Propeller modeling method and system based on large propeller disc load working condition

Abstract

The invention relates to a propeller modeling method and system based on a large-propeller-disc load working condition. The method comprises the following steps: determining the number of blades and the radius of the propeller according to design parameters determined by working conditions of the propeller, and determining an airfoil profile of a section; determining the induced pitch of the r section; determining the optimal circulation distribution of the position of a propeller hub and the limited number of blades according to the induced pitch; determining the circumferential induced velocity of each station according to the optimal circular rector distribution and the number of the blades; determining the geometric inflow angle of each station according to the incoming flow velocity and the induced pitch; determining the initial chord length of each station according to the relative incoming flow velocity and the optimal circulation distribution of each station determined by the parameters; the corresponding favorable incidence angle and lift coefficient under the Reynolds number and Mach number of each station airfoil; and carrying out propeller three-dimensional modeling according to the actual chord length determined by the wing and lift coefficient of the cross section, the geometric inflow angle of each station and the pitch angle of each station determined by the favorable angle of attack. According to the method, the design precision problem of the large-disc load propeller is effectively solved.

Description

technical field [0001] The invention relates to the field of propeller design, in particular to a propeller modeling method and system based on a large propeller disc load condition. Background technique [0002] The propeller is a device that can turn the power of the engine into pulling force. Because of its high efficiency, low unit fuel consumption rate and safety, it is widely used in the power system of various aviation aircraft and ships, and is an important part of the power system. The main goal of propeller design is high efficiency. According to the given flight state and the demand for pulling force or power, a high-efficiency propeller shape that meets the requirements is designed. [0003] There are two main propeller design methods currently developed. One is based on computational fluid dynamics, which can adapt to complex flow fields and has high precision, but is limited by the development of computer technology. Effectively provide design solutions. Anot...

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Problems solved by technology

[0003] There are two main propeller design methods currently developed. One is based on computational fluid dynamics, which can adapt to complex flow fields and has high precision, but is limited by the development of computer technology. Effectively provide design solutions

Another fast propeller calculation method based on some assumptions, such as propeller momentum theory, airfoil theory, and vortex theory, can be used for fast propeller design, but it is designed to simplify the relative relationship between speeds , the assumption of small paddle disk load is introduced, resulting in low design accuracy under the working condition of large paddle disk load. After the preliminary design scheme is given, continuous iterative optimization is required to achieve the design tension, which prolongs the design cycle

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