International Journal of Turbomachinery, Propulsion and Power最新文献_第10页

Preliminary Design Guidelines for Considering the Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding 考虑低速轴流风机叶型涡脱落引起的振动和噪声的初步设计准则

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-01-07 DOI: 10.3390/ijtpp7010002

G. Daku, J. Vad

引用次数: 0

Numerical Steady and Transient Evaluation of a Confined Swirl Stabilized Burner 受限旋流稳定燃烧器的数值稳态和瞬态评估

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-11-30 DOI: 10.3390/ijtpp6040046

Federica Farisco, L. Castellanos, J. Woisetschläger, W. Sanz

{"title":"Numerical Steady and Transient Evaluation of a Confined Swirl Stabilized Burner","authors":"Federica Farisco, L. Castellanos, J. Woisetschläger, W. Sanz","doi":"10.3390/ijtpp6040046","DOIUrl":"https://doi.org/10.3390/ijtpp6040046","url":null,"abstract":"Lean premixed combustion technology became state of the art in recent heavy-duty gas turbines and aeroengines. In combustion chambers operating under fuel-lean conditions, unsteady heat release can augment pressure amplitudes, resulting in component engine damages. In order to achieve deeper knowledge concerning combustion instabilities, it is necessary to analyze in detail combustion processes. The current study supports this by conducting a numerical investigation of combustion in a premixed swirl-stabilized methane burner with operating conditions taken from experimental data that were recently published. It is a follow-up of a previous paper from Farisco et al., 2019 where a different combustion configuration was studied. The commercial code ANSYS Fluent has been used with the aim to perform steady and transient calculations via Large Eddy Simulation (LES) of the current confined methane combustor. A validation of the numerical data has been performed against the available experiments. In this study, the numerical temperature profiles have been compared with the measurements. The heat release parameter has been experimentally and numerically estimated in order to point out the position of the main reaction zone. Several turbulence and combustion models have been investigated with the aim to come into accord with the experiments. The outcome showed that the combustion model Flamelet Generated Manifold (FGM) with the k-ω turbulence model was able to correctly simulate flame lift-off.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45304128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transport of Swirling Entropy Waves through an Axial Turbine Stator 涡流熵波通过轴向涡轮定子的传输

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-11-26 DOI: 10.3390/ijtpp6040045

A. Notaristefano, P. Gaetani

引用次数: 1

Data Driven Modal Decomposition of the Wake behind an NREL-5MW Wind Turbine NREL-5MW风力发电机尾流的数据驱动模态分解

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-11-25 DOI: 10.3390/ijtpp6040044

S. Cherubini, G. De Cillis, Onofrio Semeraro, S. Leonardi, P. De Palma

{"title":"Data Driven Modal Decomposition of the Wake behind an NREL-5MW Wind Turbine","authors":"S. Cherubini, G. De Cillis, Onofrio Semeraro, S. Leonardi, P. De Palma","doi":"10.3390/ijtpp6040044","DOIUrl":"https://doi.org/10.3390/ijtpp6040044","url":null,"abstract":"The wake produced by a utility-scale wind turbine invested by a laminar, uniform inflow is analyzed by means of two different modal decompositions, the proper orthogonal decomposition (POD) and the dynamic mode decomposition (DMD), in its sparsity-promoting variant. The turbine considered is the NREL-5MW at tip-speed ratio λ=7 and a diameter-based Reynolds number of the order 108. The flow is simulated through large eddy simulation, where the forces exerted by the blades are modeled using the actuator line method, whereas tower and nacelle are modeled employing the immersed boundary method. The main flow structures identified by both modal decompositions are compared and some differences emerge that can be of great importance for the formulation of a reduced-order model. In particular, a high-frequency mode directly related to the tip vortices is found using both methods, but it is ranked differently. The other dominant modes are composed by large-scale low-frequency structures, but with different frequency content and spatial structure. The most energetic 200 POD modes account for ≈20% only of the flow kinetic energy. While using the same number of DMD modes, it is possible to reconstruct the flow field to within 80% accuracy. Despite the similarities between the set of modes, the comparison between these modal-decomposition techniques points out that an energy-based criterion such as that used in the POD may not be suitable for formulating a reduced-order model of wind turbine wakes, while the sparsity-promoting DMD appears able to perform well in reconstructing the flow field with only a few modes.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42884128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Experimental and Numerical Analysis of a Compressor Stage under Flow Distortion 压气机级在流动畸变作用下的实验与数值分析

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-11-23 DOI: 10.3390/ijtpp6040043

A. Baretter, B. Godard, P. Joseph, O. Roussette, F. Romanò, R. Barrier, A. Dazin

{"title":"Experimental and Numerical Analysis of a Compressor Stage under Flow Distortion","authors":"A. Baretter, B. Godard, P. Joseph, O. Roussette, F. Romanò, R. Barrier, A. Dazin","doi":"10.3390/ijtpp6040043","DOIUrl":"https://doi.org/10.3390/ijtpp6040043","url":null,"abstract":"On many occasions, fan or compressor stages have to face azimuthal flow distortion at inlet, which affects their performance and stability. These flow distortions can be caused by external events or by some particular geometrical features. The aim of this work is to propose a joined numerical and experimental analysis of the flow behavior in a single axial compressor stage under flow distortion. The distortions are generated by different grids that are placed upstream to the rotor. Experimentally, the flow analysis is based on the measurements obtained by a series of unsteady pressure sensors flush-mounted at the casing of the machine rotor. URANS computations are conducted using the elsA software. The flow distortion is simulated by a drop of stagnation pressure ratio at the inlet boundary condition. The study is focusing first on the ability of a pressure drop, imposed as an inlet boundary condition in CFD, to reproduce accurately the effect of a flow distortion. The analysis is conducted using singular value decomposition (SVD) and dynamic mode decomposition (DMD). A special attention is then paid, on the experimental level, to the arising of rotating stall, from the onset of the instability up to completely developed stall cells.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44731904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Turbine Broadband Noise Predictions Using Linearised Frequency Domain Navier-Stokes Solvers 利用线性化频域Navier-Stokes解算器预测涡轮宽带噪声

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-11-12 DOI: 10.3390/ijtpp6040042

Ricardo Blázquez-Navarro, R. Corral

引用次数: 2

The High-Speed Cascade Wind Tunnel at the Bundeswehr University Munich after a Major Revision and Upgrade 德国慕尼黑联邦国防军大学的高速梯级风洞

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-10-29 DOI: 10.3390/ijtpp6040041

R. Niehuis, M. Bitter

引用次数: 4

Experimental Study of the Leakage Flow in an Axial-Flow Fan at Variable Loading 轴流风机变负荷泄漏流的实验研究

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-10-20 DOI: 10.3390/ijtpp6040040

E. Canepa, A. Cattanei, M. Moradi, A. Nilberto

引用次数: 0

Machine Learning Based Sensitivity Analysis of Aeroelastic Stability Parameters in a Compressor Cascade 基于机器学习的压气机叶栅气动弹性稳定性参数敏感性分析

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-09-15 DOI: 10.3390/ijtpp6030039

Marco Rauseo, M. Vahdati, F. Zhao

{"title":"Machine Learning Based Sensitivity Analysis of Aeroelastic Stability Parameters in a Compressor Cascade","authors":"Marco Rauseo, M. Vahdati, F. Zhao","doi":"10.3390/ijtpp6030039","DOIUrl":"https://doi.org/10.3390/ijtpp6030039","url":null,"abstract":"Aeroelastic instabilities such as flutter have a crucial role in limiting the operating range and reliability of turbomachinery. This paper offers an alternative approach to aeroelastic analysis, where the sensitivity of aerodynamic damping with respect to main flow and structural parameters is quantified through a surrogate-model-based investigation. The parameters are chosen based on previous studies and are represented by a uniform distribution within applicable intervals. The surrogate model is an artificial neural network, trained and tested to achieve an error within 1% of the test data. The quantity of interest is aerodynamic damping and the datasets are obtained from a linearised aeroelastic solver. The sensitivity of aerodynamic damping with respect to the input variables is obtained by calculating normalised gradients from the surrogate model at specific operating conditions. The results show a quantitative comparison of sensitivity across the different input parameters. The outcome of the sensitivity analysis is then used to decide the most appropriate action to take in order to induce stability in unstable operating conditions. The work is a preliminary study, carried out on a simplified two dimensional compressor cascade and it is aimed at proving the validity of a data-driven approach in studying the aeroelastic behaviour of turbomachinery. To the best of the authors’ knowledge, this is the first time a data-driven flutter model has been investigated. The initial results are encouraging, indicating that this approach is worth pursuing in the future. The presented framework can be used as a redesign tool to enhance the flutter stability of an existing blade.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42403946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design Parameter Influence on Losses and Downstream Flow Field Uniformity in Supersonic ORC Radial-Inflow Turbine Stators 超声速ORC径向入流涡轮定子设计参数对损失及下游流场均匀性的影响

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2021-09-06 DOI: 10.3390/ijtpp6030038

A. Cappiello, R. Tuccillo

{"title":"Design Parameter Influence on Losses and Downstream Flow Field Uniformity in Supersonic ORC Radial-Inflow Turbine Stators","authors":"A. Cappiello, R. Tuccillo","doi":"10.3390/ijtpp6030038","DOIUrl":"https://doi.org/10.3390/ijtpp6030038","url":null,"abstract":"The design of organic Rankine cycle (ORC) turbines often requires dealing with transonic flows due to the cycle efficiency requirements and the matching of the temperature profiles with heat sources and sinks, as well as the nature of organic fluids, often featuring high molecular weight. Consequently, the use of convergent–divergent turbine stators has been widely established as a solution in the published literature for use in both axial- and radial-inflow machines. With respect to the latter layout in particular, the available design guidelines are still limited. The present work shows the results of an investigation into a series of ORC radial-inflow convergent–divergent nozzles that differ with respect to the vane count and the designed metal angle of the outlet. These stators were designed by fitting the divergent portion of a sharp-edged minimum-length nozzle, designed by means of the method of characteristics (MoC) adapted to dense gases, into a radial-inflow turbine stator. The geometries were analysed by means of steady-state RANS CFD calculations, and the results were used to assess the influence of the design parameters on the nozzle losses and downstream flow field uniformity, showing that conflicting trends exist between optimum stator efficiency and optimum downstream flow field uniformity.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42378305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1