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A flow field analysis method and system for a rotating aircraft

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

Active Publication Date: 2021-01-05
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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  • A flow field analysis method and system for a rotating aircraft
  • A flow field analysis method and system for a rotating aircraft
  • A flow field analysis method and system for a rotating aircraft

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0055] According to a method for analyzing the flow field of a rotary aircraft provided by the present invention, it includes: figure 1 as shown,

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

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

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

Embodiment 2

[0097] Embodiment 2 is a modified example of Embodiment 1.

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

[0099] Rotary aircraft include: rotary disc aircraft and rotary flapping wing aircraft, etc.

Embodiment 3

[0101] Embodiment 3 is a variation of embodiment 1

[0102] In Embodiment 3, the aerodynamic theorems include the Kutta-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, in particular to a flow field analysis method and system for a rotary aircraft. Background technique [0002] For a rotating aircraft that rotates continuously around its own body axis, the Magnus effect caused by the rotation will have an important impact on the flight quality, and in severe cases it will lead to the failure of the flight test. It is difficult to fully expose these flight risks due to the limitation of prediction means during ground simulation. In order to understand this problem from the mechanism level and completely solve this problem from the design level, it is necessary to fully analyze the flow field of the rotary aircraft. [0003] Generally, the flow field analysis can be carried out back and forth along the three links of flow field details (such as: vortex, streamline and pressure distribution, etc.) - component aerodynamic force - overall aerodynamic forc...

Claims

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Application Information

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Patent Type & Authority Patents(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