Basic throttling schemes of gas mixture synthesis systems

Gas dynamic synthesizers (GDS) are one of the most promising means of preparing complex mixtures of given composition, in particular for checking the gas analysis equipment. This is caused by both versatility (the ability to synthesize a wide range of mixtures) of GDS and their potentially high precision of setting and maintaining concentrations of the components of the synthesized mixtures. Providing high metrological and performance characteristics of synthesizers is possible due to the optimal combination of basic throttling schemes in the developed principal schemes of GDS. Information on the throttling schemes that can be used in GDS - connection by the scheme of flow summarizer, flow divider, parallel and sequential, as well as combined connection of pressure and flow dividers was presented in the paper. The mathematical description of basic throttling schemes provides efficient modeling of the developed gas-dynamic devices, including GDS was given. An example of using the studied basic connections of throttles is developing the principal scheme of GDS of gas mixtures with microconcentrations of components. In the synthesizer, due to a combination of features of the flow summarizer with packages of line dosing capillaries, fixed in channels and cascade connection of line pressure dividers for setting and maintaining the pressure drops in the dosing capillaries, preparing complex gas mixtures with microconcentrations of components at the same stage (without the loss of pure components and intermediate gas mixtures) and accuracy of maintaining the given concentration of components, higher than in the known synthesis means was provided.