Investigation of the Magnus Effect of a Generic Projectile at Mach 3 Up to 16 Degrees Angle of Attack

Klatt, Daniel; Hruschka, R.; Leopold, Friedrich

doi:10.1115/1.4023434

Cited by 13 publications

(19 citation statements)

References 17 publications

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“…Moreover, the body Magnus force increases first and then decreases with angle of attack. Klatt et al (2014) proposed that the generation and distortion of the secondary vortices are responsible for this phenomenon. However, the angle of attack was limited in 16°, and the rapid decrease of the Magnus force at large angle of attack was not explained.…”

Section: Transient Lateral Force and Time-averagedmentioning

confidence: 99%

“…Predicting the Magnus effect accurately and investigating its flow mechanism are what researches have been longing for. CONTACT Xiaosheng Wu wxs171@sina.com During the past few decades, the Magnus effect of nonfinned projectile has been studied by many researchers (Despirito & Plostins, 2007;Fletcher, 1972;Klatt, Hruschka, & Leopold, 2012, 2014Nietubicz & Opalka, 1980;Silton, 2005;Simon, Deck, Guillen, Merlen, & Cayzac, 2009). The previous work indicates that the boundary layer distortion is the main source of the Magnus effect at small angles of attack, and that the asymmetrical flow separation on the projectile surface directly influences the Magnus effect at large angles of attack.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, wind tunnel tests measure the aerodynamic characteristics of the whole projectile, while the relationships between unsteady flow structures and aerodynamic characteristics are difficult to determine. (Despirito & Plostins, 2007;Fletcher, 1972;Klatt et al, 2012Klatt et al, , 2014Nietubicz & Opalka, 1980;Silton, 2005;Simon et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Body-fin interference on the Magnus effect of spinning projectile in supersonic flows

Yin

Lei

2017

Engineering Applications of Computational Fluid Mechanics

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The numerical simulations of flow over a spinning finned projectile at angles of attack ranging from 4 • to 30.3 • in supersonic conditions were carried out to investigate the flow mechanism of the Magnus effect. The finite volume method, a dual-time stepping method, and a γ − Re θ transition model were combined to solve the Reynolds-averaged Navier-Stokes (RANS) equations. The validation of temporal resolution, grid independence, and turbulence models were conducted for the accuracy of the numerical method. The numerical results were in certain agreement with archival experimental data. A comparison of the transient lateral force and time-averaged Magnus force between the body of finned projectile and the nonfinned body, the projectile fin and single fin was given. The key lies in the analysis of the reasons for the production of the Magnus force. The simulation provided a profound insight into the flow structure and revealed the following. The fin leading edge shock contributes to the unsteady interference on body lateral force, while the time-averaged body Magnus force is similar to that of the nonfinned body. At α = 30.3 • , the shielding effect of body on crossflow weakens the time-averaged body Magnus force induced by asymmetrical flow separation, the magnitude of which is reduced to the value at α = 8 • . The leeward separation vortices and the resistance on wingroot flow are responsible for the nonlinear interference of the projectile body on fin Magnus force at different angles of attack. When the low pressure region of the vortex core is equivalent to the size and position of fin, leeward separation vortices contribute more the time-averaged Magnus force and induce high frequency variation to the transient fin lateral force. ARTICLE HISTORY

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Section: Transient Lateral Force and Time-averagedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Body-fin interference on the Magnus effect of spinning projectile in supersonic flows

Yin

Lei

2017

Engineering Applications of Computational Fluid Mechanics

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“…These may include the surface fineness, AoA, Mach number, Reynolds number, spin rate or projectile geometry. The work already done provides a detailed database of Magnus force calculation, whether it be the wind-tunnel-mounted projectiles testing (3,4) ; free-flight experiments, which were extensively conducted by U.S. Army Ballistic Research Laboratory (5)(6)(7)(8)(9) ; empirical modeling (10,11) ; or the numerical analysis (1,2,(12)(13)(14) . How the Magnus force and moment varies with Mach number, AoA, AoS and spin rate from subsonic to supersonic speeds, cross-sectional variation in pressure distribution with respect to AoA, visualization of vortex core ripples due to interaction of opposite flows, resonant frequency oscillations and FFT-based spectral analysis of nutation and precession frequencies dependencies on Magnus force/moment, are yet to be elaborated and are the scope of this paper.…”

Section: Introductionmentioning

confidence: 99%

Unsteady aerodynamics computation and investigation of magnus effect on computed trajectory of spinning projectile from subsonic to supersonic speeds

Chughtai¹,

Masud²,

Akhtar

2019

Aeronaut. j.

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This paper describes the extensive numerical investigation carried out on a 203-mm spin-stabilised projectile to study the effects of Magnus force at high angles of attack on the stability and flight-trajectory parameters, for further validation and incorporation in a 6-DOF trajectory solver for flight-stability analysis. Magnus force typically influences the course of flight by causing the projectile to drift from its intended path in addition to generation of inbuilt dynamic instabilities in pitch and yaw orientation and is a function of AoA and spin rate. This study is a consolidation of the authors’ previous research on the same caliber projectile but with time-accurate analysis. It has been found that typically, the Magnus force and moment calculation requires time-accurate Navier Stokes equations to be solved numerically for accurate prediction(1,2). Hence, to complete the extraction of static and dynamic coefficients derivatives, unstructured time-accurate CFD analysis on multiple configurations, ranging from subsonic to supersonic Mach regimes, has been evaluated using Large Eddy Simulation (LES) and found to be suitable for capturing the desired effects. However, the LES simulation requires non-dimensional wall distance (y+) of the order of 0.5 – 1, with LES_IQ > 75% thus, is computationally-intensive. In addition, to cover the entire flight envelope from Charge 1 (249 m/s) to Charge 7 (595 m/s), at spin rate from 500 rad/s to 750 rad/s, 30 cases have been evaluated to generate the time-accurate coefficient library for integration with 6-DOF solver analysis. The results obtained have been compared with the available experimental data and found to be in reasonable agreement. The results of 6-DOF solver, incorporating the extracted coefficients, were compared with firing-table results, which further validated the computational methodology. This study provides an insight on how opposite flow interacts with the attached boundary layer due to spin rate and generates a turbulent interacting flow with variation in vortical structures for Q-Criterion vortex-flow visualization.

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“…Thirdly, through the analysis of Chinese wrestling athletes (Pavez, 2016), we need to strengthen the coaches and athletes to the recognition of the importance of the secondary attack. A single technology of modern wrestling does not produce an ideal effect of scoring, and the application of the subsequent continuous action will have more advantages in the game (Klatt, 2013).…”

Section: Introductionmentioning

confidence: 99%

The Application Research of Secondary Attack Tactics in Freestyle Wrestling Sports

Sui¹

2017

j comput theor nanosci

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First of all, through the analysis to the characteristics of secondary attack of the Chinese wrestling athletes in the game, I do some preparation for analysing the technical differences of the wrestling athletes at home and abroad. This is good for shortening the differences in related research between the wrestlers at home and powerful elite athletes at abroad. Secondly, this study can highlight the position and role of the secondary attack in the wrestling sports. Game experience in the past has shown that secondary attack in wrestling sports is a kind of technique with high frequency in success. Therefore, the study of the secondary attack can stimulate the coaches and athletes to the importance of this kind of technique, and to improve training in the wrestling for the second attack. In addition, the practice has proved that at the contemporary wrestling competition is increasingly fierce both at home and abroad, and the use of a single technique is not enough to win the game. The study of the secondary attack will be one of the important link of wrestling technique.

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Investigation of the Magnus Effect of a Generic Projectile at Mach 3 Up to 16 Degrees Angle of Attack

Cited by 13 publications

References 17 publications

Body-fin interference on the Magnus effect of spinning projectile in supersonic flows

Body-fin interference on the Magnus effect of spinning projectile in supersonic flows

Unsteady aerodynamics computation and investigation of magnus effect on computed trajectory of spinning projectile from subsonic to supersonic speeds

The Application Research of Secondary Attack Tactics in Freestyle Wrestling Sports

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