Special configuration blade for improving surface cavitation flow characteristics

A technology of flow characteristics and surface cavitation, which is applied to components of pumping devices for elastic fluids, engine components, climate sustainability, etc., can solve product and design method blanks, and special configuration blades have no impact on performance Sufficient knowledge and other issues

Active Publication Date: 2018-12-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by designing blades with special configurations of hydraulic machinery to regulate the occurrence and development of cavitation, there are few researches at home and abroad.
At present, under the condition of cavitation, the use of special configuration blades has not yet fully understood the impact on the operation and performance of hydraulic machinery, and related products and design methods are still blank

Method used

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  • Special configuration blade for improving surface cavitation flow characteristics

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Embodiment Construction

[0017] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0018] Such as figure 1 As shown, the present invention includes a blade with a special configuration to improve surface cavitation flow characteristics, mainly consisting of a blade 1 and a pit 2;

[0019] (1) According to the design requirements, the original hydraulic machinery blade 1 structure is NACA66 (MOD) airfoil, the angle of attack of the incoming flow of the blade is 8°, the incoming flow velocity is 7.832m / s, the incoming flow pressure is 101.325kPa, and the temperature is 20°C , the working medium is water, and the cavitation number at this time is 0.91.

[0020] (2) For the NACA66 (MOD) airfoil with no pits on the blade surface in the design, carry out numerical analysis of the cavitation flow field through physical and mathematical modeling, and obtain the specific state of cavitation occur...

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Abstract

The invention discloses a special configuration blade for improving surface cavitation flow characteristic, and belongs to the technical field of design and manufacturing of hydraulic machinery. According to the design, cavitation is inhibited through directly using a pit of a suction surface of the blade to influence jet flow and pressure distribution, so that a configuration which meets cavitation inhibition requirements and does not influence hydrodynamic performance of the blade is formed. According to the special configuration blade, the cavitation generation can be delayed, the jet flowcan be inhibited, so that the effect of reducing the influence of the cavitation on the hydraulic mechanical performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic machinery design and manufacture, and relates to a blade with a special configuration for improving surface cavitation flow characteristics. Background technique [0002] Cavitation refers to the mutual conversion between liquid phase and gas phase in the working medium or on the solid surface, and is often accompanied by vibration and noise. Hydraulic machinery will inevitably operate in a cavitation state, and severe cavitation will cause pressure pulsation, vibration, noise, erosion, and even serious damage to hydraulic machinery. In order to minimize the harm of this phenomenon to hydraulic equipment, the current design of hydraulic machinery blades is usually based on active control and passive control methods to delay the occurrence and development of cavitation, so that cavitation can be effectively improved and suppressed. [0003] In the active control method of suppressing the occurre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/18F04D29/66F03B3/12F03B11/04
CPCF03B3/121F03B11/04F04D29/18F04D29/669Y02E10/20Y02P70/50
Inventor 王巍王晓放谢蓉赵广焦建雄卢盛鹏唐滔
Owner DALIAN UNIV OF TECH
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