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Simulation of the secondary air system of turbofan engines:Insights from 1D-3D modeling

Chinese Journal of Aeronautics 2023年第1期36卷 231-245页

作者： Xuesen YANG Menghua JIAN Wei DONG Qiannan XU School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Sichuan Gas Turbine Establishment Aero Engine Corporation of ChinaChengdu 610500China

Focusing on the internal flow and heat transfer analysis,a platform for the performance evaluation of the secondary air system(SAS)is developed.A multi-fidelity modeling technique has been developed in a turbofan engine model under different flight conditions.A turbine blade cool-ing model which integrates external heat transfer calculations and coolant side modeling with com-mon components is *** addition,the Computational Fluid Dynamics(CFD)method is selected to capture the complex flow field structure in the preswirl *** validity of the SAS models is compared with publicly available *** elaborately designed cooling system for the AGTF30 engine is analyzed through three main *** is found that the 1D-3D mod-eling technique can provide more accurate predictions of the SAS for the AGTF30 *** results demonstrate the versatility and flexibility of the SAS models,thereby indicating the capacity of meeting most of the demands of flow and thermal analysis of the SAS.

关键词： Blade cooling Multi-fidelity Preswirl system secondary air system Turbofan engine

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Theoretical and Experimental Studies for the Transient Response of Cavity

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Journal of Thermal Science 2020年第1期29卷 232-240页

作者： HU Jianping LIU Zhenxia ZHU Pengfei LYU Yaguo School of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine Xi’an 710129China

During the transient state of aero-engine,cavity has evidently transient characteristics in the secondary air *** investigate transient characteristics,theoretical and experimental studies were implemented for both static and rotating *** of all,the typical transient response phenomena in secondary air system were investigated based on the basic concepts of the dynamic *** to the basic theory of gas dynamics,the causes of transient phenomena were analyzed in two aspects,external disturbance,and system physical *** dimensionless parameters were introduced to analyze the transient response characteristics of air ***,the experimental results of the static cavity indicated that the actual response time increased with the increase of the inlet *** experimental results of the rotor-stator cavity showed that the low rotational speed on the response process had little effect,and the response time gradually increased when the speed continued to ***,the test results of multiple components suggested that when the valve was opening the inlet pressure of the static cavity increased quickly and then reached a stable value,but the pressure of the static cavity,stable pressure cavity and rotor-stator chamber rose *** was also obtained the actual response time of them was *** closer the measuring points were to the disturbance source,the shorter the delay time was.

关键词： secondary air system static cavity rotating cavity transient response experiment

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维普期刊数据库

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Effects of Sealing Flow Supply Configuration with Holes on Sealing Effectiveness of Turbine Rim Seal

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Journal of Thermal Science 2023年第1期32卷 366-386页

作者： GAI Zepeng ZHU Pengfei HU Jianping LIU Zhenxia YIN Hang School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

This paper proposes a new-designed rim seal configuration with sealing holes based on the conventional radial rim seal,and presents a numerical comparison of the sealing performance between the conventional sealing flow supply configuration and the new sealing flow supply configuration with holes at different sealing flow *** sealing effectiveness and unsteady flow yields at the rim seal are numerically simulated by using the URANS method and SST turbulent model from ANSYS *** influence of the new sealing flow supply configuration on the sealing effectiveness at different sealing flow rates is *** effectiveness of different sealing flow rates in the conventional rim seal is also *** to the conventional rim seal,the increase in the sealing flow rate reduces the degree of gas ingestion induced by the effect of mainstream ingress at the rim clearance,while the unsteady flow characteristics are enhanced,and the number and amplitude of the low-frequency signals *** position of the Kelvin-Helmholtz instabilities vortex structures is left by the increased sealing flow rate,and its strength is *** with the conventional rim seal configuration,the new sealing flow supply configuration with holes could reduce the sealing efficiency by 5.06%at most at sealing flow distribution m_(1):m_(2)=3:1 when Cw=2000,and improve the sealing efficiency by 11.71%at most at sealing flow distribution m_(1):m_(2)=1:1 when Cw=*** shows that the lateral jet from the holes induces a larger-scale Kelvin-Helmholtz vortex structure at Cw=2000,thus the sealing efficiency in the wheel space is also ***,the size of the Kelvin-Helmholtz vortex structures is significantly suppressed by the new sealing flow supply configuration at Cw=7500,which is beneficial to improving the sealing effectiveness of the conventional rim seal.

关键词： secondary air system rim seal ingestion and seal unsteady flow discrete sealing holes

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