Jet-Reactive Turbine Circular Efficiency

The Ukrainian power generation industry is a fundamental branch for developing the state economy and keeping its sovereignty. A significant problem is the reasonable use of Earth's power resources today. Ukraine has been trying to resolve this issue, which is proved by the implemented program “Safety, Energy Performance, Competitiveness (the Ukrainian Power Strategy till 2035)”. It provides a shift from the old energy industry model to the new one with a larger competitive space and opportunities to increase energy performance via renewable and alternative power sources. A sensible way to complete this task is waste energy recycling. Turbine-generator sets can decrease pressure and utilize potential energy of gas or steam pressure to produce electricity. It is another economic and technological challenge for Ukraine and the whole world. Simultaneously, that opens new prospects for introducing innovative projects. The article is devoted to studying gas-dynamic processes in jet-reactive turbine (JRT) flow ducts. The research assesses the off-design traction nozzle influence on the JRT circular efficiency. There are detected dependencies between circular efficiency and dimensionless velocity $$\lambda_{Wout.t}$$ λ W o u t . t by certain feed-in nozzle inlet pressure during design (S = 1) and off-design conditions (S > 1). Diagrams of circular efficiency against blade wheel velocity ( $$\overline{U}$$ U ¯ = 0…1) are drawn. The research established that the feed-in nozzle inlet pressure rise causes the circular efficiency to fall. The efficiency optimum is defined by the blade wheel velocity for design and non-design circumstances. The highest efficiency is found by design traction nozzle operation (S = 1).