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

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...

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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 are completely consistent during the solution process, that is, the blades in the actuating disk are kept in a unified motion. Due to unique control requirements (such as independent pitch control technology for wind turbines), it is difficult to ensure that the pitch angles of the blades in the actuating disk are exactly the same

[0007] In view of the above practical problems, many commercial softwares have introduced finite element calculation and analysis methods to deal with the load calculation of the actuating disc when the fluid passing through the actuating disc is not uniform and the specifications and pitch angles of the blades in the actuating disc are not the same. method, which has high calculation accuracy but a relatively large amount of calculation, and at the same time requires relatively more data

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