Theoretical Study on the Spray Characteristics of Plain Jet Atomization Under High Back Pressure

Suo, Jianqin; He, Lu

doi:10.2514/6.2007-5689

Cited by 2 publications

(3 citation statements)

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“…We can use another equivalent facility, called ''facility 2,'' to express their joint effect. Substituting (9) into (10), then combining with (16):…”

Section: Mathematical Modelmentioning

confidence: 99%

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A mimicking technique of back pressure in the hardware-in-the-loop simulation of a fuel control unit

2019

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In the hardware-in-the-loop (HIL) simulation of the fuel control unit (FCU) for aero-engines, the back pressure has a great impact on the metered fuel, thus influencing the confidence of simulation.During the practical working process of an aero-engine, the back pressure of FCU is influenced by the combined effect of the pressure of combustion chamber, the resistance of spray nozzles, and the resistance of the distribution valve. There is a need to study the mimicking technique of FCU back pressure. This paper models the fuel system of an aero engine so as to reveal the impact of FCU back pressure on the metered fuel and come up with a scheme to calculate the equivalent FCU back pressure.After analyzing the requirements for mimicking the pressure, an automatic regulating facility is designed to adjust the FCU back pressure in real time. Finally, experiments are carried out to verify its performance.Results show that the mimicking technique of back pressure is well suited for application in HIL simulation. It is able to increase the confidence of simulation and provide guidance to the implementation of the mimicking of FCU back pressure.Hardware-in-the-loop (HIL) simulation enables the operation and testing of actual components of a system along with virtual computer-based simulation models of the rest of the system in real time. 1,2 In this way, quality of testing is enhanced, thus shortening the design cycle and improving the reliability of the tested components.Fuel control unit is a fuel-metering device that regulates the fuel flow to the engine in accordance with the pilot's demand, ambient environmental conditions, and other related factors. It is a crucial part of engine control system. Usage of HIL simulation for testing aero-engine FCU has been reported in several researches for different purposes. 4 have investigated the complex interaction between the FCU hardware and overall aircraft performance, while Karpenko and Sepehri 5 objectively tested novel fault tolerant control and diagnostics algorithms for fluid power actuators. Principles of the fuel control are presented by Tudosie, 6 among which the type with constant fuel differential pressure and Simulation,

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“…We can use another equivalent facility, called ''facility 2,'' to express their joint effect. Substituting (9) into (10), then combining with (16):…”

Section: Mathematical Modelmentioning

confidence: 99%

“…However, they both change with the operating state of the aero-engine. According to some researches, 9,10 fuel regulated by the FCU is closely related to its back pressure. Regulating effects differ even in cases of the same metering valve opening but with different back pressure, which influences the confidence of the simulation.…”

Section: Introductionmentioning

confidence: 99%

A mimicking technique of back pressure in the hardware-in-the-loop simulation of a fuel control unit

2019

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“…Экспериментальные данные о факелах распыливания при вы-соком противодавлении весьма противоречивы. Проведённый в [1] анализ данных по-казал, что при распыливании пневматическими форсунками независимо от того, рас-пыляется ли плёнка жидкости или струя, измеренные средние размеры капель SMD уменьшаются с увеличением противодавления. Для центробежных форсунок данные о размерах капель в факеле распыливания находятся в противоречии.…”

Section: Introductionunclassified

Characteristics of a fuel spray downstream the pressure atomizers under high pressure in the combustion chamber

Sviridenkov¹,

Третьяков

2016

VESTNIK of Samara University. Aerospace and Mechanical Engineer

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The paper presents numerical calculations of a fuel spray downstream a swirl-type fuel injector carried out for various pressures in the combustion chamber using the model of liquid film motion. The effect of the chamber pressure, or, to be more exact, the air density in the pressure chamber on the fuel spray characteristics is investigated. The mathematical model was constructed on the assumption of one- dimensional and steady swirling flow. The liquid is considered to be incompressible and have zero pressure gradient in the direction of the film motion and in the tangential direction. The influence of viscous forces on the motion of liquid is neglected, but the viscous interaction at the interface between liquid and gas is taken into account. The change of velocity in the circumferential and normal directions can be neglected, because in practice the film thickness is considerably smaller than the spray radius. It is shown that the pressure increase in the combustion chamber makes spray characteristics significantly different from those observed at atmospheric pressure. An increase of pressure results in increasing the thickness of the fuel film and decreasing the spray-cone angle. It leads to an increase in the average Sauter diameter in the spray of fuel atomized by the pressure atomizer. The air flow downstream the swirl nozzle has the opposite influence on the size of drops in case of increased pressure in the chamber.

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Theoretical Study on the Spray Characteristics of Plain Jet Atomization Under High Back Pressure

Cited by 2 publications

References 1 publication

A mimicking technique of back pressure in the hardware-in-the-loop simulation of a fuel control unit

A mimicking technique of back pressure in the hardware-in-the-loop simulation of a fuel control unit

Characteristics of a fuel spray downstream the pressure atomizers under high pressure in the combustion chamber

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