Integrated pneumatic design method of axial-flow turbine and single-side radial steam/gas discharging system

Abstract

The invention discloses an integrated pneumatic design method of an axial-flow turbine and a single-side radial steam / gas discharging system. The method comprises: a) carrying out multiple-purpose design on the axial-flow turbine; b) under the real entry condition, carrying out multiple-purpose design on the single-side radial steam / gas discharging system; and c) carrying out matching analysis on the axial-flow turbine and the single-side radial steam / gas discharging system. The method has the following three effects: 1, the steam / gas discharging system is ensured to have good pressure-expanding capacity under the actual operation environment, thereby reducing the outlet backpressure of the turbine, increasing the output power of the turbine and improving the heat efficiency of a unit; 2, the uneven degree of the flowing circumference in the single-side radial steam / gas discharging system is weakened, and the fluctuant amplitude of an aerodynamic force of a moving blade of the turbine in a round is reduced; and 3, the low-frequency unsteady aerodynamic force of the turbine blade surface caused by flowing instability inside the steam / gas discharging system is reduced, and the operation safety of the unit is improved. The method disclosed by the invention is suitable for pneumatic design of the turbines and steam / gas discharging systems of all the axial-flow turbines / gas turbines for single-side radial steam / gas discharging.

Description

Technical field [0001] The invention relates to an integrated aerodynamic design method of an axial flow turbine and a unilateral radial exhaust steam / air system. Background technique [0002] The single-sided radial exhaust steam / gas system of high-power steam turbines and ship gas turbines is the flow-through component at the end of the flow channel, which is used to recover the residual speed kinetic energy of the turbine outlet. In this case, reduce the back pressure of the turbine, increase the power output of the turbine, and improve the thermal efficiency of the unit. Inside the single-sided radial exhaust steam / gas system, the steam / air flow from the turbine outlet to the exhaust steam / gas system outlet has a 90° turn, thus generating a non-axisymmetric flow field in the turbine outlet section, so that The turbine blades feel different back pressures at different circumferential positions; at the same time, the pressure pulsation caused by the instability of the flow in ...

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Problems solved by technology

See figure 2 , in the existing through-flow design method, the aerodynamic interaction between the blade row and the exhaust / gas system is not considered, and the turbine blades and the exhaust / gas system are usually carried out under the assumption of axisymmetric outlet and inlet flow conditions. Design, the performance of the obtained turbine and exhaust / gas system in the actual environment is quite different from the design value

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