Method and structure for reducing wall surface friction loss of air collecting chamber of compressed air energy storage turbine

Abstract

The invention discloses a method and a structure for reducing wall surface friction loss of an air collecting chamber of a compressed air energy storage turbine. With the method, the air collecting chamber of the compressed air energy storage turbine has a wall surface with local low roughness. The method specifically comprises the following steps: determining wall surface regions with high flow velocity and high friction force distribution of the air collecting chamber in an experimental measurement or numerical simulation analysis manner, and then performing refined treatment on the regionsto reduce roughness so as to reduce wall surface friction loss of the regions; and determining the roughness of other wall surfaces which are complex in geometric curved surfaces, serious in interference and not easy to machine according to actual machining conditions and cost requirements. The air collecting chamber structurally comprises a spiral volute, an axisymmetric cavity, an annular cavityand the like. With such a scheme, the method and the structure can be applied to the fields of aerospace, transportation, electric power and the like. The method and the structure effectively reducethe machining difficulty and cost of the air collecting chamber, allows the friction loss of pneumatic wall surfaces to be obviously reduced and the pneumatic efficiency of the turbine to be improved,and improves the energy utilization rate of the turbine.

Description

technical field [0001] The invention belongs to the technical field of compressed air energy storage, and relates to a compressed air energy storage turbine air collection chamber, in particular to a method and structure for reducing friction loss on the wall surface of a compressed air energy storage turbine air collection chamber. The compressed air energy storage turbine plenum has local low-roughness walls. Background technique [0002] In recent years, compressed air energy storage systems have been widely used in the regulation of power grid "peak shaving and valley filling" and the utilization of renewable energy. The turbine used in the compressed air energy storage system needs to operate with high efficiency under the condition of high expansion ratio and large flow. At the same time, the turbine used in the compressed air energy storage system should also have the characteristics of small footprint, low processing cost, and low processing difficulty to meet the l...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems of the existing compressed air energy storage turbine air collection chamber, such as low machining precision, difficult surface processing, limited cost, and high wall friction loss, the present invention provides a method for reducing the wall friction of the compressed air energy storage turbine air collection chamber. The method of loss and the compressed air energy storage turbine plenum structure with local low-roughness wall surface obtained by using the method, the compressed air energy storage turbine plenum chamber formed by the method proposed by the present invention has a local low-roughness wall surface, for The inlet area of ​​the turbine air collection chamber has high flow rate characteristics and is easy to process on the wall area, and the roughness is reduced to reduce the wall friction loss in this area. The rest of the geometric surface is complex, and the interference is serious, and the wall surface that is not easy to process is rough The degree is determined according to the actual processing conditions and cost requirements; the turbine type involves axial flow, centripetal, mixed flow and other structures, and the structure of the gas collection chamber can be a spiral volute, an axisymmetric cavity, an annular cavity, etc., the technology It solves the problem of high roughness of the wall surface of the compressed air energy storage turbine air collection chamber and large aerodynamic friction loss, meets the needs of efficient operation of the compressed air energy storage turbine, further improves the energy conversion efficiency of the compressed air energy storage system, and is convenient for processing , low cost and other characteristics, it can be used in many fields such as aerospace, transportation, electric power, etc., and has broad application prospects

Images