Performance and Flow Field Analysis of Flapper Deflection Servo Valve

Lv, Xinbei; Vladimir, Lomakin; Li, Songjing

doi:10.1109/gfps.2018.8472394

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Works [17,18] tackle the numerical methods to study the characteristics of devices such as nozzle-flap. The numerical modeling of the flow in a control valve such as nozzle-flap is described in [17]. By reconfiguring the inlet to the nozzle section of the valve, the maximum sensitivity of the valve is ensured.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Devising quality control criteria for manufacturing control valves of the type «nozzle-flap»

Lytviak¹,

Комар²,

Derevyanko³

et al. 2021

EEJET

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This paper is a continuation of research into the causes and ways to eliminate the generation of self-oscillations in the system of automatic regulation of rotations of the free turbine in the turboshaft gas turbine engines of helicopters. The study of dynamic processes in the system of automatic regulation of free turbine’s rotations in a turboshaft GTE has shown that one of the reasons for the development of self-oscillations is the poor performance of the control valve of the type «nozzle-flap» in the rotation regulator’s hydraulic drive. At a pump-regulator plant, the criterion for the quality of control valve execution or repair implies that the geometric size of the valve parts and the flow rate of working fluid through the valve when the flap is closed meet the technical requirements. As practice shows, this is not enough. With this approach, valve defects manifest themselves only during the tests of assemblies as part of the engine. This paper proposes a method to examine the characteristics of control valves such as «nozzle-flap», as well as criteria for assessing the quality of their execution. Experimental characteristics of control valves such as «nozzle-flap» for an actual regulator of free turbine rotation frequency are given. New data on the outflow of liquid from the nozzle with a flap have been obtained. It is shown that the destruction of the stagnation zone in the nozzle tip could result in that the valve flow rate increases, which negatively affects the characteristics of the hydraulic drive and regulator in general. A technique has been proposed to improve the stability of the valve’s performance by increasing the relative length of the nozzle. It is shown that the most informative characteristic of the valve is the dependence of flow rate on the position of the flap. Based on this characteristic, it is possible to determine the criteria for rejecting valves without testing them as part of the assembly

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Devising quality control criteria for manufacturing control valves of the type «nozzle-flap»

Lytviak¹,

Комар²,

Derevyanko³

et al. 2021

EEJET

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Calculation of a three-stage electro-hydraulic amplifier

Sosnowski

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Особливості Статичних Характеристик Регулятора Обертів Вільної Турбіни Насоса-Регулятора Типу Нр-3

Литвяк¹,

Комар²

2020

soivt

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Представлені результати експериментальних досліджень статичних характеристик регулятора обертів вільної турбіни насоса-регулятора типу НР-3, призначеного для турбовального газотурбінного двигуна типу ТВ3-117. В результаті аналізу експериментальних статичних характеристик регулятора виявлені нелінійні ділянки. Нелінійність статичної характеристики регулятора може призводити до незадовільної роботи системи автоматичного регулювання двигуном. Показано, що статична характеристика регулятора обертів вільної турбіни є підтвердженням якості виготовлення або ремонту насосів-регуляторів типу НР-3 при приймально-здавальних випробуваннях.

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Performance and Flow Field Analysis of Flapper Deflection Servo Valve

Cited by 3 publications

References 3 publications

Devising quality control criteria for manufacturing control valves of the type «nozzle-flap»

Devising quality control criteria for manufacturing control valves of the type «nozzle-flap»

Calculation of a three-stage electro-hydraulic amplifier

Особливості Статичних Характеристик Регулятора Обертів Вільної Турбіни Насоса-Регулятора Типу Нр-3

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