Abstract
On the basis of the one-dimensional theory of calculating the operation of steam turbine stages the method for determining the idle mode, the initial data for which are the geometric characteristics of the blade rows is proposed. Formulas have been obtained that make it possible to calculate the efficiency in the proximity of Rotor Blades (RB) at operating modes from nominal to the idle mode, depending on the flow rate of the stage and taking into account the use of kinetic energy with the runaway velocity and losses arising at off-design angles of flow on the Rotor Blade (RB). The results of possible computational studies and their comparison for an incompressible working fluid with the results of experimental studies showed the good possibilities of the proposed method for determining the idle mode in a wide range of the characteristics of stages.
Highlights
One of the most acute problems in the Ukrainian electric power industry is the shortage of maneuverable capacity, which is provided by the power units of thermal power plants
On the basis of the one-dimensional theory of calculating the operation of steam turbine stages the method for determining the idle mode, the initial data for which are the geometric characteristics of the blade rows is proposed
Formulas have been obtained that make it possible to calculate the efficiency in the proximity of Rotor Blades (RB) at operating modes from nominal to the idle mode, depending on the flow rate of the stage and taking into account the use of kinetic energy with the runaway velocity and losses arising at off-design angles of flow on the Rotor Blade (RB)
Summary
One of the most acute problems in the Ukrainian electric power industry is the shortage of maneuverable capacity, which is provided by the power units of thermal power plants. Regulation of daily schedules of electricity consumption has complicated the operating modes of thermal power plants and has led to an increase in the number of powerful units which are put into reserve, deepening their nights unloading and an increased number of shutdowns on weekends All this causes accelerated wear of equipment and excessive fuel consumption when operating in low-efficiency modes at partial loads. In order to determine the efficient and safe operation of turbine plants at thermal power plants and combined heat and power plants (taking into account more detailed studies of gas-dynamic and thermal processes in a turbine), an important role is played by determining the idle mode of turbine stage when it is operating at partial loads Another approach to the determination of the idle mode which based on a simplified analysis of thermal processes occurring in an axial turbine stage is interested. Based on the movement of the working fluid on coaxial cylindrical (or close to them) surfaces and assuming that for the axial stage u1 ≈ u2 ≈ u, the specific energy (work) for the stage can be represented as
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