| Analysis on the influencing factors of throat negative pressure for Venturi injector |
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| DOI：10.7606/j.issn.1000-7601.2013.06.014 |
| Key Words: Venturi injector throat negative pressure inlet pressure outlet pressure change regularity, influencing factors |
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| Abstract: |
| In order to understand the characteristics of Venturi injector, this paper has researched the pressure of inlet and outlet, flow velocity of the throat, the influences and change regularity of the coefficient of local head loss to the throat negative pressure by the theoretical analysis a
nd experimental measuring. The result showed that: The change of the throat negative pressure was submitted the decreasing negative linear correlation function, followed with increase of the inlet pressure. After the throat negative pressure decreased to the minimum value -0.09 MPa, the throat negative pressure will be no any impact by the inlet pressure increasing. There was some blocking function by outlet pressure to the throat water flow, so it will be influenced the generation of the throat negative pressure, the more outlet pressure, the more inlet pressure needed to produce the throat negative pressure and to reach the minimal negative pressure. The flow velocity of the throat to the production and change of the throat negative pressure was the similar effect as the inlet pressure. With regard to the different local water head loss coefficient as ξ1 and ξ2, the more of the ξ value, the slower of the reduced velocity as the throat negative pressure with the increase of the inlet pressure, the higher of the inlet pressure needed, when reached the minimal value of -0.09 MPa. |
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