Method for establishing aerodynamic model of turnover flat plate in falling process
A model building, aerodynamic technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as affecting effectiveness, large amount of calculation, and inability to obtain quickly
Active Publication Date: 2021-11-16
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
View PDF2 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
(b) Directly modeling the real shape of the aircraft based on aircraft laws and using engineering algorithms to calculate the aerodynamic force and aerodynamic heat of the aircraft can more accurately simulate the processes of reentry ablation and disintegration, but such methods are computationally intensive and cannot Acquired quickly, affecting the effectiveness of the forecast
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] There are a large number of plate shell structures in the space vehicle, which all become thin plates and enter the atmosphere after their fall. To predict the falling point of such flake-like objects, it is necessary to model the aerodynamic force during its fall, and then bring it into the ballistic dynamics equation to analyze its fall trajectory. Based on this, the present invention takes a typical flat panel as an object, and proposes to establish an aerodynamic model under its typical tumbling motion state during the falling process, for the prediction of its falling trajectory.
[0021] Specifically include the following:
[0022] 1. Decomposition of plate rolling motion and calculation of local angle of attack
[0023] Here, for the sake of simplicity, it is assumed that the fragments are a, b, and w respectively in length, width, and thickness, and satisfy rectangle, such as a spacecraft's solar panels. The flow on a sheet can be simply regarded as a flat p...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for establishing an aerodynamic model of a turnover flat plate in a falling process. The method comprises the following steps: step 1, decomposing the rolling motion of a flat plate; step 2, calculating a local attack angle; step 3, calculating a pressure coefficient under the whole watershed; step 4, calculating an instantaneous lift coefficient and a resistance coefficient under a current nominal attack angle; and 5, establishing an aerodynamic model of the flat plate during tumbling and falling. Compared with the prior art, the method has the positive effects that for a typical flat plate model, the influence of rolling speed components under different attitude angles on a local attack angle when the flat plate model rolls around a long axis is fully considered through speed decomposition, instantaneous pressure distribution and aerodynamic force under the condition are derived, then the corresponding average aerodynamic force and aerodynamic moment are obtained through integration, an aerodynamic force model under the flat plate rolling motion is established, and the method has positive significance in prediction of flat plate falling tracks, analysis of falling points and reduction of ground risks.
Description
technical field [0001] The invention relates to the field of aerodynamics and aerospace technology, in particular to a method for establishing an aerodynamic model of an overturned flat plate in the process of falling. Background technique [0002] After a large spacecraft has been in orbit for many years, in order to avoid the formation of space junk and affect the safety of the active spacecraft, it needs to be de-orbited and re-entered to return to the ground. The entire fall process involves multiple disciplines such as ballistics, aerodynamics / heat, and ablation. , the system complexity is extremely high. These large spacecraft rubbed against the atmosphere during re-entry, and disintegrated under the action of strong aerodynamic heating and aerodynamic force to produce a large number of fragments. Due to the high temperature, some fragments will be completely ablated and melted before reaching the ground, but some fragments still fall to the ground. to the ground. On...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/28G06F113/08G06F119/14
CPCG06F30/15G06F30/28G06F2113/08G06F2119/14Y02T90/00
Inventor 张兆李志辉
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT