Pipeline compressor model stage with flow coefficient being 0.0266 and impeller design method

Abstract

The invention provides a pipeline compressor model stage with the flow coefficient being 0.0266. The pipeline compressor model stage comprises an impeller, a vaneless diffuser, a curve and a backflow device; the impeller is located at the position of an inlet of the model stage, the vaneless diffuser is arranged at an outlet of the impeller, the backflow device is located at the position of an outlet of the model stage, and the vaneless diffuser is communicated with the backflow device through the curve; and the machine mach number Mu2 of the model stage ranges from 0.35 to 0.65, the flow coefficient phi1 of a design point is equal to 0.0266, the energy head coefficient tau of the design point is equal to 0.586, the polytropic efficiency etapcl under the discharge coefficient working condition designed under all mach numbers ranges from 0.83 to 0.833, and the applied flow scope is 60% to 150% that of the design point. The invention further provides a design method of the impeller of the model stage. The model stage is high in efficiency, high in energy head coefficient, large in hub ratio and small in span; by means of the model stage, a light medium compressor can have the high running efficiency and the wide working condition scope; and meanwhile, the working rotating speed of a rotor can be reduced, the bearing span can be decreased, and the stability of the rotor is improved.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a model stage and impeller design method of a pipeline compressor with a flow coefficient of 0.0266. Background technique [0002] The pipeline compressor is the key equipment of the national key project of the West-to-East Gas Pipeline. During its research and development process, the design of the model level is very critical, and the development of new products depends on the corresponding model level. [0003] The existing pipeline model stage has disadvantages such as small wheel-to-hub ratio, large axial span, and low efficiency. Therefore, in the process of product design, the shaft diameter is small and the shaft length is long, and the critical speed of the product, the stability of the rotor, and the stiffness of the shaft, etc. There are big problems in this aspect, which brings great difficulties to product design. In addition, the performance of the unit is lowe...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems existing in the existing pipeline model stage, the purpose of the present invention is to provide a pipeline compressor model stage with a flow coefficient of 0.0266 and its impeller design method, so that the efficiency of the pipeline compressor product unit can be significantly improved, and the power consumption of the unit can be reduced

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