Throttling intensification of the flow part of flow control regulators

Ionaitis, R. R.; Chekov, M. E.

doi:10.1007/s10512-012-9565-y

At Energy

2012

DOI: 10.1007/s10512-012-9565-y

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Throttling intensification of the flow part of flow control regulators

R. R. Ionaitis¹,

M. E. Chekov²

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Cited by 3 publications

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“…The intensification of throttling in flow controllers was validated, including by means of visualization [6][7][8][9]. As the power and coolant pressure increase (to 8 MPa in VVER, 13 MPa in BN-1200, and 20 MPa in BREST), it becomes necessary to develop highly reliable flow controllers with a wide regulation range, long service life and linear and stable flow characteristics.…”

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confidence: 99%

Improvement of Coolant Flow Controllers

Ionaitis

Chekov

2014

At Energy

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The aim of this work is to validate the possibility of increasing the throttling effectiveness of the flow part in order to create compact and stable flow controllers which are noise-and vibration-free in the entire working range. The results of an analytical study of throttling processes are presented. The serviceability limits of flow controllers with a smooth flow section and the velocity extrema over the course of the regulating element are determined. The velocity ranges of different mechanisms for action of the coolant flow on the flow part of the controllers are validated. A method for calculating the effectiveness of the intensification of the throttling of particular flow controllers is developed. The experimental results make it possible to create high-performance flow controllers, including for NPPs to 20 MPa and to 600°C, and to ensure long-time stable operation in the entire regulation range.A characteristic of coolant flow control in NPP is that a large number of objects of regulation operate in parallel from a single power source. The flow rate of the medium through an individual element of an object of control is relatively low and the pressure drop on this device is large. For this reason, the throttling factor, defined as the ratio of the pressure drop on the flow controller to the squared flow through it, is large.Flow throttling by a relatively smooth flow section, which is formed by a moving element and seat, was adequate for power generation with medium-range pressure, pressure drop and temperature. In modern power engineering with its increasing parameters in a smooth flow section high flow velocities of the medium arise together with undesirable and even dangerous phenomena: noise, erosion-corrosion wear, vibration and cavitation. These factors affect the serviceability of a flow controller as a whole. To reduce the flow velocity, it is necessary to increase the hydraulic resistance coefficient or, in other words, to intensify throttling. To maintain the required pressure drop with a reduction of the flow velocity, the area of the flow section of the flow part must be increased in order to maintain the flow capacity.The geometric shapes of the flow section of controllers in NPP are specific and uncharacteristic for the setups generally used in industry. A concept for modernizing flow controllers in compliance with the norms and regulations has been developed at the Dollezhal Research and Development Institute of Power Engineering (NIKIET) and adopted by Rosatom [1,2]. Development work for fixtures used in power generation has begun [3].A patent and technical review was performed for flow controllers in connection with the development of an NPP for pressures 18-20 MPa and temperature 600°C [4,5]. The intensification of throttling in flow controllers was validated, including by means of visualization [6-9]. As the power and coolant pressure increase (to 8 MPa in VVER, 13 MPa in BN-1200, and 20 MPa in BREST), it becomes necessary to develop highly reliable flow controllers with a wide regulat...

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confidence: 99%

Improvement of Coolant Flow Controllers

Ionaitis

Chekov

2014

At Energy

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Investigation of the Hydrodynamic Structure of Throttled Fluid Flow

Ionaitis

Chekov

2013

At Energy

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The behavior of a gas–vapor system inside a cavitation bubble during axial valve operation

et al. 2020

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The energy industry needs reliable, environmentally friendly control valves, which include the category of control valves. The creation of conditions for reducing the intensity of cavitation effects at the initial stages of its development determines the main purpose of the study which aims to prevent possible negative consequences of developed cavitation, which in their turn include erosion of the flowing surfaces of the elements of the specified equipment and vibrations that go beyond operating standards. One of the possible ways to solve the problem is to use the process of throttling fluid flows in the working volume of the control device. The particular interest is paid to the mathematical description of the mechanism of formation of cavitation bubbles in terms of gas–vapor system. To obtain analytical results for describing the behavior of the gas–vapor system of the macro-system of cavitation bubbles, we used the authoring stochastic model of the cavitation bubbles formation process in the flow part of the axial valve. The model was constructed on the basis of the energy method in the framework of the equilibrium representation of states of an energetically closed macro-system. The dependence of the random component of the angular momentum of the cavitation bubble on the flow coefficient of the valve and the conditional diameter of its flow cross section for various ratios of gas and vapor concentration inside the bubbles has been analysed. The implementation of the process of throttling fluid flows in the control valve using the proposed design solution to the separator–external locking shell allows reducing the random component of the angular momentum of the cavitation bubble and increasing the valve throughput coefficient at various stages of the separator opening.

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Throttling intensification of the flow part of flow control regulators

Cited by 3 publications

References 1 publication

Improvement of Coolant Flow Controllers

Improvement of Coolant Flow Controllers

Investigation of the Hydrodynamic Structure of Throttled Fluid Flow

The behavior of a gas–vapor system inside a cavitation bubble during axial valve operation

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