Numerical simulation of flow characteristics for a labyrinth passage in a pressure valve |
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Authors: | Hai-min WANG Yue ZHAO Jian-xing WANG Xiang-shuai KONG Huan LIU Ke-liang LI Xi-fang WANG |
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Affiliation: | Hai-min WANG;Yue ZHAO;Jian-xing WANG;Xiang-shuai KONG;Huan LIU;Ke-liang LI;Xi-fang WANG;School of Energy and Power Engineering,University of Shanghai for Science and Technology;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,University of Shanghai for Science and Technology; |
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Abstract: | A tortuous labyrinth passage consists of a series of right angle turns in a disk of high pressure control valve.In this paper,numerical simulations are made for the velocity and pressure distributions in this passage.It is shown that the "series passage" can induce a pressure dropping more effectively.The main function of the "series passage" is to induce a pressure dropping while the "parallel passage" is mainly to regulate the flow-rate.As a cross sectional area process,a series of reduction and expansion,the pressure will also see dropping and partial recovery,which is called the multistage pressure drop.By this way,the velocity can be controlled in a reasonable level anywhere in this tortuous labyrinth passage.With the fluid pressure dropping in a downwards serrated way,the pressure is higher than the local saturate vapor pressure,therefore,no cavitation is induced by the phase transition. |
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