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Multiple-searching technology based three-dimensional wave-rider rapid design method

A design method and waverider technology, applied in the field of rapid design of three-dimensional waveriders based on multiple search technology, can solve the problems of reducing design efficiency, time-consuming, and large flow field data, so as to improve tracking efficiency and expand design. The effect of space and stability

Active Publication Date: 2015-11-18
CHINA ACAD OF AEROSPACE AERODYNAMICS
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AI Technical Summary

Problems solved by technology

At the same time, the flow field data obtained by using the CFD method is very huge, and the number of grids ranges from hundreds of thousands to nearly tens of millions. At this time, it is time-consuming to use the streamline tracing method to search and find the position and information of any point inside the flow field. Huge work, greatly reducing design efficiency

Method used

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Embodiment 1

[0033] First, taking the blunt elliptical cone as an example, the shock wave assembly method is used to calculate the flow field, and then the waverider is designed. The number of grids in the flow field calculated by using the shock wave assembly method is about 1.1 million, and the grid distribution is shown in figure 1 , where the outermost mesh is the shock surface. Such as figure 2 As shown, a curve in space is used as the FCT, and 6 control points are selected on the curve to control the FCT curve. The coordinates of the 6 control points are shown in Table 1, and the two-dimensional multi-division combined with the surface spline method is used. Projected onto the shock surface as the leading edge line of the waverider.

[0034] Using the octree as the data structure, multiple search techniques are used to trace the streamline to generate the lower surface of the waverider. First use an area that can include all the data points, then store the data points in the area...

Embodiment 2

[0039] Firstly, taking the conical flow with angle of attack as an example, the shock wave assembly method is used to calculate the flow field, and then the waverider design is carried out. The number of grids in the flow field calculated by using the shock wave assembly method is about 1.23 million, and the grid distribution is shown in Figure 4 , where the outermost mesh is the shock surface. Five control points are selected to control the FCT curve. The coordinates of the control points are shown in Table 2, and they are projected onto the shock wave surface as the leading edge of the waverider using the two-dimensional multi-division combined with the surface spline method.

[0040] Using the octree as the data structure, multiple search techniques are used to trace the streamline to generate the lower surface of the waverider. First use an area that can include all the data points, then store the data points in the area, if the number of points exceeds the preset 5000, ...

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Abstract

The present invention discloses a multiple-searching technology based three-dimensional wave-rider rapid design method. The multiple-searching technology based three-dimensional wave-rider rapid design method comprises the following steps of: (1) determining a three-dimensional flow field; (2) determining a shock wave curved surface, and fitting a leading edge curve; and (3) performing streamline tracing by adopting a multiple-searching technology to generate a wave-rider lower surface, and automatically acquiring a wave-rider outline with a given length by performing scaling adjustment on a shock wave outlet shape line at the same time. The multiple-searching technology based three-dimensional wave-rider rapid design method has the following beneficial effects: (1) the condition that the existing design method is limited to a two-dimensional or quasi two-dimensional flow field is broken through, and a shock fitting method is used for accurately computing the three-dimensional flow field and accurately distinguishing the shock wave curved surface; (2) in order to solve the problem of mass data point addressing in a three-dimensional wave-rider design, data are divided into multiple subareas by use of an octree, and the point addressing efficiency strength can be greatly improved by combining a virtual boundary method; and (3) the three-dimensional flow field based on the shock fitting method expands the design space, and is combined with a multiple-searching based streamline tracing method to greatly improve the tracing efficiency and meet rapid design requirements of aircraft layout.

Description

technical field [0001] The invention belongs to the technical field of aircraft design, in particular to a rapid design method for a three-dimensional waverider based on multiple search techniques. Background technique [0002] Hypersonic aircraft is an important weapon system to deal with future wars and break through missile defense systems. It has extremely high-speed long-range strike and defense penetration capabilities, and can achieve "global instant arrival". It has become a popular weapon system that countries around the world are competing to develop and develop. Has extremely important military value. No matter what kind of near-space hypersonic vehicle, high speed, high maneuverability and long range are its main development goals. [0003] The layout of the waverider stands out from the low-drag shape due to its high lift-to-drag ratio, and has become one of the most widely studied aerodynamic shapes of hypersonic vehicles. Boeing, Nuoenlop, etc. in the United ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B64F5/00
Inventor 刘传振陈冰雁纪楚群
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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