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International Journal of Turbo & Jet-Engines最新文献

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Virtual deflection with synthetic jet actuators at high angles of attack 合成射流致动器在大攻角下的虚拟偏转
4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-10-05 DOI: 10.1515/tjj-2023-0049
Nihal Dalwadi, Dipankar Deb, Gautam Choubey, Mrinal Kaushik, Debi Prasad Mishra
{"title":"Virtual deflection with synthetic jet actuators at high angles of attack","authors":"Nihal Dalwadi, Dipankar Deb, Gautam Choubey, Mrinal Kaushik, Debi Prasad Mishra","doi":"10.1515/tjj-2023-0049","DOIUrl":"https://doi.org/10.1515/tjj-2023-0049","url":null,"abstract":"Abstract A hybrid drone called a biplane quadrotor operates in both low (during the horizontal flight) and high (transition maneuver) Angle of Attack (AoA). So, this paper focuses on enhancing aerodynamic force during the transition maneuver. Synthetic Jet actuators (SJAs) can modify airfoil shapes virtually, so either the flow reattaches or flow separation will be delayed. This delay can enhance the aerodynamic force. In this paper, CFD analysis is performed using Ansys Fluent to study the impact of SJA on NACA 0015 airfoil at high (30°) AoA. This study aims to find the best location of SJA for high AoA to get maximum lift enhancement. The outcome of this study reveals that at 85 %, we can get maximum enhancement in the lift.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134948107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Endwall heat transfer in wedge channel with teardrop pin fins, circular fins and oblong pin fins 带泪滴式、圆形和长方形三种翅片的楔形通道端壁换热
4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-29 DOI: 10.1515/tjj-2023-0076
Goveraiahgari Venkatesh, Reddygari Meenakshi Reddy, Pabbisetty Mallikarjuna Rao
{"title":"Endwall heat transfer in wedge channel with teardrop pin fins, circular fins and oblong pin fins","authors":"Goveraiahgari Venkatesh, Reddygari Meenakshi Reddy, Pabbisetty Mallikarjuna Rao","doi":"10.1515/tjj-2023-0076","DOIUrl":"https://doi.org/10.1515/tjj-2023-0076","url":null,"abstract":"Abstract The turbine inlet air temperatures exhibit a significant degree of elevation, hence leading to potential adverse consequences such as the degradation of blade material integrity. Consequently, the necessity to cool the turbine blades has arisen, leading to the implementation of various cooling systems. This study aims to conduct a comparative analysis of three different types of pin fins, namely oblong, circular, and teardrop, in a wedge duct. The range of Reynolds number considered for the analysis is between 10,000 and 70,000, whereas the pin fins and endwalls are subjected to a uniform heat flux of 3280 W/m 2 . The findings suggest that the friction factor associated with teardrop pin fins is 28.4 % lesser than circular pin fins and when compared to oblong pin fins; it is reduced by 34.5 %. The findings suggest that the friction factor associated with teardrop pin fins is 14 % lower compared to oblong and circular pin fins. The TPF improves with Re, and it is 24.5 % higher than oblong pin fin geometry and 39.2 % higher than circular shaped pin fins.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135199875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aerothermal effects of squealer openings on a cavity tip in a turbine cascade 涡轮叶栅空腔顶端的气动热效应
4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-25 DOI: 10.1515/tjj-2023-0066
Zuhao Liu, Yi Cao, Chao Zhou, Zhiyuan Cao
{"title":"Aerothermal effects of squealer openings on a cavity tip in a turbine cascade","authors":"Zuhao Liu, Yi Cao, Chao Zhou, Zhiyuan Cao","doi":"10.1515/tjj-2023-0066","DOIUrl":"https://doi.org/10.1515/tjj-2023-0066","url":null,"abstract":"Abstract Both the aerodynamic and thermal performance are important for a high-pressure turbine design. This paper investigates aerothermal effects of opening on the suction side squealer of a cavity tip in a turbine cascade. There are four cases investigated, ‘Cavity’, ‘Opening 1’, ‘Opening 2’ and ‘Opening 3’. For Opening 1 with an opening area at 15 % axial chord, the opening outflow affects the near-tip flow mainly by interacting with the passage vortex, and the near tip loss increases by less than 3 %. For Opening 2 with an opening area at 12 % axial chord, the near tip loss is lower than Opening 1. By further rounding the edge of the opening area, the loss of the tip with opening is less than 1 % higher than the cavity tip. Nevertheless, the opening tip can achieve a reduction of the thermal load of the suction side squealer inner wall by up to 19 %.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135770722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and combustion characteristics analysis of a static shaft turbofan engine 静轴涡扇发动机设计及燃烧特性分析
4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-13 DOI: 10.1515/tjj-2023-0057
Rong Ma, Herong Jin, Yali Yi, Jingsheng Yang, Xueling Fan
{"title":"Design and combustion characteristics analysis of a static shaft turbofan engine","authors":"Rong Ma, Herong Jin, Yali Yi, Jingsheng Yang, Xueling Fan","doi":"10.1515/tjj-2023-0057","DOIUrl":"https://doi.org/10.1515/tjj-2023-0057","url":null,"abstract":"Abstract A design scheme of a static shaft turbofan engine is proposed to meet the requirements of light weight and large thrust weight ratio of small aeroengine. As the core component of stable combustion, the thermal protection problem of the mid-mounted combustion chamber is particularly prominent. This paper designs a mid-mounted combustion chamber configuration that combines gas film cooling and central combustion. The influence of structural parameters on combustion characteristics is explored by numerical simulation, and the theoretical design and numerical simulation is verified based on combustion test results. The results show that the flame shape of the mid-mounted combustion chamber conforms to the characteristics of central combustion. The combustion effect of the nozzle with spray angle of 45° and flow rate of 1.87 kg/h meets the requirements of secondary combustion of the static shaft turbofan engine, and the air inlet of the combustion liner effectively increases the thickness of the cooling gas film. The experimental results are in good agreement with the numerical simulation results, and the temperature of the combustion liner wall can be reduced effectively. The above research provides a theoretical basis for the combustion chamber design of small static shaft turbofan engines and a reference for the thermal protection methods of small aeroengine combustion chambers.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134990338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of turbulence and flamelet combustion modelling on the CFD simulation of a dual inlet ramjet combustor 湍流和火焰燃烧模型对双进气道冲压发动机燃烧室CFD模拟的影响
4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-12 DOI: 10.1515/tjj-2023-0039
Mehmet Burak Solmaz, Sitki Uslu
{"title":"Effects of turbulence and flamelet combustion modelling on the CFD simulation of a dual inlet ramjet combustor","authors":"Mehmet Burak Solmaz, Sitki Uslu","doi":"10.1515/tjj-2023-0039","DOIUrl":"https://doi.org/10.1515/tjj-2023-0039","url":null,"abstract":"Abstract This manuscript presents Computational Fluid Dynamics simulation of a ramjet combustor using Reynolds Averaged Navier–Stokes approach for turbulence with flamelet combustion modelling. In the approach a one-dimensional premixed flame simulation is performed to cover a wide range of mixture fraction space. After a mesh study, effects of turbulence, Realizable k - ε and SST k - ω , and combustion modelling, Steady Laminar Flamelet and Flamelet Generated Manifold, are investigated in detail. The Flamelet Generated Manifold model that offers a reaction delay by employing an additional progress variable, shows there are no reactions taking place in the vicinity of jet inlets, hence the unrealistic temperature rise that is seen in the case of using Steady Laminar Flamelet is not observed. A study on the choice of progress variable based on the combustion products is carried out. The present study readily demonstrates good predictability of Flamelet Generated Manifold combustion modelling in such a dual inlet ramjet combustion chamber.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135830441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fluid flow in a microdiffuser at small Reynolds numbers 小雷诺数下微扩散器中的流体流动
IF 0.9 4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-08 DOI: 10.1515/tjj-2023-0008
Andriy A. Avramenko, N. P. Dmitrenko, I. V. Shevchuk
{"title":"Fluid flow in a microdiffuser at small Reynolds numbers","authors":"Andriy A. Avramenko, N. P. Dmitrenko, I. V. Shevchuk","doi":"10.1515/tjj-2023-0008","DOIUrl":"https://doi.org/10.1515/tjj-2023-0008","url":null,"abstract":"Abstract The article presents the results of an analytical study of the flow dynamics in a microdiffuser. An expression for the velocity profile is obtained with account for slip effects. The effect of the Knudsen number on the velocity profiles is shown. The effect of the microdiffuser angle on the flow velocity profile and the friction coefficient is analyzed. The opening angle of the microdiffuser was determined, at which slip effects do not affect the velocity profile.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42558297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A study on optimal rotor speed control method for helicopter power system considering the influence of infrared suppressors 考虑红外抑制器影响的直升机动力系统最优旋翼速度控制方法研究
IF 0.9 4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-07 DOI: 10.1515/tjj-2023-0048
Zhaoguang Wang, Jiatong Du, Haoran Guo
{"title":"A study on optimal rotor speed control method for helicopter power system considering the influence of infrared suppressors","authors":"Zhaoguang Wang, Jiatong Du, Haoran Guo","doi":"10.1515/tjj-2023-0048","DOIUrl":"https://doi.org/10.1515/tjj-2023-0048","url":null,"abstract":"Abstract In order to realize the most economical operation of helicopter power system, the optimal rotor speed control method is proposed and designed. Firstly, the simplified performance calculation model of helicopter required power and turboshaft engine are established, which constitute the performance calculation model of helicopter power system together. Then, according to the above model, through applying blade loading constraint and selecting the minimum engine fuel flow as the optimization objective, an integrated optimization method of optimal rotor speed based on golden section method is proposed, which reveals the variation law of optimal rotor speed under different operation conditions. Finally, the numerical simulation and hardware-in-loop (HIL) simulation are conducted separately to validate the optimal rotor speed control method. The results indicate that compared with constant rotor speed operation, optimal rotor speed control method can decrease engine fuel flow by more than 21 %, which proves the significant effectiveness and satisfactory feasibility. The optimal rotor speed control method ensures that the helicopter power system operates at the optimal rotor speed, and is beneficial to reach the most economical cruise target.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42994121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic characteristics of open-ends squeeze film dampers with air ingestion 进气时开口挤压膜阻尼器的动态特性
IF 0.9 4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-09-05 DOI: 10.1515/tjj-2023-0032
Zhenhuan Tang, X. Chen, Hailun Zhou, Yu Lu, Hongbin He
{"title":"Dynamic characteristics of open-ends squeeze film dampers with air ingestion","authors":"Zhenhuan Tang, X. Chen, Hailun Zhou, Yu Lu, Hongbin He","doi":"10.1515/tjj-2023-0032","DOIUrl":"https://doi.org/10.1515/tjj-2023-0032","url":null,"abstract":"Abstract In order to explore the air ingestion characteristics of the open-ends squeeze film dampers (SFD), a 3D computational fluid dynamics solution model of the SFD was proposed based. The setting of opening boundary conditions was considered, which was verified experimentally by the bidirectional excitation. The results revealed that with the same precession frequency, the smaller radial clearance leads to the greater oil film damping. An increasing oil supply and oil holes led to the smaller air ingestion range at the end. The design guideline for the open-ends SFD was investigated in the present work.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47515299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on one-dimensional performance prediction of multi-stage axial turbine based on the blade height 基于叶片高度的多级轴流涡轮一维性能预测研究
IF 0.9 4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-08-31 DOI: 10.1515/tjj-2023-0058
Kefang Xu, Ze Yuan, Zhaojun Li, G. Yue
{"title":"Study on one-dimensional performance prediction of multi-stage axial turbine based on the blade height","authors":"Kefang Xu, Ze Yuan, Zhaojun Li, G. Yue","doi":"10.1515/tjj-2023-0058","DOIUrl":"https://doi.org/10.1515/tjj-2023-0058","url":null,"abstract":"Abstract As turbine operating conditions change, the blade height and tip clearance undergo continuous alterations due to the combined effects of thermal stress, aerodynamic forces and centrifugal forces, subsequently influencing the turbine performance. To take this effect into account in turbine performance prediction, this study considers the influence of fluid-heat-structure coupling on blade height and tip clearance and establishes a one-dimensional comprehensive prediction method for multi-stage axial turbine performance considering blade height. When compared with experimental results from a four-stage axial turbine, by considering the fluid-thermal-solid coupling effects, the average relative error in total pressure ratio prediction is reduced from 3.76 % to 1.99 % and the average relative error in total temperature ratio prediction is reduced from 2.03 % to 1.26 %. Compared with the traditional flow prediction method, the prediction results of turbine characteristics considering blade height and tip clearance changes in this paper are closer to the experimental results.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48196291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In-service load calculation surrogate models for high-pressure turbine blade life digital twin 高压汽轮机叶片寿命数字孪生的在役负荷计算替代模型
IF 0.9 4区 工程技术
International Journal of Turbo & Jet-Engines Pub Date : 2023-08-30 DOI: 10.1515/tjj-2023-0040
Chunhua Li, Jianzhong Sun, Bowen Wang, Jinchen Nian
{"title":"In-service load calculation surrogate models for high-pressure turbine blade life digital twin","authors":"Chunhua Li, Jianzhong Sun, Bowen Wang, Jinchen Nian","doi":"10.1515/tjj-2023-0040","DOIUrl":"https://doi.org/10.1515/tjj-2023-0040","url":null,"abstract":"Abstract There are developed methods for high-pressure turbine (HPT) blade loads and remaining useful life (RUL) prediction; however, they are ineffective and time-consuming for in-service HPT blades under actual operating conditions. Hence, it is necessary to use an acceptable computational effort to predict the HPT blade’s load and in-service lifetime. Drawing from the idea of the usage-based life (UBL) prediction method, this paper first proposes a framework for the life digital twin (LDT) to characterize and track the in-service life consumption of the HPT blades under actual operating conditions. The second work mainly focuses on developing the steady-state and transient load calculation surrogate models for the HPT blade’s LDT. Using the developed surrogate models, it can now calculate the steady-state and transient loads of the HPT blade in an acceptable time with the necessary accuracy. The proposed approach is demonstrated on an HPT blade of a typical commercial turbofan engine. Because the operating load of the HPT blade severely affects its in-service lifetime, the application of this approach enables the construction of an LDT of the HPT blade. It can reduce the uncertainty and variability associated with the in-service life prediction of the HPT blade under actual operating conditions.","PeriodicalId":50284,"journal":{"name":"International Journal of Turbo & Jet-Engines","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49595165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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