Method for evaluating vacuum plume effect on basis of mutual coupling of experiment and simulation

Abstract

The invention provides a method for evaluating vacuum plume effect on basis of mutual coupling of experiment and simulation and aims to quickly and accurately evaluating the vacuum plume effect in rocket engines. The method includes: performing simulation aided experimental design, to be specific, performing initial simulation to determine typical experimental conditions and key measurement parameters; confirming experimental effectiveness, to be specific, comparing experimental data of an experimental process with initial simulation results, and judging the effectiveness; confirming method effectiveness, to be specific, after confirming experimental effectiveness, subjecting a simulation method to verification and correction to allow sufficient precision; computing popularization of the simulation method, to be specific, subjecting all conditions of a plume effect task to be analyzed to simulation computation by the simulation method verified. The method has the advantages that various specific analytical problems about the engine vacuum plume effect can be studied and evaluated quickly, efficiently and accurately, reasonableness of experimental design can be effectively guaranteed, fewer experiment times are required, and experiment cost is lowered.

Description

technical field [0001] The invention belongs to the field of aerospace propulsion systems and vacuum science and technology. The invention relates to a vacuum plume effect evaluation method based on mutual coupling of experiments and simulations, which is mainly used to quickly and accurately evaluate the vacuum plume effect of rocket engines. Background technique [0002] When the attitude and orbit control engine on the spacecraft is working, the jet expands to the external vacuum environment to form a vacuum plume. The vacuum plume will have adverse effects on the spacecraft, such as plume aerodynamic force, aerodynamic heat, and pollution, hindering the normal operation of the spacecraft, and even leading to mission failure in severe cases. At present, the research on the vacuum plume effect of the engine mainly relies on two methods: experiment and simulation. [0003] To carry out the experimental research of vacuum plume effect, it is necessary to have an ultra-high ...

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Problems solved by technology

Therefore, the vacuum plume experiment consumes a lot of cryogenic medium, the experiment is very expensive, and is not suitable for large-scale implementation. Effective experimental data must be obtained in limited experimental conditions, and repeated experiments are not allowed.

At the same time, due to the complexity of the vacuum plume flow and the measurement in the vacuum environment, very high requirements are put forward for the experimental design.

Moreover, it is very difficult to judge the validity of the experimental data after the experiment is completed.

[0004] The difficulty in carrying out vacuum plume simulation research is that vacuum plume flow is a flow problem that includes both continuous flow and rarefied flow mechanisms, the flow equation is complex, and the plume and surface interaction model is not perfect.

At present, the direct simulation Monte Carlo method, which is widely used in the study of rarefied flow, has a series of problems such as the difficulty in selecting the surface action model and the difficulty in determining the model parameters when it is applied to the study of the vacuum plume effect. sex to be verified

[0005] In the past, there were also plans to use the simulation method verified by the experimental results to further analyze the plume effect, but the experiment and simulation were carried out separately, and there were still problems such as whether the validity of the experimental results could be guaranteed, and whether the verification of the simulation method was sufficient.

[0006] In summary, the current two main methods for studying engine vacuum plume effects have their own problems, and the simple combination also has great defects

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