Aerodynamic Performance Influence Of Curved Blades To The Guided Blade Cascades

Turbine is the national economic construction in an important industry, is the basis for the power industry, but also reflects a country's level of design and manufacture of steam turbines. After 50 years of continuous efforts, China has initially established when the steam turbine industry, the full use of foreign technical gradually move to a path of self-development capacity. Since reform and opening, China's turbine industry has been rapid development. As China's rapid economic development and stable demand for electricity has increased every year, especially in recent shortage of energy resources, improve the overall performance of steam turbine workers strive our goal.Using three-dimensional geometry modeling software UG build three vane cascade, the surface geometry with high precision. For the software division with autogrid structured to provide a good model for grid. Structured CFD grid to speed up the convergence rate, and is likely to converge, to correctly simulate turbine cascade flow field set up the basic environment. The numerical results indicate that anti-bent blade can form anti-meridian plane "C" type pressure distribution, while being bent form "C" type pressure distribution. By the "C"type pressure distribution in the channel was carried to the leaves of the central vortex, intensity and the extent of the increase can be more effective entrainment of the low energy fluid near the end wall, reducing the side wall near the loss, while the central leaves losses increase. The total pressure loss from the point of view, curved blade can effectively change the loss distribution, the total pressure loss from the total number of comparative point of view, makes the loss of anti-bend increased, reducing the total loss is bent, curved blade of which is the minimum loss.