Prediction of the sealing flow effect on the temperature drop characteristics of a pre-swirl system in an aero-engine

Liu, Gaowen; Wang, Xinxin; Gong, Wenbin; Lin, Aqiang

doi:10.1016/j.applthermaleng.2021.116717

Cited by 23 publications

(4 citation statements)

References 26 publications

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“…As a result, the system outlet is configured to the static pressure boundary. For the steady simulation of pre-swirl systems, the frozen rotor algorithm is recommended to be applied to the rotor-stator interface [8,[29][30][31]. The specific boundary conditions are shown in Table 2.…”

Section: Computational Model and Boundary Conditionsmentioning

confidence: 99%

“…Commonly, the pre-swirl nozzles generate significant temperature and pressure drops. Although flow and heat transfer have been extensively studied in the axial and cover-plate pre-swirl systems [5][6][7][8], the radial pre-swirl system has received less attention. 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.…”

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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Section: Computational Model and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…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

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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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“…According to three-dimensional (3-D) numerical simulations for a pre-swirl system, [42][43][44] the interface in the rotor-stator cavity is suggested to apply the frozen-rotor method instead of the mixing plane method in the steady-state calculations. Liu et al 45,46 conducted computational fluid dynamics (CFD) analysis on the pressure ratio and entropy increment in a coverplate pre-swirl system. Besides, a low-cost steady-state method for transient problems is provided.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Lei

Lin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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The pre-swirl system is of great importance for temperature drop and cooling air supply. This study aims to investigate the influencing mechanism of heat transfer, nonuniform thermodynamic characteristics, and cooling air supply sensitivity in a pre-swirl system by the application of the flow control method of the pre-swirl nozzle. A novel test rig was proposed to actively control the supplied cooling air mass flow rate by three adjustable pre-swirl nozzles. Then, the transient problem of the pre-swirl system was numerically conducted by comparison with 60°, 120°, and 180° rotating disk cavity cases, which were verified with the experiment results. Results show that the partial nozzle closure will aggravate the fluctuation of air supply mass flow rate and temperature. When three parts of nozzles are closed evenly at 120° in the circumferential direction, the maximum value of the nonuniformity coefficient of air supply mass flow rate changes to 3.1% and that of temperature changes to 0.25%. When six parts of nozzles are closed evenly at 60° in the circumferential direction, the maximum nonuniformity coefficient of air supply mass flow rate changes to 1.4% and that of temperature changes to 0.20%. However, different partial nozzle closure modes have little effect on the average air supply parameters. Closing 14.3% of the nozzle area will reduce the air supply mass flow rate by 9.9% and the average air supply temperature by about 1 K.

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Prediction of the sealing flow effect on the temperature drop characteristics of a pre-swirl system in an aero-engine

Cited by 23 publications

References 26 publications

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

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

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

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