Blade element-momentum theory-based method for computing uneven stressed load of actuating disc

A technology of uniform force and calculation method, applied in the direction of calculation, electrical digital data processing, special data processing application, etc., can solve the problems of large rotating coverage area, high calculation accuracy, and the impossibility of completely consistent blade manufacturing and installation errors.

Active Publication Date: 2013-07-17
北京能高普康测控技术有限公司
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  • Abstract
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Problems solved by technology

[0004] 1. The existing method can only solve the relevant load calculation under the condition that the fluid evenly passes through the actuating disc, but in the actual production process, especially for the actuating discs such as high-power wind turbines, it is difficult to ensure that the actuating disc has a large rotating coverage area. The fluid passing through the disk is completely uniform;
[0005] 2. The existing method assumes that the dimensions and specifications of the blades in the actuating disk are completely consistent during the solution process, but the blades in the actuating disk in the actual production process cannot be completely consistent due to manufacturing and installation errors;
[0006] 3. The existing method requires that the pitching angles of the blades in the actuating disk a...

Method used

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  • Blade element-momentum theory-based method for computing uneven stressed load of actuating disc
  • Blade element-momentum theory-based method for computing uneven stressed load of actuating disc
  • Blade element-momentum theory-based method for computing uneven stressed load of actuating disc

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Embodiment Construction

[0060] Axial induction factor corresponding to leaf element sweep annulus in the actuating disk and radial inducer The solution of can use iterative method, the specific steps are as follows:

[0061] Step 1: Set initial value, Generally, a small value and an iteration termination condition are acceptable is a very small positive real number;

[0062] Step 2: Calculating the corresponding th The angle between the synthetic wind speed on the blade element of the strip blade and the rotation plane of the actuating disk is calculated as follows:

[0063] Step 3: Calculate the corresponding first element in the actuating disc element sweep circle element angle of attack ,in is the pitch angle of the blade element corresponding to the blade;

[0064] Step 4: Angle of attack by leaf element , find the lift coefficient of the blade element according to its airfoil look-up table ,OK and the pitching moment coefficient ;

[0065] Step 5: Calculate the norma...

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Abstract

The invention discloses a blade element-momentum theory-based method for computing the uneven stressed load of an actuating disc. In order to overcome the defects that the conventional blade element-momentum theory method cannot effectively solve the related load calculation of the actuating disc when a fluid unevenly flows through the plane of the actuating disc and blade specifications and pitch angles in the actuating disc are different at the same time, the invention provides a quick analytic solution method expanded based on the traditional blade element-momentum theory, and provides a specific analytic solution formula, and specific iteration solution methods and steps for key variables, namely an axial inducing factor and a radial inducing factor. Compared with the common finite element solution method at present, the blade element-momentum theory-based method can greatly reduce the data solving requirement and the calculated amount, and is particularly suitable for the related calculation of the airload of a wind wheel of a megawatt variable speed variable propeller fan.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics, and relates to a method for calculating the uneven force load of an actuating disc based on the momentum-blade element theory. Background technique [0002] The actuating disk is a device that realizes the conversion between the kinetic energy of the fluid and the mechanical energy of the actuating disk. Common actuating discs include wind rotors of wind turbines, propellers of aircraft and ships, etc.; [0003] The momentum-blade element theory is currently the most commonly used method to solve the load on the actuating disk, but the current solution method has the following problems in practical application: [0004] 1. The existing method can only solve the relevant load calculation under the condition that the fluid evenly passes through the actuating disc, but in the actual production process, especially for the actuating discs such as high-power wind turbines, it is difficult to e...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 贾利民雷涛刘展
Owner 北京能高普康测控技术有限公司
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