Tenon-type turbine blade with five pressure sensing holes on elementary-stage front edge

Abstract

The invention discloses a tenon-type turbine blade with five pressure sensing holes on an elementary-stage front edge. The tenon-type turbine blade comprises the pressure sensing holes, pressure guiding channels, a blade top tenon, a blade root tenon, low-loss bent pipes and pressure guiding pipe connectors, wherein a plurality of rows of the pressure sensing holes are formed on the front edge ofthe blade in the blade height direction; each row is composed of five pressure sensing holes; and the pressure guiding channels are correspondingly connected with the orifices of the pressure sensingholes and the pressure guiding pipe connectors. By the adoption of the tenon-type turbine blade, the total pressure, the static pressure, the deflection angle and the Mach number of airflow at a turbine inlet, at a turbine rotor outlet in the blade height direction, at a plurality of elementary-stage positions, and within a range of the included angle between the incoming flow direction and the front edge + / - 120 degrees can be measured simultaneously; the tenon-type turbine blade is suitable for measuring the distribution of two-dimensional flow field parameters at the rotor outlet in the blade height direction under various working conditions; and the tenon-type turbine blade not only has the aerodynamic performance and strength of a conventional turbine blade and importantly the flow field parameter measurement function, but also has the advantages that no overhanging probe is adopted, the interference in a measured flow field is avoided, the own aerodynamic performance of the bladeis prevented from being influenced, and the parameter measurement accuracy is high compared with conventional pressure probe and blade-type probe measurement technologies.

Description

technical field [0001] The invention belongs to the field of power machinery and relates to a turbine, in particular to a mortise-type turbine blade with five pressure-sensing holes on the front edge of a primitive level. Background technique [0002] There are many ways to install the turbine stator blades to the casing, one of the more common installation methods is the circumferential tongue-and-groove connection. The specific method is that the blade has tenons on the blade top and the blade root respectively, and the blade can be slid into the casing and the circumferential tenon groove on the hub through these two tenons, and then the blade is fixed with locking pieces or rivets. This installation method can avoid opening holes on the casing, and at the same time, because there is a large gap between the blade top tenon and the tenon groove, cooling air can be passed through the gap to cool the blade. [0003] In the turbine, a cylinder coaxial with the turbine is use...

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is: the existing turbine blade design does not include the interstage aerodynamic parameter measurement design, resulting in the impossibility of accurate measurement of the interstage flow field parameters in the narrow flow channel between the small-sized turbine blade rows. A mortise-type turbine blade with five pressure-sensing holes on the leading edge of the primitive stage solves the technical problem that accurate measurement of flow field parameters between stages cannot be carried out in the narrow flow channel between small-sized turbine blade rows

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