Axial induced velocity calculation method of rotor system inducing flow field based on finite state

A technology of induced velocity and finite state, applied in the field of axial induced velocity calculation, which can solve the problem of difficult to take into account fast calculation and fast convergence at the same time.

Inactive Publication Date: 2018-02-13
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing calculation method is difficult to take into account the requirements of fast c

Method used

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  • Axial induced velocity calculation method of rotor system inducing flow field based on finite state
  • Axial induced velocity calculation method of rotor system inducing flow field based on finite state
  • Axial induced velocity calculation method of rotor system inducing flow field based on finite state

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specific Embodiment approach 1

[0031]Specific implementation mode 1: This implementation mode is based on the calculation method of the axially induced velocity of the induced flow field of the rotor system based on the finite state. The specific process is as follows:

[0032] Step 1. Obtain the test point set in the elliptical coordinate system ν, η, the coordinates below;

[0033] Step 2. Set the maximum harmonic parameter N (the setting range is generally 8-15) according to the accuracy requirements and the actual situation, and solve the corresponding matrix parameters according to the maximum harmonic parameter, and according to the dynamic pressure coefficient of the sinusoidal component Dynamic pressure coefficient of cosine component and the corresponding matrix parameters, combined with equations (4), (5) to solve

[0034] The corresponding matrix parameter is [M c ], [M s ], [D c ], [D s ], [L c ], [L s ];

[0035] where [M c ], [M s ] represents the mass matrix of cosine and sine...

specific Embodiment approach 2

[0041] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in the step one, obtain the test point set above the rotor plane in the ellipse coordinate system ν, η, The coordinates below; the specific process is:

[0042] Taking the center of the rotor as the origin, establish as figure 1 In the Cartesian coordinate system shown, χ represents the wake inclination angle. Use the following formula to convert the coordinates in the Cartesian coordinate system to the coordinates in the elliptical coordinate system

[0043]

[0044]

[0045]

[0046] where r' 2 =x 2 +y 2 +z 2 , r' is the distance between the test point and the origin; x, y, z represent the coordinates of the test point set in the Cartesian coordinate system, ν, η, Represents the coordinates of the test point set in the ellipse coordinate system; where η=0 represents the circular area where the rotor is located.

[0047] Specific embodiment two: the differen...

specific Embodiment approach 3

[0135] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the value range of the maximum harmonic parameter N is generally 8-15.

[0136] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses an axial induced velocity calculation method of a rotor system inducing flow field based on a finite state, and relates to the axial induced velocity calculation method of therotor system inducing flow field. The invention aims to solve the problems that the existing calculation method is hard to pay both attentions to rapid calculation and rapid convergence at the same time. The process includes steps of firstly, acquiring coordinates of inner testing point sets of an upper space of a rotor plane under an ellipse coordinate system; secondly, setting a maximum harmonicparameter, solving corresponding matrix parameters according to the maximum harmonic parameter, and solving formulas as shown in the description according to corresponding coefficients and corresponding matrix parameters; thirdly, solving formulas as shown in the description; fourthly, solving the axial induced velocity of the induced flow field at the upper testing point of the rotor plane; fifthly, calculating the axial induced velocity of the induced flow field at the upper testing point of the rotor plane according to a reconstruction model; sixthly, calculating the axial induced velocityof the induced flow field at the upper testing point of the rotor plane according to optimized reconstruction model. The invention is applied to the field of induced velocity calculation of the rotorsystem.

Description

technical field [0001] The invention relates to a method for calculating the axial induced velocity of the induced flow field of a rotor system. Background technique [0002] With the continuous development of helicopters and large-scale wind power generation equipment, in order to meet the design indicators and requirements of the corresponding systems, and to deeply understand the dynamic characteristics of the system, accurate models have become more and more important. In this type of system, the model and dynamics of the rotor system will undoubtedly play an important role, and one of the keys to accurately calculate the dynamic characteristics of the rotor is to accurately express the air-induced velocity of the rotor disc and its surroundings. Action-reaction relationship. When the rotor is disturbed, the change of the aerodynamic load of the rotor will inevitably cause the change of the induced velocity, and this change will in turn affect the aerodynamic load of th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 费中阳史爽杨宪强关朝旭
Owner HARBIN INST OF TECH
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