Обернена аеродинамічна задача для оптимального проектування кільцевих дифузорних каналів турбомашин

Abstract

Thesis for degree of Candidate of Sciences in Technique for speciality 05.05.16 – turbomachine and turbine-installations. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2015. The thesis is devoted to development of method for direct and inverse aerodynamic problems solution for annular transition and exhaust ducts of turbomachine, which takes into account the organization of computing processes of optimal design. The direct and inverse problems are divided into separate subproblems, independent of each other, which can be solved in any order or simultaneously, providing the ability to control form any region of the projected duct, and permit significantly reduce design time. Individual subproblems are resolved nonlinear programming methods that do not require significant amounts of information storage. Based on the method of inverse problem of optimum design of diffusers was developed. Designed diffuser with degree of expansion – two, axial and radial dimensions and curved outline, which has in-separation flow, low losses and low sensitivity to changes in operating condition in the ranges typical for exhaust diffuser compressors and power gas turbines, and its axial dimension to 20% lower limit value of the axial dimension to prior to separation diffuser with straight outline and the same degree of expansion.