Ivan Komarov

Improving the methodology of main power equipment choice for the gas turbine plants

Our paper considers the problem of economic substantiation of the choice of the main power equipment at the stage of functional studies of investment projects in conditions of uncertainty and incompleteness of initial data. As a solution to the designated problem we suggest using the method of the best equipment for gas turbine power plant choice. The method is based on an optimality criterion of power equipment choice which allows us to determine the best solution for the gas turbine from the perspective of capital and operating costs minimizing.

The boundary layer separation from streamlined surfaces and new ways of its prevention in diffusers

This work provides a detailed analysis of all force conditions acting in the limits of the boundary layer on the moving fluid and gas media, and shows that a value of the transverse gradient of a shear stress δτ/δy, directly on the streamlined surface, is a main condition determining the possibility of attached flow along the streamlined surface in divergent zones. From an analysis of all the forces and their development in the converging flow, an effective way of prevention of the flow separation from streamlined surfaces of the cone-type, ring-type and axial-radial diffusers was developed that provides the flow stabilization in the wide-angle diffusers and multiple reduction of the dynamic load level acting on the walls of the mentioned devices. Results of the CFD-modeling and experimental investigations for flat asymmetric and wide-angle conical diffusers are presented in this paper.

Superpowerful combined cycle power units with one gas turbine

This paper deals with different ways to increase the unit capacity of combined cycle power plants (CCPP) with an in-line equipment layout using a single gas turbine. The transition to a double flow gas turbine using a low-speed low pressure compressor connected with a low-speed steam turbine is a revolutionary way to solve the above problem. The double-shaft compressor is commonly designed with two additional internal bearings and is offered as a solution. The first stages of such a compressor (low pressure compressor (LPC)) connect with the steam turbine, but the second high-pressure group of stages (high-pressure compressor (HPC)) is driven by the gas turbine. So the gas turbine unites a start-up at the base of the HPC. The low pressure compressor and steam turbine can be designed with low revolution speed, which considerably increases air flow through the compressor and leads to an increase in the combined cycle power plant’s power capacity.

Thermodynamical aspects of the passage to hybrid nuclear power plants

This paper deals with a method of efficiency and power capacity for nuclear power plants, with the increase of pressurized water reactors at the expense of the passage to hybrid technologies. The essence of such a passage lies within two types of fuel applications and is realized by outer (in the case of a nuclear steam generating unit) steam superheater usage, which consumes fossil or hydrogen fuel.