System and method for measuring plume multi-component space distribution in vacuum low-temperature environment

Abstract

The invention discloses a system and method for measuring plume multi-component space distribution in vacuum low-temperature environment. A quadrupole mass spectrometer is adopted as a core instrument for measuring plume components of a motor, and the mass spectrometer is connected into a vacuum chamber through a drainage pipeline; a plume component probe is mounted at the other end of the drainage pipeline; the plume component probe is mounted on a three-dimensional moving mechanism through a switching piece; and the measurement of plume space components of the motor is achieved under the traction of the three-dimensional moving mechanism. In the system, control reformation and temperature control reformation are performed on a driving motor of the three-dimensional moving mechanism so as to enable three-dimensional moving mechanism to work in the vacuum low-temperature environment, and sealing treatment is performed on the terminals of various circuits so as to effectively prevent a Barson breakdown effect; meanwhile, temperature control is performed on the drainage pipeline. The system and the method have the advantages of achieving one-time measurement of plume multi-component space distribution of the motor in the vacuum low-temperature environment, being economical and simple, and ensuring accurate and visual data and convenient data post-processing.

Description

technical field [0001] The invention relates to a measurement system and measurement technology suitable for measuring rocket engine plume components and their spatial distribution in a vacuum low-temperature environment, belonging to the technical field of vacuum plume pollution effect measurement, in particular to a method for measuring plume components in a vacuum ultra-low temperature environment Components of rocket engine plumes, providing measurement devices and technical solutions for the spatial distribution of plume components. Background technique [0002] The different components of the vacuum plume have different diffusion properties in space, so the components that cause the orientation of the plume or the backflow contamination are also different. The analysis of rocket engine plume components is of great significance for evaluating the sources and components of plume pollution, which directly affects the service life of spacecraft. The molecular model of mul...

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Problems solved by technology

[0004] (1) PLIF test equipment is bulky and expensive, and belongs to the category of optical instruments. Therefore, it needs to be placed at a height of 2.5m outside the observation window of a large vacuum chamber (Φ5m×12m), and the requirements for optical stability and anti-vibration are relatively high;

[0005] (2) PLIF's laser has strict requirements on the observation window glass, its wavelength is ultraviolet light, and it has high requirements on light transmittance. In addition, the laser needs reflectors to guide light in the cabin. 1. The lenses used in low temperature environment are difficult to obtain abroad; in addition, when the engine is ignited, the lenses are likely to be polluted, resulting in a decrease in the reflectivity of the lenses, an increase in energy absorption, and even being burned by the laser. Therefore, the anti-pollution and low-temperature protection of the lenses The implementation of protective measures is more difficult;

[0006] (3) The acquisition camera of PLIF is also relatively demanding, limited to the corresponding band, and expensive; in addition, the principle of PLIF is to excite different component groups to emit fluorescence, and the measured signal is an image signal, the data processing is complicated, and independent calibration is required

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