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Dynamic and static cavity flow micro-groove drag reduction design method

A design method and micro-groove technology, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as lack of curve design methods

Pending Publication Date: 2020-09-29
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in order to achieve a good drag reduction effect, the grooves on the wall surface of the rotor should be designed in a curved shape, but the curved design method is relatively lacking.

Method used

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  • Dynamic and static cavity flow micro-groove drag reduction design method
  • Dynamic and static cavity flow micro-groove drag reduction design method
  • Dynamic and static cavity flow micro-groove drag reduction design method

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Embodiment Construction

[0036] The present invention will be further described in detail below in combination with specific embodiments.

[0037] A design method for drag reduction design of micro-grooves in dynamic and static chambers, comprising the following steps:

[0038] S1. Micro-groove space profile equation;

[0039] Fluid radial velocity:

[0040]

[0041] C r =1.18 (10 -5 · Re r +2) -0.49 (2)

[0042]

[0043]

[0044]

[0045]

[0046] v r is the fluid radial velocity, and the radial coordinate is its independent variable; C r is the radial velocity coefficient of the rotor; r is the radial coordinate; ω is the angular velocity of the rotor; K is the roll coefficient; z is the axial coordinate; δ r The thickness of the boundary layer of the moving disk; Re r is the Reynolds number; C qr is the radial flow coefficient; Q is the flow rate of the dynamic and static chamber;

[0047] Given the rotor speed ω and flow rate Q; select the boundary layer height coefficie...

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Abstract

The invention relates to a dynamic and static cavity flow micro-groove drag reduction design method. A space molded line equation set of the micro groove is established by considering circumferentialand radial flow of a near-wall area of the movable disc. Firstly, working parameters of a dynamic cavity and a static cavity are given, the equation set is solved through a numerical method, and the space molded line of the micro-groove is obtained. Then, the shape of the cross section of the micro-groove is selected, the height and arc length of the cross section of the micro-groove are designed,and the number of the micro-grooves is selected; and finally, micro-grooves are machined in the movable disc in combination with the space molded lines of the micro-grooves and the geometrical parameters and number of the cross sections of the micro-grooves. According to the invention, the purpose of reducing resistance is achieved by processing the micro-grooves on the movable disc.

Description

technical field [0001] The invention relates to the field of flow drag reduction in dynamic and static chambers of rotating machines, in particular to a design method for drag reduction of flow micro-grooves in dynamic and static chambers. Background technique [0002] The dynamic and static chamber refers to the flow area between the rotating disc and the stationary disc, such as figure 1 As shown, it is not only a classic research object of fluid mechanics, but also an engineering problem that widely exists in rotating machinery in petrochemical, water conservancy and hydropower, ocean engineering, aerospace power, nuclear power equipment and other fields. In most rotating machines, dynamic and static chambers are inevitably formed. The frictional power between the moving disc and the fluid in the cavity belongs to energy loss. Reducing the rotational resistance of the moving disc (that is, reducing the circumferential shear stress of the wall) is the key to realize the en...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/28G06F30/23G06F113/08G06F119/14G06F111/10
CPCG06F30/17G06F30/28G06F30/23G06F2113/08G06F2119/14G06F2111/10
Inventor 顾延东成立
Owner YANGZHOU UNIV
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