Experimental study on the wake fields of a Panamax Bulker based on stereo particle image velocimetry

Guo, Chunyu; Wu, Tiecheng; Luo, Wanzhen; Chang, Xin; Gong, Jie; She, Weilong

doi:10.1016/j.oceaneng.2018.07.037

Cited by 19 publications

(19 citation statements)

References 22 publications

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“…(3) Data averaging: We averaged the data set containing 90 vector fields in order to obtain final results containing velocity and scalar information. The "good" vectors and "bad" vectors within the interrogation region were not evaluated, the local validation algorithm along with the adaptive correlation was employed so that viewed on all the calculation process [33][34][35], hence less "bad" vectors are generated. The sample image that shows the particle density is presented in Figure 14.…”

Section: Resultsmentioning

confidence: 99%

Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran

Sun

Guo

Wang

et al. 2020

JMSE

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The interactions between the main hull and demi-hull of trimarans have been arousing increasing attention, and detailed circumferential flow fields greatly influence trimaran research. In this research, the unsteady wake flow field of a trimaran was obtained by Reynolds-Averaged Navier-Stokes (RANS) equations on the basis of the viscous flow principles with consideration of the heaving and pitching of the trimaran. Then, we designed an experimental method based on particle-image velocimetry (PIV) and obtained a detailed flow field between the main hull and demi-hull of the trimaran. A trimaran model with one demi-hull made of polycarbonate material with 90% light transmission rate and a refractive index 1.58 (close to that of water 1.33) was manufactured as the experiment sample. Using polycarbonate material, the laser-sheet light-source transmission and high-speed camera recording problems were effectively rectified. Moreover, a nonstandard calibration was added into the PIV flow field measurement system. Then, we established an inverse three-dimensional (3D) distortion coordinate system and obtained the corresponding coordinates by using optics calculations. Further, the PIV system spatial mapping was corrected, and the real flow field was obtained. The simulation results were highly consistent with the experimental data, which showed the methods established in this study provided a strong reference for obtaining the detailed flow field information between the main hull and demi-hull of trimarans.

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Section: Resultsmentioning

confidence: 99%

Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran

Sun

Guo

Wang

et al. 2020

JMSE

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“…The uncertainty analysis of PIV is mainly divided into two aspects: one is the measurement of the reference flow field to evaluate the accuracy of the measurement method; the other is repeated measurements under the same working condition to determine the mean square error of measurement. The detailed uncertainty analysis process can be referred to the author's literature [16,17]. In the PIV measurement process in this paper, the number of instantaneous velocity samples that were collected for each towing is 250 and the corresponding measurement accuracy is 2.5%.…”

Section: Piv Measurement Designmentioning

confidence: 99%

“…The phase-averaged mean velocity shows that the trailing vorticity was related to radial velocity jump. Guo and Gong [16,17] used PIV to test the fine flow field of bulk carrier and waterjet-propeller ship in the towing tank, and the uncertainty of measurement was analyzed. Aiming at the uncertainty factors of PIV in towing tank, Falchi and Felli [18,19] generally analyze and explain the uncertainty of PIV measurement system itself.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Interactions between Bracket and Propeller of Podded Propulsor Based on Particle Image Velocimetry Test

Zhao

Guo

et al. 2019

Water

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In this study, particle image velocimetry was used to measure the fine flow-field characteristics of an L-type podded propulsor in various working conditions. The flow-field details at different cross-sections between the propeller and the inclined bracket were compared and analyzed, allowing for more intuitive comparison of the flow-field characteristics of L-type podded propulsors. The interference mechanisms among the propeller, pod, and bracket of the L-type podded propulsors at different advance coefficients, deflection angles, and deflection directions were investigated in depth. The results of this study can serve as reference material and provide technical support for the design and practical shipbuilding application of L-type podded propulsors. Therefore, the results have theoretical significance and practical engineering value.

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“…For bulk carriers, the ballast condition accounts for almost 50% of the total operation time [4]. Our previous paper [2] described in detail the measurement of the wake fields based on the PIV under the design-loading condition, and most of the literature focuses on the flow characteristics around the hulls under the design conditions [5][6][7][8][9][10][11][12][13]. The flow characteristics around the ship under the ballast condition is different from that under the design condition with the change in the draft, inclination angle, and the float status.…”

Section: Introductionmentioning

confidence: 99%

“…The particle image velocimetry (PIV) method has an extensive use on measuring the wake of ships and propellers. Due to the coupled interaction of the turbulent boundary layer, 3D flow separation, and the orbital motion of water particles, the flow characteristics around the ships are very complex [2,3]. In addition, the flow characteristics are affected by the hull form, stern type, and loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

Luo

Jiang

et al. 2020

JMSE

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Particle image velocimetry is applied in this study to measure the wake flow field of a Panamax Bulker ship model under the ballast condition. This investigation revealed that the Froude number is 0.167. The time-averaged velocity, turbulent fluctuations, turbulent kinetic energy (TKE), Reynolds stresses, and vorticity information were measured to perform a comparison with the design condition. The time-averaged velocity contours indicated that the ballast and design conditions have distinct hook-like axial velocity contours; however, they appeared at different positions. The big difference under the ballast condition is that the top of the propeller disk area is near the free surface and a region with strong root mean square velocity fluctuation is formed near the free surface. The TKE, the Reynolds stresses, and the hub cap vortex (Hcv) are all affected by the turbulent velocity fluctuation region under the ballast condition. A strong bilge vortex (Bv) is produced when the water flows through the U-shaped stern for the design and ballast conditions.

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Experimental study on the wake fields of a Panamax Bulker based on stereo particle image velocimetry

Cited by 19 publications

References 22 publications

Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran

Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran

Hydrodynamic Interactions between Bracket and Propeller of Podded Propulsor Based on Particle Image Velocimetry Test

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

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