Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Thermochemical unbalanced multistage gas model adaptive algorithm

A non-equilibrium, thermochemical technology, applied in the field of aerodynamics, which can solve the problems of rigidity, non-convergence, low efficiency, etc. with a large amount of calculation, and achieves the effect of good calculation stability, reduction of iteration steps, and consideration of efficiency and accuracy.

Active Publication Date: 2021-06-15
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have not completely solved the problems of "large amount of calculation" and "solution of rigidity" in thermochemical non-equilibrium flow simulation. In the actual application process, problems such as "low efficiency", "non-convergence" and "divergence" often occur

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thermochemical unbalanced multistage gas model adaptive algorithm
  • Thermochemical unbalanced multistage gas model adaptive algorithm
  • Thermochemical unbalanced multistage gas model adaptive algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1: Hypersonic reentry flow simulation of the OREX return device. Calculation model and flight test conditions reference "Yukimitsu Y., Minako Y., CFD and FEM Coupling Analysis of OREX Aerothermodynamic Flight Data, AIAA 95-2087, 29th AIAA ThermophysicsConference, June 19-22, 1995 / San Diego, CALIFORNIA, 1995: 1-14". The calculation and simulation state is that the flight altitude is 59.6km, the incoming flow velocity is 5561.6m / s, the incoming flow temperature is 248.12K, and the wall temperature is 1519K. The numerical simulation adopts Park chemical model, AUSMDV format and Minmod limiter are selected for the convective flux, the number of CFL is 10, and the wall condition is isothermal non-catalytic wall.

[0061] Such as figure 2 As shown, based on Example 1, the calculation residual comparison between the method of the present invention and the existing method is provided, and the abscissa represents the calculation time (t wall ) in seconds (s), N 2 is...

Embodiment 2

[0062] Embodiment 2: HEG shock wave wind tunnel cylinder model experiment flow simulation. References for computational models and experimental conditions "Hannemann K., High Enthalpy Flows in the HEG Shock Tunnel: Experiment and Numerical Rebuilding, AIAA 2003-0978, 41st Aerospace Sciences Meeting and Exhibit 6-9 January 2003, Reno, Nevada, 2003:1-18 ". The numerical simulation adopts Dunn-Kang chemical model, AUSMDV format and Minmod limiter are selected for the convective flux, the number of CFL is 10, and the wall condition is an isothermal non-catalytic wall (wall temperature 300K).

[0063] Such as image 3 As shown, based on example two, the calculation residual comparison between the method of the present invention and the existing method is given, the abscissa represents the number of iteration steps (without unit), and the ordinate represents the average calculation residual (without unit), Tv (K ) is the vibration temperature. The results show that the method of ...

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

No PUM Login to View More

Abstract

The invention discloses a thermochemical unbalanced multistage gas model adaptive algorithm which is mainly used for a numerical simulation process of hypersonic thermochemical unbalanced flow. According to the algorithm, on the basis of thermochemical unbalance characteristics such as thermodynamic modal excitation, dissociation / ionization of high-temperature gas, a segmented gradual approximation simulation strategy from simple to complex is adopted from a physical mechanism, and evolution and step-by-step flow simulation of a calculation gas model are automatically completed according to criteria such as pressure, dissociation degree, temperature and ionization degree; and a self-adaptive simulation process of hypersonic thermochemical unbalanced flow is realized. The algorithm is suitable for various calculation media such as the earth atmosphere, the Mars atmosphere and high-temperature fuel gas, the application range is wide, the calculation stability is good, and the convergence speed can be increased and the calculation efficiency can be greatly improved on the premise that the calculation accuracy is guaranteed.

Description

technical field [0001] The invention relates to the field of aerodynamics, in particular to a numerical calculation method for hypersonic thermochemical non-equilibrium flow. Background technique [0002] Hypersonic vehicles fly in the atmosphere. If the flight speed is high (Mach number above 10), high temperature of thousands to tens of thousands of Kelvin will be generated after the shock wave. Complex physical and chemical phenomena will occur in the high-temperature flow field. Dissociation, recombination, exchange, ionization, multi-level ionization and other chemical reactions, gas molecule translational kinetic energy, vibration energy, electronic energy / electronic binding energy and other thermodynamic mode excitations, forming a mixed multi-component dissociation-ionization-thermodynamically excited gas cloud, And expand backward along the flow direction, forming a sheath around the aircraft, this phenomenon is called the hot gas effect. Since the high temperature...

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
no application Login to View More
IPC IPC(8): G06F30/20G06F17/12G06F113/08G06F111/10G06F119/14
CPCG06F17/12G06F30/20G06F2111/10G06F2113/08G06F2119/14
Inventor 李鹏丁明松陈坚强赵钟董维中何先耀江涛梅杰
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com