A Method of Parametrically Constructing 3D Model of Propeller
A 3D model and propeller technology, applied in 3D modeling, image data processing, instruments, etc., can solve the problems of heavy data processing workload, complex calculation of model value point coordinates, heavy workload, etc.
Inactive Publication Date: 2013-12-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
The calculation process of leaf cut surface and stretching contour curve is complicated and the workload is heavy
When describing the geometric shape of the propeller, the predecessors introduced the cylindrical coordinate system on the basis of the rectangular coordinate system to describe the shape of the blade section at the radius of each blade. The calculation of the value point coordinates of each blade section is complicated, and the workload of data processing is large.
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[0036] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0037] figure 1 It is a schematic flow chart of the method of the present invention. according to figure 1 , the concrete steps that realize the present invention are:
[0038] Step 1 Determine the geometric characteristic parameters of the propeller, including: propeller diameter D, number of blades N B , the chord length c(r) at each radius of the blade and the blade angle β(r) at each radius of the blade; the parameters shown in the following table are obtained:
[0039] Table 2 refers to the profile parameters of the two-blade propeller (14″×7″)
[0040] radius r
Airfoil chord c(r)(mm)
Blade angle β(r)(deg)
10mm
20
28.2
20％R
28.4
28.2
30％R
31.3
25.0
40％R
30.4
21.5
50％R
29.2
18.0
60％R
27.3
15.2
70％R
25.0
13.0...
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The invention relates to a method for parametrically constructing a three-dimensional model of a propeller, comprising the following steps: 1, determining the geometric characteristic parameters of the propeller; 2, selecting a reference airfoil, and obtaining an optimized airfoil through linear superposition of the reference airfoil and a disturbance function 3. Calculating the coordinates of blade-arbitrary radius r profile point coordinates; 4. Rotating the profile point points at each radius r of the blade obtained in step 3 around the y-axis for coordinate transformation to generate each radius of other blades Type value point of profile at r. The present invention calculates the type value point coordinates of the blade section shape at each radius of the propeller blade in the rectangular coordinate system, and obtains the type value point coordinates of the blade section shapes at each radius of other blades through the method of coordinate transformation, which improves the design efficiency and reduce design cost.
Description
technical field [0001] The invention relates to a parametric modeling method applied to propellers used in aviation vehicles and ships. Background technique [0002] The propeller design usually adopts the map method or the theoretical calculation method of lift line and lift surface. After completing the design calculation of the propeller, it is necessary to draw the outline drawing of the propeller, especially the stretching profile. Generally, the stretching profile is composed of the stretching profile curve and the shape of the leaf section at several radii (9-10). The calculation process of leaf cut surface and stretching contour curve is complicated and the workload is heavy. When describing the geometric shape of the propeller, the predecessors introduced the cylindrical coordinate system on the basis of the rectangular coordinate system to describe the shape of the blade section at the radius of each blade. The calculation of the value point coordinates of each b...
Claims
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Inventor 刘莉廖炎平许承东贺媛媛王正平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY