Double-flush probe data processing and correcting method used in high-speed flow field

Abstract

The invention provides a double-flush probe data processing and correcting method used in a high-speed flow field. The method comprises the following steps: step 1, establishing models of different electrode radius parameters of a double-flush probe, and correcting a sheath expansion effect of the double-flush probe; and step 2, establishing a Boehmite speed correction relationship under the collision condition, and correcting the Boehmite speed under the collision condition. The double-flush probe data processing and correcting method solves the problem of online measurement of the high-temperature ablation area of the supersonic aircraft, and provides technical support for the national near space high-speed aircraft to detect plasma parameters.

Description

technical field [0001] The field of the invention belongs to the technical field of aerospace detection theory, and in particular relates to a data processing and correction method for double flat-mounted probes under a high-speed flow field. Background technique [0002] After the reentry vehicle enters the atmosphere at high speed, a dense plasma sheath will be formed on the surface of the vehicle due to the heating of the air by the shock wave and the ablation of chemical protective materials, which will interrupt the communication signal, which is the black barrier phenomenon. In order to solve this problem, the present invention designs a double flat-pack probe structure that can make the surface of the measurement electrode consistent with the surface of the aircraft measurement area. The special configuration of the double flat-pack probes successfully solves the problem that the electrostatic probes cannot work normally in some special areas. However, due to the spe...

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Problems solved by technology

However, due to the special configuration of the probe, the sheath expansion effect is prone to occur in low-pressure, non-collision plasma environment diagnosis, resulting in the effective collection area of ​​the double flat-pack probe gradually increasing with the increase of the negative bias of the probe. Large, much larger than the physical collection area

Therefore, the ion collection flow of the probe at this time will be larger than that of no sheath, so that the diagnostic result of the electron density is much greater than the actual density. The collision effect between electrons and neutral particles cannot be ignored. Electrons will lose energy due to collisions, resulting in a smaller number of electrons reaching the probe electrode, thereby underestimating the electron density of the plasma.

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