Effect of pre-swirl nozzle closure modes on unsteady flow and heat transfer characteristics in a pre-swirl system of aero-engine

Liu, Gaowen; Lei, Zhao; Lin, Aqiang; Qing, Feng; Yan, Chuanwei

doi:10.1177/09544100211019145

Cited by 4 publications

(5 citation statements)

References 46 publications

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“…A portion of the secondary flow from the combustor is used to prevent hot gas ingestion into the upstream wheel space of the HP turbine stage, and its reminder is conducted on the pre-swirl system to make the flow appropriate to cool the HP turbine blade. 17 Pre-swirl systems can be divided into two categories: direct-transfer (large radius) pre-swirl systems and cover-plate (small radius) pre-swirl systems. 18 As shown in Figure 5(a), the air flows into the pre-swirl cavity after being pre-swirled by the nozzle.…”

Section: Methodsmentioning

confidence: 99%

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Yang

Jian

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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This research studies the performance of an ultra-high bypass ratio turbofan engine, and specifically its secondary air system (SAS). A co-simulation methodology is explored whereby a high-fidelity SAS model and an engine performance code featuring flexible modules can be coupled and interactively executed. The percentage of bleed flows and boundary conditions for the SAS are updated at each iteration step. For this purpose, a SAS model including different elements is developed. Furthermore, a commercial computational fluid dynamics (CFD) solver is adopted to capture the complex flow field in the pre-swirl system. The credibility of cycle calculation and SAS elements is validated by comparing with publicly available data. Subsequently, an elaborately designed SAS is modeled and co-simulated with the AGTF30 engine using a flow network simulation method. The coupling effect between the engine performance and the SAS is studied for eight different flight conditions. The correlation and prediction of engine performance due to seal clearance change is presented. The co-simulation approach clarifies the mutual interactions between the engine overall parameters and the SAS. The results reveal that the enhanced flow network model can improve the simulation accuracy of engine performance over a wide range of operating conditions.

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Section: Methodsmentioning

confidence: 99%

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Yang

Jian

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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show abstract

“…For pre-swirl nozzles, the swirl ratio can characterize the pre-swirl velocity and be used to evaluate temperature drop [9]. Furthermore, Shen et al [28] demonstrated that the swirl ratio in a rotating cavity is proportional to temperature rise.…”

Section: Dimensional Parametersmentioning

confidence: 99%

“…Because of the compact layout and the requirement for high pressures, the airflow in the radial pre-swirl system is structured to flow from a low radius to a high radius. In previous studies, the effect of the geometrical parameters of the pre-swirl nozzle was investigated to improve its adiabatic effectiveness and discharge coefficient [9][10][11]. To optimize the flow structure further, Lee et al [7] proposed vane-shaped pre-swirl nozzles and performed a parameter sensitivity analysis.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Impellers on the Cooling Performance of a Radial Pre-Swirl System in Gas Turbine Engines

Shen,

Wang,

Liang

2024

Aerospace

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Impellers are utilized to increase pressure to ensure that a radial pre-swirl system can provide sufficient cooling airflow to the turbine blades. In the open literature, the pressurization mechanism of the impellers was investigated. However, the effect of impellers on the cooling performance of the radial pre-swirl system was not clear. To solve the aforementioned problem, tests were carried out to assess the temperature drop in a radial pre-swirl system with various impeller configurations (impeller lengths l/b ranging from 0 to 0.333). Furthermore, numerical simulations were used to investigate the flow and heat transfer characteristics of the radial pre-swirl system at high rotating Reynolds numbers. Theoretical and experimental investigations revealed that the pre-swirl jet and output power generate a significant temperature drop, but the impellers have no obvious effect on the system temperature drop. By increasing the swirl ratio, the impellers reduce the field synergy angle and thus improve convective heat transfer on the turbine disk. In addition, increasing the impeller length can reduce the volume-averaged field synergy angle and improve heat transfer, but the improvement effectiveness decreases as the impeller length increases. Thus, the study concluded that impellers could improve the cooling performance of the radial pre-swirl system by enhancing disk cooling.

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“…Currently, research on the contact characteristics between rough surfaces mainly focuses on heat transfer and dynamics [6]. Aerodynamic and thermodynamic performances are of importance for safe engine operation [7][8][9]. Therefore, the key to the analysis of discontinuous contact surfaces lies in the study of contact stiffness and thermal resistance on these two surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Chen

Chu

2022

Aerospace

Self Cite

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According to the discontinuous structural characteristics of a gas turbine, by considering the contact thermal resistance of the rough surface, a contact thermal resistance measurement experiment was conducted in this study. The main objectives of this work were to investigate the influence mechanism and change law of the contact thermal resistance characteristics on flange installation. Furthermore, this study conducted a theoretical analysis of contact thermal resistance and the calculation of a typical flange mounting edge based on actual operating conditions. The research results show that the contact thermal resistance of a typical flange mounting edge increases with an increase in flange clearance under different tightening torques, which is essentially proportional to the flange clearance. As the flange clearance increases, the unit contact thermal conductivity firstly decreases rapidly. Then, as the flange clearance reaches 0.4 mm, the decreasing rate of unit contact thermal conductivity tends to flatten. In addition, the contact thermal resistance of the typical flange mounting edge decreases with the increase in the tightening torque under different flange clearances. Furthermore, the contact area ratio is not related to the material, and the contact thermal resistance under actual working conditions can be calculated using the unit contact area.

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Effect of pre-swirl nozzle closure modes on unsteady flow and heat transfer characteristics in a pre-swirl system of aero-engine

Cited by 4 publications

References 46 publications

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Effect of Impellers on the Cooling Performance of a Radial Pre-Swirl System in Gas Turbine Engines

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

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