A system and method for measuring the spatial distribution of multiple components of a plume in a vacuum and low temperature environment

Abstract

The invention discloses a plume multi-component spatial distribution measurement system and method in a vacuum low-temperature environment. A quadrupole mass spectrometer is used as a core instrument for measuring engine plume components. The mass spectrometer is connected to a vacuum chamber through a drainage pipeline; drainage A plume composition probe is installed at the other end of the pipeline; the plume composition probe is installed on the three-dimensional moving mechanism through an adapter; the measurement of the engine plume space components is realized under the traction of the three-dimensional moving mechanism. In the present invention, the drive motor of the three-dimensional moving mechanism is also modified by control and temperature control, so that the three-dimensional moving mechanism can work in a vacuum and low temperature environment, and the terminals of each line are sealed to effectively prevent Bassen breakdown effect; at the same time, the temperature control of the drainage pipeline was carried out. The invention has the advantages of realizing one-time measurement of multi-component spatial distribution of engine plume under vacuum and low temperature environment; simple economy, accurate and intuitive data, and convenient post-processing of data.

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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