Abstract
<p>This article studies the nature and causes of the dynamic loads exerted by the flow on the walls of the equipment, on an example of a curved component of the steam turbine steam supply system and examines the existing flow stabilizers used to control such loads. Based on the analysis of the shortcomings found in these devices, the article offers new designs of flow stabilizers. The newly developed devices reduce the flow area of the pipeline approximately twice less than the existing ones, so, they were supposed to have much lower hydraulic resistance. The study of the new the flow stabilizers’ efficiency was performed with the use of CFD methods and assessed in comparison with their wide used analogues. Based on the evaluation data, the designed devices provide a comparable level of decrease in dynamic loads, however, they have about five times lower hydraulic resistance. According to their design features, they are also supposed to have better mechanic strength characteristics.</p>
Highlights
1.1 How the Dynamic Loads come to beThe analysis of accidents at power plants and technologically related facilities shows that the most common cause of damage to the equipment, for example, to thermal hydraulic installations, safety valves and pipelines, is the dynamic loads induced by the flow of the working medium and affecting their parts
To achieve a greater degree of reliability of power equipment, we need to analyze in detail the character of the dynamic loads, as well as the structure of the flow that induces them, and develop an efficient way of their prevention
The main way of reducing the dynamic loads on the channel walls is to split the large eddy cores into smaller structures and to spread them homogeneously in the channel's cross-section (Grigoriev, 2014). This principle of counteracting the pressure pulsations is implemented in the so-called flow conditioners, or stabilizers, which most often look like perforated discs of various configurations, installed into pipelines (Figure 3)
Summary
The analysis of accidents at power plants and technologically related facilities shows that the most common cause of damage to the equipment, for example, to thermal hydraulic installations, safety valves and pipelines, is the dynamic loads induced by the flow of the working medium and affecting their parts. The most stressed parts are those that undergo a polar change in the direction of the flow of the working medium This happens due to centrifugal forces that throw liquid particles to the outer (concave) walls of a curved channel, which results in a lateral pressure gradient (Figure 1) (Deitch, 1961; Khazaei et al, 2010). The main way of reducing the dynamic loads on the channel walls is to split the large eddy cores into smaller structures and to spread them homogeneously in the channel's cross-section (Grigoriev, 2014) This principle of counteracting the pressure pulsations is implemented in the so-called flow conditioners, or stabilizers (aerodynamic filters, or swirl dampers), which most often look like perforated discs of various configurations, installed into pipelines (Figure 3)
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