Flow Analysis of Augmented High-Lift Systems

Radespiel, Rolf; Pfingsten, K. C.; Jensch, Christoph

doi:10.1007/978-3-540-95998-4_10

Cited by 29 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This blowing configuration resulted from extensive design studies aimed at reducing the needed blowing momentum for a given increase of maximum lift. These studies are described in detail by Radespiel et al [9] and Pfingsten et al [10,11]. …”

Section: A Bnf Research Configurationmentioning

confidence: 99%

Aerodynamic Effects of Propeller Slipstream on a Wing with Circulation Control

Beck

Radespiel

Lenfers

et al. 2015

Journal of Aircraft

View full text Add to dashboard Cite

The German Bürgernahes Flugzeug (Citizen-Oriented Airplane) research program advances technologies for high-lift systems using circulation control Coandă-type flaps. The interaction of these high-lift systems with a propeller engine is the subject of the present work. A large and complex wind-tunnel model equipped with an active high-lift system and a powered propeller was designed, manufactured and instrumented. The wind-tunnel data show the potentials of the active high-lift system in three-dimensional wing applications. The results characterize and quantify the interactions between a propeller and a high-lift wing by using systematic variations of blowing momentum and propeller thrust. The results represent a unique database for future efforts to improve the efficiency of active lift and for validation of numerical simulation methods.

show abstract

Section: A Bnf Research Configurationmentioning

confidence: 99%

Aerodynamic Effects of Propeller Slipstream on a Wing with Circulation Control

Beck

Radespiel

Lenfers

et al. 2015

Journal of Aircraft

View full text Add to dashboard Cite

show abstract

“…Circulation control wing (CCW) technology is known to be beneficial in increasing the bound circulation and hence the sectional lift coefficient of airfoil. This technology has been extensively investigated both experimentally and numerically [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][29][30][31][32]] over many years. Circulation control is implemented by tangentially blowing a small high-velocity jet over a highly curved surface, such as a rounded TE.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Flow control for enhanced aerodynamic performance has taken advantage of various techniques, such as the use of jets (continuous, synthetic, pulsed, etc. ), compliant surface, vortex cell, and the like [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. These active control concepts can dramatically alter the behavior of aerodynamic components such as airfoils, wings, and bodies.…”

Section: Introductionmentioning

confidence: 99%

Computational Study on the Aerodynamic Performance of Wind Turbine Airfoil Fitted with Coandă Jet

Djojodihardjo¹,

Hamid²,

Jaafar³

et al. 2013

Journal of Renewable Energy

View full text Add to dashboard Cite

Various methods of flow control for enhanced aerodynamic performance have been developed and applied to enhance and control the behavior of aerodynamic components. The use of Coandă effect for the enhancement of circulation and lift has gained renewed interest, in particular with the progress of CFD. The present work addresses the influence, effectiveness, and configuration of Coandă-jet fitted aerodynamic surface for improving lift andL/D, specifically for S809 airfoil, with a view on its incorporation in the wind turbine. A simple two-dimensional CFD modeling usingk-ɛturbulence model is utilized to reveal the key elements that could exhibit the desired performance for a series of S809 airfoil configurations. Parametric study performed indicates that the use of Coandă-jet S809 airfoil can only be effective in certain range of trailing edge rounding-off radius, Coandă-jet thickness, and momentum jet size. The location of the Coandă-jet was found to be effective when it is placed close to the trailing edge. The results are compared with experimental data for benchmarking. Three-dimensional configurations are synthesized using certain acceptable assumptions. A trade-off study on the S809 Coandă configured airfoil is needed to judge the optimum configuration of Coandă-jet fitted Wind-Turbine design.

show abstract

“…Circulation control wing (CCW) technology is known to be beneficial in increasing the bound circulation and hence the sectional lift coefficient of airfoil. This technology has been extensively investigated both experimentally and numerically [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] over many years. Circulation control is implemented by tangentially blowing a small high-velocity jet over a highly curved surface, such as a rounded trailing edge.…”

Section: Problem Formulationmentioning

confidence: 99%

“…The interest in the use of flow control for enhanced aerodynamic performance has grown, in particular the use of jets (continuous, synthetic, pulsed, etc.) [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. It is widely documented that these active control concepts can dramatically alter the behavior of aerodynamic components such as airfoils, wings, and bodies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Analysis of Coanda Effect Circulation Control for Wind-Turbine Application Considerations

Hamid¹

2011

IIUMEJ

View full text Add to dashboard Cite

In the efforts to investigate the performance of Coanda Jet in enhancing lift of an airfoil, a numerical study is carried out. Tangential jets that take advantage of Coanda effect to closely follow the contours of the body are considered to be simple and particularly effective in that they can entrain a large mass of surrounding air. This can lead to increased circulation in the case of airfoils, or drag reduction (or drag increase if desired) in the case of bluff bodies such as an aircraft fuselage. Critical review and analysis is also carried out for the application of Coanda Jet to optimize the aerodynamic performance of wind turbine, using the results of the numerical study and taking advantage of recent efforts to introduce Coanda effect as a novel circulation control technique. For this purpose a simple two-dimensional CFD modeling is utilized to reveal the key elements that could exhibit the desired performance criteria, in particular the lift enhancement and drag reduction, or a combination of both. Three dimensional configurations will be synthesized using certain acceptable assumptions, to compare such results with existing experimental data. Hence in this work the problem is idealized as basic airflow over a two-dimensional airfoil in subsonic flow; by the use of CFD technique, parametric study is carried out to arrive at plausible design considerations and to assess the practicability of Coanda jet in wind turbine design. Parametric study carried out shows the effectiveness of Coanda-jet in producing enhanced lift, which can contribute to increased torque in wind turbine application and increased axial thrust for propeller application. The numerical study also shows that appropriate trailing edge rounding off and tailoring the Coanda-jet thickness and momentum coefficient can produce enhanced lift to drag ratio.ABSTRAK : Dalam usaha untuk mengkaji prestasi Coanda Jet bagi mempertingkatkan daya angkat suatu aerofil, kajian berangka telah dijalankan. Tangen jet yang mengambil manfaat efek Coanda mengikut kontur permukaan dianggap mudah dan berkesan kerana ia dapat mengiring satu jisim besar udara sekeliling. Ini mendorong kepada penambahan edaran udara dalam kes aerofil, atau penurunan seret (juga penambahan seret jika diingini) dalam kes jasad tubir seperti fiuslaj pesawat. Ulasan kritikal dan analisis telah dijalankan bagi aplikasi Coanda Jet untuk mengoptimumkan prestasi aerodinamik turbin angin, menggunakan keputusan kajian berangka dan mengambil manfaat usaha memperkenalkan penggunaan efek Coanda sebagai satu teknik pengawalan edaran udara. Untuk tujuan ini, permodelan dua dimensi CFD telah digunakan untuk mendedahkan punca utama elemen yang dapat mededahkan kriteria prestasi yang diingini, khususnya peningkatan daya angkat dan penurunan seret, ataupun kombinasi kedua-duanya. Konfigurasi tiga dimensi akan disintesis menggunakan beberapa andaian yang boleh diterima, untuk membandingkan keputusan tersebut dengan data eksperimental yang sedia ada. Permasalahan dalam kajian ini diunggulkan sebagai aliran udara asas subsonik di atas aerofil dua dimensi; dengan menggunakan teknik CFD, kajian berparameter dijalankan untuk mendapat reka bentuk yang munasabah, dan mengkaji kebolehlaksanaan Coanda jet dalam reka bentuk turbin angin. Kajian berparameter menunjukkan keberkesanan Coanda-jet dalam menghasilkan peningkatan daya angkat, justeru menyumbangkan kepada peningkatan daya kilas dalam aplikasi turbin angin, dan juga penambahan tujah paksi dalam aplikasi bebaling. Kajian berangka ini juga menunjukkan pembundaran pinggir mengekor, pemilihan ketebalan Coanda-jet dan pekali momentum yang sesuai, akan menghasilkan peningkatan nisbah daya angkat terhadap seretan.

show abstract

Flow Analysis of Augmented High-Lift Systems

Cited by 29 publications

References 14 publications

Aerodynamic Effects of Propeller Slipstream on a Wing with Circulation Control

Aerodynamic Effects of Propeller Slipstream on a Wing with Circulation Control

Computational Study on the Aerodynamic Performance of Wind Turbine Airfoil Fitted with Coandă Jet

Numerical Simulation and Analysis of Coanda Effect Circulation Control for Wind-Turbine Application Considerations

Contact Info

Product

Resources

About