Search academic texts

Information × Registration Number 0222U001277, 0117U000874 , R & D reports Title Improvement of working processes and designs of low-pressure parts of power turbines during operation in various modes popup.stage_title Head Shubenko Oleksandr L., Доктор технічних наук Registration Date 26-01-2022 Organization A. Podgorny Institute of Mechanical Engineering Problems of the National Academy of Sciences of Ukraine popup.description2 The object of research is the working processes in the stages of the low-pressure cylinder of high-power steam turbines. The aim of the work is to develop a methodological approach and constructive measures to solve the problem of improving the efficiency of the turbine. Research methods are analytical modeling of steam motion structures, structural-genetic analysis and synthesis, expert evaluation. For the first time a methodological approach to the analysis of thermo-gas-dynamic characteristics of steam flow in stages of high fanning of powerful steam turbines at flow-low rate modes was created. The determination of the rational values of ventilation losses of stages of blades overheating is important for district heating turbines. The structure of steam flow movement, the process of shelter separation, nucleation and development of the vortex formed in the intercrown gap, the steam temperature that can be reached in blades of the last stages are analyzed. For the first time, analytical dependences have been developed to determine the idle mode and turbine power losses. The obtained results are the basis for the development of constructive measures to reduce the negative impact of flow-low rate modes on the performance of the turbine. A new approach to the organization of separation-evaporative moisture extraction in the last stages of the turbine using a hollow guide vane blade is proposed. For the first time, an increase in the electric generation of a steam turbine with a superhydrophobic coating of the nozzle surface of the turbine steam stages is predicted. This makes it possible to reduce the size of moisture droplets, which reduces the erosion of blades and additional generation. Through expert assessment, they reduce the droplet size on the separation moisture and energy loss, which with built-in superhydrophobic coating on the upper half of the folded surface of the nozzles of the last stage K-325-23.5 increase in electric generation can be 370 kW. Product Description popup.authors popup.nrat_date 2022-03-09 Close