Reverse variable geometric turbine with low-viscosity and no-lift adjustable static blades

Abstract

The invention provides a reverse variable geometric turbine with low-viscosity and no-lift adjustable static blades. The turbine comprises a cabinet and a hub; the adjustable static blades and movableblades are uniformly mounted between the cabinet and the hub in the peripheral direction; the adjustable static blades are located on the front side, and the movable blades are located on the back side; the movable blades are mounted on the hub; a movable blade hub is arranged beside a static blade hub; a transition section with a support plate and a low-pressure turbine are arranged at the upstream of the adjustable static blades of the variable geometric turbine; static blades of the low-pressure turbine are on the front side, and movable blades of the low-pressure turbine are mounted on the hub; the transition section is positioned between the low-pressure turbine and the variable geometric turbine; the viscosity of the adjustable static blades is lower and within 0.6-1.1; the adjustable static blades are low in blade shape bending degree, and the blade type lift coefficient is as low as 0.15-0.45; and the variable geometric turbine and the low-pressure turbine are opposite in rotating direction. The turbine can effectively reduce the end gaps and the gap leakage quantity of the adjustable static blades, obviously reduces the airflow turning angles of the adjustable static blades, improves the multi-working-condition efficiency of the variable geometric turbine, and achieves excellent working reliability.

Description

technical field [0001] The invention relates to a turbine of a gas turbine / aeroengine, in particular to a reverse transformation geometry turbine with low-consistency and non-lift blade-type adjustable vanes. Background technique [0002] Gas turbines / aero engines often operate under off-design conditions, and the efficiency of the turbine will be greatly reduced at this time. The variable geometry turbine technology can effectively adjust and optimize the matching between the flow parts of the gas turbine / aero-engine, and improve the acceleration and deceleration characteristics and low-condition performance of the gas turbine / aero-engine. Adjusting the installation angle of the turbine vane is an effective variable geometry method. [0003] In the variable geometry turbine adjustable vane structure in the prior art, in order to ensure that the turbine vane can rotate, there must be a gap between the upper and lower end walls of the vane, which causes the leakage loss of t...

AI Technical Summary

Problems solved by technology

[0003] In the variable geometry turbine adjustable vane structure in the prior art, in order to ensure that the turbine vane can rotate, there must be a gap between the upper and lower end walls of the vane, which causes the leakage loss of the vane, and the adjustable vane shape itself has The curved angle further aggravates the complexity of the internal flow field of the adjustable vane under variable working conditions, seriously affecting the turbine efficiency

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