Design And Internal-flow Analysis Of Inward-flow-radial Turbine For Energy Recovery

A lot of low-quality energy in metallurgy, chemical, gas wells and other industrial exhaust can be used, and inward-flow radial turbine can be widely used in this kind of energy recovery. Making reliable design and performance research for inward-flow radial turbine is benefit for energy conservation and valuable in industrial-applications and has strategic significance. In this paper, the design method based on the principle of one-dimension-steady flow is adopted to successfully design out an efficient inward-flow-radial turbine with its given working condition. Fortran language is applied to write program for thermal design calculation of inward-flow-radial turbine. Non-developable ruled parabolic shaping method is adopted to shape the blades with the basic parameters obtained under a given inlet and outlet boundary conditions. Numerical simulation of the internal flow is done to the designed radial turbine using NUMECA software. From the geometric point of view, a new, more facility and more efficient meridional-flow-channel- line-forming method is put forward. Analyzing and comparing are done to the internal flow channel with the new shaped meridional-flow-channel line and with the traditional design-based line, which demonstrates the new meridional-flow-channel line access to a more reasonable flow field. Its overall efficiency can increase 1.5 percentage points comparing to the traditional design. At last, numerical simulation and detailed analysis are carried out to a kind of real inward-flow-radial turbine with NUMECA, which verifies that this turbine impeller is efficient and the design is very successful. And then a comparative analysis is made between the designed turbine impeller and the real one. Results show that the impeller designed by this paper obtains better flow field on the proximity of large curvature of the shroud. And it also proves that with non-developable ruled parabolic shape method can design rational and efficient blade profile. The results demonstrate that design method based on one-dimensional steady flow can quickly obtain efficient inward-flow-radial turbine.