Method for designing flow coefficient 0.0242 pipeline compressor model grade and impeller

Abstract

The invention provides a flow coefficient 0.0242 pipeline compressor model grade which comprises an impeller, a vaneless diffuser, a curve and a return channel, wherein the impeller is positioned in the inlet of the model grade; the vaneless diffuser is arranged at the outlet of the impeller; the return channel is positioned at the outlet of the model grade; the vaneless diffuser is communicated with the return channel via the curve; the machine mach number of the model grade is Mu2=0.35 to 0.65; the design point flow coefficient of the model grade is Phi1=0.0242; the design point energy head coefficient of the model grade is tau=0.585; the polytropic efficiency of different mach numbers under design flow coefficient working conditions is eta pcl=0.819 to 0.825; the flow range of an application is 60 to 150% that of design points. The invention further provides a method for designing a model grade impeller. The model grade 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 grade, a light medium compressor can be relatively high in operation efficiency and relatively wide in working condition range, meanwhile the working rotation speed of a rotor can be reduced, the span of a bearing can be reduced, 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 design method of a pipeline compressor model stage with a flow coefficient of 0.0242 and an impeller. Background technique [0002] The pipeline compressor is the key equipment of the national key project of the West-East Gas Pipeline. In its research and development process, the model-level design is very important, and the research and development of new products depends on the corresponding model-level. [0003] The existing pipeline model stage has shortcomings such as small hub ratio, large axial span, low efficiency, etc. Therefore, in the process of product design, the shaft diameter and shaft length are small, 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 than similar foreign p...

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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 0.0242 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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