Expansion section for plane cascade flow simulation device

Abstract

The invention discloses an expansion section for a plane cascade flow simulation device. The expansion section is of a double-layer taper pipe structure and comprises an inlet flange, an outer taper pipe, an inner taper pipe, a supporting plate and an outlet flange. The inner taper pipe is sleeved with the outer taper pipe, and the outer taper pipe and the inner taper pipe are connected through the supporting plate in a welded mode. An inlet flange is welded to the front end face of the outer taper pipe, and an outlet flange is welded to the rear end face of the outer taper pipe. The taper of the outer taper pipe ranges from 12 degrees to 15 degrees, and the taper of the inner taper pipe ranges from 5 degrees to 8 degrees. The expansion section is simple in structure, the effects of reducing the flow speed and stabilizing incoming flow are effectively achieved, stable and uniform incoming flow is provided for the cascade test section, and the flow field quality and the test accuracy of the cascade test section are improved.

Description

Technical field [0001] The present invention belongs to the field of aerospace engine base research test equipment, and is specifically involved in the expansion segment of the planar blade flow simulation device. Background technique [0002] Air impeller (including fan / compressor and turbine) and gas turbine are key components that maintain thermal cycles and generate thrust, and the pneumatic shape of the rotary / caliper blades determines aerodynamic performance of the air impeller and gas turbine. For high-performance aerospace jet engines and gas turbines, the design methods and flow characteristics of the impeller need to be studied at the impeller (two-dimensional leaf) level. In order to be able to perform the pneumatic characteristics of the vane channel flow pneumatic characteristics under real flight conditions, the ground flow simulation apparatus capable of simulating the parameters such as the number of vane flow in the actual flight is to ensure that it is close...

AI Technical Summary

Problems solved by technology

At present, the expansion section of the plane cascade high-altitude flow simulation device at home and abroad mostly adopts a large expansion angle conical tube structure. This structure often results in poor flow stability and turbulent airflow in the cascade test section due to excessive speed drop, and has a flow field quality. It is difficult to meet the needs of high-precision measurement of aerodynamic characteristics of planar cascade flow simulation

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