Pipeline compressor model stage with flow coefficient of 0.0495 and impeller design method

Abstract

The invention provides a pipeline compressor model stage with flow coefficient of 0.0495. The pipeline compressor model stage comprises an impeller, a vaneless diffuser, a bend and a return device. The impeller is located at the position of an inlet of the model stage, and the vaneless diffuser is arranged at an outlet of the impeller. The return device is located at the position of an outlet of the model stage, and the vaneless diffuser communicates with the bend through the return device. The machine Mach number Mu2 of the model stage ranges from 0.35 to 0.65, the flow coefficient theta of a design point is 0.0495, the energy head coefficient tau of the design point is 0.603, the polytropic efficiency eta of all the Mach numbers under the design flow coefficient work conditions ranges from 0.867 to 0.872, and the applied flow range is 60%-150% 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 efficiency, large in hub ratio and small in span, by means of the model stage, a light-medium compressor can have high running efficiency and a wide work condition range, meanwhile the working rotating speed of a rotor can be reduced, the bearing span is shortened, and the rotor stability 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 0.0495. 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 0.0495 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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