Development of gas dynamic linear systems for setting low pressures
DOI:
https://doi.org/10.15587/1729-4061.2016.75231Keywords:
pressure reproduction, capillary, combiner and divider of flows, linear divider of pressuresAbstract
The results of research into the schemes of serial connection of capillaries – pressure dividers, both two and multicapillary, were presented, with a linear dependency of change in interthrottle pressures on supply pressure. Based on the analysis of the results, the schemes for multirange pressure setting devices are built – a cascade connection of dividers and with binary ramification of pressure dividers.
For each of these schemes, the corresponding setting of dimensions of passable capillary channels can set such pressure drops in capillaries, at which the division pressure coefficients will vary by several orders of magnitude and remain constant. The designed schemes provide one direction and proportionality of all interthrottle pressures (drops) of a scheme when changing the input supply pressure, but the scheme with binary branches of dividers enables setting the drops of pressures at the level of pascal particles.
The built fourdecade device for setting the drops of pressures was explored by the obtained mathematical models under the action of impact factors (change in supply pressures of the setting device, temperature of throttled gas) on the coefficients of division. It was found that the influence of pressure changes in the designed scheme is practically absent while the temperature change of the gas flow by ±5 K does not exceed 0,2 %.
Application of the tools of pressure reproduction, based on the designed schemes, opens up the prospect of building high precision devices for onestage preparation of complex gas mixtures with microconcentrations of components, the devices for setting low and microrates of gases, as well as for testing the tools for measuring pressures.References
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