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

Abstract

The invention provides a model stage of a pipeline compressor with a flow coefficient of 0.02, including an impeller, a vaneless diffuser, a bend, and a reflux device. The outlet position of the model stage, the vaneless diffuser and the recirculator are connected through a bend; the machine Mach number M of the model stage u2 =0.35~0.65, design point flow coefficient Φ 1 =0.02, the design point energy head coefficient τ=0.53, the variable efficiency η under the design discharge coefficient working condition at each Mach number pcl =0.82~0.85, the applied flow range is 60%‑150% of the design point. A design methodology for the model stage impeller is also provided. The model stage of the present invention has high efficiency, high energy head coefficient, large hub ratio, and small span. Adopting the model stage can make the light medium compressor have higher operating efficiency and a wider range of working conditions, and at the same time can reduce the rotor work. speed, reduce the bearing span, and improve the stability of the rotor.

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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