Estimation of cooling flow rate for conceptual design stage of a gas turbine engine

Filinov, EP; Кузьмичев, Венедикт Степанович; Tkachenko, Andrey; Ostapyuk, YaA; Krupenich, I N

doi:10.1177/09576509211014981

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…So, using too much refrigerant causes a decrease in performance, while too little refrigerant leads to deficient cooling [18]. Approximately 5% of the total air is used to cool the combustor walls, discs and turbine vanes [19].…”

Section: Jetmentioning

confidence: 99%

The Effects of Mainstream Reynolds Number and Blowing Ratio on Film Cooling of Gas Turbine Vanes

Sierra-Vargas,

Garzón-Alvarado,

Duque-Daza

2023

Fluids

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Film cooling performance was evaluated numerically for three mainstream Reynolds numbers and four blowing ratios (BR). A computational model based on finite volume discretization was used to solve an incompressible and transient flow over a NACA 4412 cascade vane. Several passive scalars were included in the model to evaluate the condition of adiabatic temperature and constant temperature for the surface vane. For the adiabatic temperature condition, the film effectiveness mainly depends on the jet trajectory and recirculation zones. For the constant temperature condition, the net heat flux reduction (NHFR) varies according to the boundary layer separation and reattachment. Consequently, misleading conclusions could be drawn if only one of the two approaches is adopted. For instance, the mainstream Reynolds number Re∞ = 3615 reached a maximum average effectiveness lower than 0.3 with an average NHFR of 0.25. However, for Re∞ = 10,845 the maximum average effectiveness was close to 0.45, but with negative average NHFR values. This finding demonstrates the need to explore new indicators like jet trajectory, convective coefficient and skin friction coefficient, as presented in this paper.

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Section: Jetmentioning

confidence: 99%

The Effects of Mainstream Reynolds Number and Blowing Ratio on Film Cooling of Gas Turbine Vanes

Sierra-Vargas,

Garzón-Alvarado,

Duque-Daza

2023

Fluids

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“…Reception management programs built on the basis of parameter complexes of this type can take the form [8]:…”

mentioning

confidence: 99%

“…Processes of acceleration and reset in the plane of the characteristics of the compressor: 1 is the line of stable modes of operation; 2 is the process of acceleration; 3 is the reset process [6], [7] The disadvantage of these programs is the impossibility when choosing them to accurately take into account such factors as the change in the fuel combustion completeness ratio, heat removal in the engine structure, etc., which as a result does not allow to meet the requirements for the acceleration time when the operating conditions change. This makes it possible to develop control programs that use a set of parameters that includes rotor acceleration [8] But in this case, the restrictions on GDS reserves are less accurately taken into account. Therefore, modern ACSs use both types of programs at the same time, and programs of the first type are entrusted with the task of protecting against violations of GDS.…”

mentioning

confidence: 99%

Control Programs of the Aviation Gas Turbine Engine in the Modes of Acceleration, Gas Reset, Start-up. Optimization and Estimation of the Quality of Control Programs

Tovkach

2022

ECS

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The article is devoted to the formation of requirements for the accuracy of regulation of an aviation gas turbine engine, one of which is the maintenance of engine thrust at a given operating mode, regardless of the engine condition, within the gas temperature margin. Its value should not be significantly affected by turning on or off additional power and air consumers, as well as various regulatory influences on the part of the automatic control system (turning on or turning off the bypass in the compressor and blowing the housings, partial restriction of the supply of cooled air, changing the position of the guiding devices). Fulfilling the requirements for the accuracy of regulation is important for ensuring the reliability and safety of the operation of the power plant and the convenience of controlling the aircraft. In order to reduce operating costs, it is necessary that during operation, a minimum number of additional settings of the ACS in the acceleration mode, gas reset and start-up mode are required. The control program is implemented in the form of a automatic control system (ACS), which is a closed circuit of the main feedback. There is also a flexible local feedback loop in the circuit, which is designed to stabilize the ACS, which contributes to the fact that the ACS is quite stable. The presence of feedback in the ACS indicates that the system may be unstable, so the analysis of the ACS should include an assessment of its stability and, if necessary, the selection of measures and means for its stabilization. Changing the input signal at the first moment of time leads to a corresponding increase in deviation, since the links in front of the object and the object itself have inertia and therefore the rotation frequency cannot change instantly. The change in deviation, being an amplified amplifier, thyristor converter and generator, taking into account their inertia, leads to a gradual change in the control value, the voltage on the anchor, which smoothly changes the frequency of rotation of the shaft so that the tracking error, that is, the deviation, is directed to zero. Voltage feedback stabilizes the ACS and increases its speed. This is how tracking is done. The implementation of wireless technologies in the ACS of the gas station has been studied, which will allow to reduce the mass and dimensions of the nodes due to the reduction of the number of connectors and cables, increase the reliability and accuracy of the adjustment of the ACS, reduce maintenance costs and increase fire safety.

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Research on active modulation of gas turbine cooling air flow

Long

Zhou

Qin

et al. 2023

Applied Thermal Engineering

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Estimation of cooling flow rate for conceptual design stage of a gas turbine engine

Cited by 6 publications

References 20 publications

The Effects of Mainstream Reynolds Number and Blowing Ratio on Film Cooling of Gas Turbine Vanes

The Effects of Mainstream Reynolds Number and Blowing Ratio on Film Cooling of Gas Turbine Vanes

Control Programs of the Aviation Gas Turbine Engine in the Modes of Acceleration, Gas Reset, Start-up. Optimization and Estimation of the Quality of Control Programs

Research on active modulation of gas turbine cooling air flow

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