. The flute distributor can improve the gas-liquid flow distribution,but when the branch tubes number and headers’lenth increase, the effect will be weakened. When the entrance mass quality increase, the uniformity of gas-liquid flow distribution will be weaken, the increase of the entrance pressure will reduce the flow deviation.The individual branch tubes’excess and leak in ceiling superheater are analyzed. Trough the resistance calculation about each ceiling superheaters, flow rate in each superheaters is gotten, using ANSYS CFX simulated the gas-liquid flow and distributon, find that tee effect caused the overtemperature of ceiling superheater branch tubes, In this paper, based on the simulation result, the superheater’s geometricstructure was improved, and achieved good results. |
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