Model stage of pipeline compressor having flow coefficient of 0.02 and impeller design method

Abstract

The invention provides a model stage of a pipeline compressor having a flow coefficient of 0.02. The model stage comprises an impeller, a vaneless diffuser, a curve passage and a reflowing machine, wherein the impeller is positioned at the inlet position of the model stage; the vaneless diffuser is arranged at the outlet of the impeller; the reflowing machine is positioned at the outlet position of the model stage; the vaneless diffuser communicates with the reflowing machine through the curve passage; the machine mach number Mu2 of the model stage is equal to 0.35 to 0.65, the design point flow coefficient Phi1 is equal to 0.02, the design point energy head coefficient Tau is equal to 0.53, the polytropic efficiency Etapcl at the design flow coefficient working condition under each mach number is equal to 0.82 to 0.85, and the applied flow range is 60% to 150% of a design point. The invention also provides a design method of the impeller of the model stage. The model stage provided by the invention is high in efficiency, high in energy head coefficient, large in hub ratio and small in span; by adopting the model stage, a light-medium compressor can have relatively high running efficiency and relatively wide working condition range, and meanwhile, the working rotating speed of a rotor can be reduced, the span of a bearing can be shortened, and the stability of the rotor can be 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 0.02. 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 lower ...

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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 flow coefficient 0.02 pipeline compressor model stage 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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