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Method for restraining cavitation generation and flow separation in blade of liquid machine

A flow separation and vane technology, applied in the direction of hydrodynamic characteristics/hydrostatic characteristics, hull, hull design, etc., to achieve the effects of improving energy utilization, suppressing primary and cavitation forms, and increasing lift-to-drag ratio

Inactive Publication Date: 2010-06-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People have spent a lot of energy to study the mechanism of cavitation, but how to control the generation of cavitation? How to suppress noise and vibration caused by cavitation shedding? Still a problem that hasn't been well resolved

Method used

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  • Method for restraining cavitation generation and flow separation in blade of liquid machine
  • Method for restraining cavitation generation and flow separation in blade of liquid machine
  • Method for restraining cavitation generation and flow separation in blade of liquid machine

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: see figure 1 , The method for suppressing cavitation in a liquid machine blade is characterized in that a rotating cylinder is installed to form a moving surface (2) on the leading edge of the blade (1) in the liquid machine or a low-pressure flow area where "cavitation" is prone to occur, so as to form a moving surface (2). The pressure of the liquid in this area is higher than the saturation pressure, avoiding the occurrence of vaporization, suppressing the occurrence of initial cavitation, and realizing the suppression of cavitation.

Embodiment 2

[0019] Example 2: see Figure 4 , This method of suppressing cavitation in liquid machinery blades, for the blade (1) of a tidal turbine, on the leading edge of the blade (1), a rotating cylinder is installed to form a moving surface (2), and the surface speed of the rotating cylinder is the flow of water. 0.1 to 100 times the speed. This method can not only control the initial cavitation, but also improve the lift coefficient of the blade and improve the utilization rate of water energy.

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Abstract

The invention relates to a method for restraining cavitation generation and flow separation in a blade of a liquid machine. In the method, a moving surface is arranged at a position of a low-pressure flow region which is easy to generate the cavitation or flow separation on the front edge of the blade or on the blade, so the blade surface moves locally, and the pressure distribution on the blade surface is changed, the liquid passing through the surface dose not generate the cavitation or change the cloud cavitation bubble form and the flow separation form, the restriction or control of the cavitation and flow separation is realized so as to restrict the noise and vibration generated in the liquid machine and improve the utilization factor of the water energy or the efficiency of liquid machines such as a water pump and a water turbine.

Description

technical field [0001] The invention relates to a method for inhibiting or controlling cavitation and flow separation in a liquid machine blade, in particular to a method of increasing the local pressure in the low-pressure area on the blade surface through surface motion, thereby inhibiting or controlling the generation of cloud cavitation and flow separation . A method and device for improving energy utilization. technical background [0002] At a certain temperature, when the pressure of the liquid is lower than its saturated vapor pressure, the liquid will vaporize, resulting in cavitation. During the operation of the propeller, if the absolute pressure of the local area of ​​the overflow part (usually later at the inlet edge of the impeller blade) drops to the vaporization pressure at the local temperature, the liquid begins to vaporize there, producing bubbles. The bubbles flow forward with the liquid, resulting in sheet cavities attached to the solid surface. As the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B1/38
CPCY02T70/122Y02T70/10
Inventor 黄典贵张媛媛
Owner SHANGHAI UNIV