A jet device and design method for effectively suppressing cavitation on blade surface

A technology of jet device and surface cavitation, applied in components, design optimization/simulation, computer-aided design, etc. of pumping device for elastic fluid, to achieve the effect of suppressing shedding

Active Publication Date: 2019-11-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The present invention is applied to the design field of the jet flow generation system on the blade surface of the hydraulic machinery, aiming at solving the problems caused by the jet flow generation in the water tunnel cavitation experiment, a jet flow generation system that meets the requirements of the blade surface of the hydraulic machinery is proposed

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  • A jet device and design method for effectively suppressing cavitation on blade surface

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Embodiment Construction

[0019] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0020] Such as figure 1 As shown, the present invention is a jet device and a design method for effectively suppressing cavitation on the blade surface, mainly consisting of a pump 1, a three-way valve 2, a flow meter 3, a PVC pipe 4, an elbow 5, a blade cavity connecting pipe 6, Composed of blades 7, water tanks 8, jet holes 9, blade cavities 10, and metal pipes 11;

[0021] (1) According to the needs of the design, the flow rate of the selected pump is 2800L / h, the diameter of each interface in the whole pipeline is 20cm, and the diameter of the PVC pipe and the metal pipe is also 20cm; the structure of the original hydraulic mechanical blade 7 is NACA66 (MOD) airfoil, The vane angle of inflow is 8°, the incoming flow velocity is 11.83m / s, the incoming flow pressure is 101.325kPa, the temperature is 20°C...

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Abstract

The invention relates to a jet device for effectively inhibiting the cavitation of a blade surface, and a design method applied to the field of hydraulic mechanical designs. A pump is connected with athree-way valve through a metal pipe; a jet flow rate of each working condition is adjusted by utilizing the three-way valve; a change of the jet flow rate of each working condition is observed through a flow meter; the pump is arranged in a water tank; the three-way valve is connected with the flow meter through a polyvinyl chloride (PVC) pipe; the flow meter is connected with a bend inlet through a PVC pipe; a bend outlet is connected with a blade cavity connecting pipe; the blade cavity connecting pipe communicates with a blade cavity; and jet holes are formed in the blade surface. Compared with the condition that no jet exists on the blade surface, according to the cavitation inhibition provided by the invention, under the condition that a jet exists on the blade surface, the cavitation length and the thickness of a cavitation hole are remarkably reduced. A re-jet flow is resisted, the jet formed on the blade surface through a jet producing device can resist the re-jet flow formedon a blade trailing edge, and the shedding and the collapsing of the cavitation hole are inhibited.

Description

technical field [0001] The invention relates to a device in the field of hydraulic machinery design, in particular to a jet device and a design method for effectively suppressing cavitation on the blade surface in the hydraulic machinery. Background technique [0002] Cavitation causes different degrees of vibration, impact and noise, aggravates cavitation on the surface of objects, and causes early fatigue of the structure. In order to avoid this phenomenon that is harmful to hydraulic equipment, it is necessary to apply various active and passive control methods to hydraulic equipment to effectively suppress cavitation inception and cavitation shedding, reduce cavitation collapse in the cavitation process to a certain extent, and reduce the risk of damage caused by cavitation. Vibration and noise of water conservancy equipment caused by cavitation. [0003] Most of the cavitation experiments on the surface of hydraulic machinery blades are mainly based on the study of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/66F04D29/68G06F17/50
CPCF04D29/669F04D29/688G06F30/17G06F30/20G06F2111/10G06F2119/06
Inventor 王巍王晓放侯腾飞卢盛鹏焦建雄
Owner DALIAN UNIV OF TECH
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