Rotary aircraft flow field analysis method and system

An analysis method and analysis system technology, applied in the field of aerodynamic design, to achieve the effect of reducing the number of design iterations, reducing design risks, and shortening the development cycle

Active Publication Date: 2020-09-11
SHANGHAI INST OF ELECTROMECHANICAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the original flow analysis, there is an insurmountable problem: how to select the equivalent state corresponding to the equivalent aerodynamic force

Method used

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  • Rotary aircraft flow field analysis method and system
  • Rotary aircraft flow field analysis method and system
  • Rotary aircraft flow field analysis method and system

Examples

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Embodiment 1

[0055] A flow field analysis method for a rotating aircraft provided in accordance with the present invention includes: figure 1 As shown,

[0056] Equivalent step: Scan the meridian surface along the circumferential direction, and select the meridian surface state whose instantaneous aerodynamic force is consistent with the equivalent aerodynamic force as the equivalent state;

[0057] Specifically, selecting the instantaneous aerodynamic force and the equivalent aerodynamic force in the equivalent step to be consistent with the change law includes: the partial derivative of the instantaneous aerodynamic force with respect to the flight state parameter is equal to or the same sign as the partial derivative of the equivalent aerodynamic force with respect to the flight state parameter; When every point cannot be satisfied, the meridian state with the most satisfied points is selected as the equivalent state;

[0058] The flight state parameters include: Mach number, synthetic angle o...

Embodiment 2

[0097] Example 2 is a variation of Example 1.

[0098] In Embodiment 2, the rotating aircraft is a type of aircraft that rotates around its own body axis. The rotating aircraft is generally a combination of a slender body and a wing surface, and there are antenna components in special cases;

[0099] Rotating aircraft include: rotating saucer-shaped aircraft and rotating flapping-wing aircraft, etc.

Embodiment 3

[0101] Example 3 is a variation of Example 1

[0102] In Embodiment 3, the aerodynamic theorem includes the Kuta-Zhukovsky theorem.

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Abstract

The invention provides a rotary aircraft flow field analysis method and system, and the method comprises: scanning a meridian plane in the circumferential direction, and selecting the meridian plane with the change rule of instantaneous aerodynamic force consistent with the change rule of equivalent aerodynamic force as an equivalent state; analyzing the contribution degree of each part to the overall aerodynamic force; selecting a component with the maximum contribution degree, uniformly selecting a preset integral length along a preset direction, performing pressure integration on the objectplane in each integral length to obtain a small unit aerodynamic force, and forming a distribution rule by all the small unit aerodynamic forces; combining the integral eddy current field in the equivalent state with the dynamic integral eddy current field to obtain the interaction condition of the component eddy system with the maximum contribution degree and other component eddy systems; and according to the eddy current field and the pressure distribution of the component with the maximum contribution degree, carrying out closed-loop analysis on the eddy current field, the surface pressuredistribution, the small unit aerodynamic force distribution and the component aerodynamic force by using the aerodynamic theorem. The equivalent state is consistently selected according to the changerule to reduce the design risk in advance, reduce the design iteration frequency and shorten the development period.

Description

Technical field [0001] The invention relates to the technical field of aerodynamic design, and in particular to a flow field analysis method and system for a rotating aircraft. Background technique [0002] For rotating aircraft that continuously rotate around the axis of their body, the Magnus effect caused by the rotation has an important impact on the flight quality, and in severe cases, the flight test will fail. These flight risks are difficult to fully expose in the ground simulation due to the limited ability of prediction methods. In order to understand this problem from the mechanism level and completely solve it from the design level, it is necessary to fully analyze the flow field of the rotating aircraft. [0003] In general, flow field analysis can be performed back and forth in closed loop analysis along the three links of flow field details (such as vortex, streamline and pressure distribution, etc.)-component aerodynamic force-overall aerodynamic force. Different ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/28G06F113/08G06F119/14
CPCG06F30/15G06F30/28G06F2113/08G06F2119/14Y02T90/00
Inventor 唐海敏田浩张宏俊王波兰鲍然伍彬廖欣傅建明付昊张树海
Owner SHANGHAI INST OF ELECTROMECHANICAL ENG
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