双浮体波浪能装置的振荡和能量转换特性研究（英文）
|
摘要
In this study, we investigated the hydrodynamic and energy conversion performance of a double-float wave energy converter(WEC) based on the linear theory of water waves. The generator power take-off(PTO) system is modeled as a combination of a linear viscous damping and a linear spring. Using the frequency domain method, the optimal damping coefficient of the generator PTO system is derived to achieve the optimal conversion efficiency(capture width ratio).Based on the potential flow theory and the higher-order boundary element method(HOBEM), we constructed a threedimensional model of double-float WEC to study its hydrodynamic performance and response in the time domain. Only the heave motion of the two-body system is considered and a virtual function is introduced to decouple the motions of the floats. The energy conversion character of the double-float WEC is also evaluated. The investigation is carried out over a wide range of incident wave frequency. By analyzing the effects of the incident wave frequency, we derive the PTO's damping coefficient for the double-float WEC's capture width ratio and the relationships between the capture width ratio and the natural frequencies of the lower and upper floats. In addition, it is capable to modify the natural frequencies of the two floats by changing the stiffness coefficients of the PTO and mooring systems. We found that the natural frequencies of the device can directly influence the peak frequency of the capture width, which may provide an important reference for the design of WECs.
In this study, we investigated the hydrodynamic and energy conversion performance of a double-float wave energy converter(WEC) based on the linear theory of water waves. The generator power take-off(PTO) system is modeled as a combination of a linear viscous damping and a linear spring. Using the frequency domain method, the optimal damping coefficient of the generator PTO system is derived to achieve the optimal conversion efficiency(capture width ratio).Based on the potential flow theory and the higher-order boundary element method(HOBEM), we constructed a threedimensional model of double-float WEC to study its hydrodynamic performance and response in the time domain. Only the heave motion of the two-body system is considered and a virtual function is introduced to decouple the motions of the floats. The energy conversion character of the double-float WEC is also evaluated. The investigation is carried out over a wide range of incident wave frequency. By analyzing the effects of the incident wave frequency, we derive the PTO's damping coefficient for the double-float WEC's capture width ratio and the relationships between the capture width ratio and the natural frequencies of the lower and upper floats. In addition, it is capable to modify the natural frequencies of the two floats by changing the stiffness coefficients of the PTO and mooring systems. We found that the natural frequencies of the device can directly influence the peak frequency of the capture width, which may provide an important reference for the design of WECs.
In this study, we investigated the hydrodynamic and energy conversion performance of a double-float wave energy converter(WEC) based on the linear theory of water waves. The generator power take-off(PTO) system is modeled as a combination of a linear viscous damping and a linear spring. Using the frequency domain method, the optimal damping coefficient of the generator PTO system is derived to achieve the optimal conversion efficiency(capture width ratio).Based on the potential flow theory and the higher-order boundary element method(HOBEM), we constructed a threedimensional model of double-float WEC to study its hydrodynamic performance and response in the time domain. Only the heave motion of the two-body system is considered and a virtual function is introduced to decouple the motions of the floats. The energy conversion character of the double-float WEC is also evaluated. The investigation is carried out over a wide range of incident wave frequency. By analyzing the effects of the incident wave frequency, we derive the PTO's damping coefficient for the double-float WEC's capture width ratio and the relationships between the capture width ratio and the natural frequencies of the lower and upper floats. In addition, it is capable to modify the natural frequencies of the two floats by changing the stiffness coefficients of the PTO and mooring systems. We found that the natural frequencies of the device can directly influence the peak frequency of the capture width, which may provide an important reference for the design of WECs.
引文
Basco RD(1984)Water wave mechanics for engineers and scientists.Prentice-Hall, New Jersey, 245-255. https://doi.org/10.1142/1232
Cho IH, Kim MH(2017)Hydrodynamic performance evaluation of a wave energy converter with two concentric vertical cylinders by analytic solutions and model tests. Ocean Eng 130:498-509.https://doi.org/10.1016/j.oceaneng.2016.11.069
Dai Y, Chen Y, Xie L(2017)A study on a novel two-body floating wave energy converter. Ocean Eng 130:407-416. https://doi.org/10.1016/j.oceaneng.2016.11.049
Eriksson M, Isberg J, Leijon M(2005)Hydrodynamic modelling of a direct drive wave energy converter. Int J Eng Sci 43(17-18):1377-1387.https://doi.org/10.1016/j.ijengsci.2005.05.014
Evans DV(1976)A theory for wave-power absorption by oscillating bodies. J Fluid Mech 77(1):1-25. https://doi.org/10.1017/S0022112076001109
Falcao A(2010)Wave energy utilization:a review of the technologies.Renew Sust Energ Rev 14:899-918, https://doi.org/10.1016/j.rser.2009.11.003
Falnes J(1999)Wave-energy conversion through relative motion between two single-mode oscillating bodies. J Offshore Arct Eng121(1):32-38. https://doi.org/10.1115/1.2829552
Falnes J(2007)A review of wave-energy extraction. Mar Struct 20(4):185-201.https://doi.org/10.1016/j.marstruc.2007.09.001
Isaacs JD, Seymour RJ(1973)The ocean as a power resource. Int J Environ Stud 4(3):201-205. https://doi.org/10.1080/00207237308709563
Kim J, Koh HJ, Cho IH, Kim MH, Kweon HM(2016)Experimental study of wave energy extraction by a dual-buoy heaving system.Int J Naval Archit Ocean Eng 9(1):25-34. https://doi.org/10.1016/j.ijnaoe.2016.07.002
Liang C, Zuo L(2017)On the dynamics and design of a two-body wave energy converter. Renew Energy 101(1):265-274. https://doi.org/10.1016/j.renene.2016.08.059
Son D, Yeung RW(2017)Optimizing Ocean-wave energy extraction of a dual coaxial-cylinder WEC using nonlinear model predictive control. Appl Energy 187:746-757. https://doi.org/10.1016/j.apenergy.2016.11.068
Son D, Belissen V, Yeung RW(2016)Performance validation and optimization of a dual coaxial-cylinder ocean-wave energy extractor. Renew Energy 92:192-201. https://doi.org/10.1016/j.renene,2016.01.032
Tanizawa K(1995)A nonlinear simulation method of 3-D body motions in waves. J Soc Naval Architect 178:179-191. https://doi.org/10.2534/jjasnaoe1968.1995.178_179
Wu BJ, Wang X, Diao XH, Zhang YQ(2013)Response and conversion efficiency of a wave energy device consisting of double cylindrical floats with two degrees of freedom. Science China Physics,Mechanics Astronomy 43(8):978-986. https://doi.org/10.1360/132012-598
Yu YH, Li Y(2013)Reynolds-averaged Navier Stokes simulation of the heave performance of a two-body floating-point absorber wave energy system. Comput Fluids 73(6):104-114. https://doi.org/10.1016/j.compfluid.2012.10.007
Zhang WC, Liu HX, Zhang L, Zhang XW(2016)Hydrodynamic analysis and shape optimization for vertical axisymmetric wave energy converters. China Ocean Eng 30(6):954-966. https://doi.org/10.1007/s13344-016-0062-2
Zhou BZ, Wu GX(2015)Resonance of a tension leg platform exited by third-harmonic force in nonlinear regular waves. Philos Trans R Soc A Math Phys Eng Sci 373(2033):156-164. https://doi.org/10.1098/rsta.2014.0105
Zhou BZ,Wu GX, Teng B(2015)Fully nonlinear wave interaction with freely floating non-wall-sided structures. Eng Anal Bound Elem 50:117-132. https://doi.org/10.1016/j.enganabound.2014.08.003
Zhou BZ, Wu GX, Meng Q(2016)Interactions of fully nonlinear solitary wave with a freely floating vertical cylinder. Eng Anal Bound Elem69:119-131. https://doi.org/10.1016/j.enganabound.2016.05.004
Cho IH, Kim MH(2017)Hydrodynamic performance evaluation of a wave energy converter with two concentric vertical cylinders by analytic solutions and model tests. Ocean Eng 130:498-509.https://doi.org/10.1016/j.oceaneng.2016.11.069
Dai Y, Chen Y, Xie L(2017)A study on a novel two-body floating wave energy converter. Ocean Eng 130:407-416. https://doi.org/10.1016/j.oceaneng.2016.11.049
Eriksson M, Isberg J, Leijon M(2005)Hydrodynamic modelling of a direct drive wave energy converter. Int J Eng Sci 43(17-18):1377-1387.https://doi.org/10.1016/j.ijengsci.2005.05.014
Evans DV(1976)A theory for wave-power absorption by oscillating bodies. J Fluid Mech 77(1):1-25. https://doi.org/10.1017/S0022112076001109
Falcao A(2010)Wave energy utilization:a review of the technologies.Renew Sust Energ Rev 14:899-918, https://doi.org/10.1016/j.rser.2009.11.003
Falnes J(1999)Wave-energy conversion through relative motion between two single-mode oscillating bodies. J Offshore Arct Eng121(1):32-38. https://doi.org/10.1115/1.2829552
Falnes J(2007)A review of wave-energy extraction. Mar Struct 20(4):185-201.https://doi.org/10.1016/j.marstruc.2007.09.001
Isaacs JD, Seymour RJ(1973)The ocean as a power resource. Int J Environ Stud 4(3):201-205. https://doi.org/10.1080/00207237308709563
Kim J, Koh HJ, Cho IH, Kim MH, Kweon HM(2016)Experimental study of wave energy extraction by a dual-buoy heaving system.Int J Naval Archit Ocean Eng 9(1):25-34. https://doi.org/10.1016/j.ijnaoe.2016.07.002
Liang C, Zuo L(2017)On the dynamics and design of a two-body wave energy converter. Renew Energy 101(1):265-274. https://doi.org/10.1016/j.renene.2016.08.059
Son D, Yeung RW(2017)Optimizing Ocean-wave energy extraction of a dual coaxial-cylinder WEC using nonlinear model predictive control. Appl Energy 187:746-757. https://doi.org/10.1016/j.apenergy.2016.11.068
Son D, Belissen V, Yeung RW(2016)Performance validation and optimization of a dual coaxial-cylinder ocean-wave energy extractor. Renew Energy 92:192-201. https://doi.org/10.1016/j.renene,2016.01.032
Tanizawa K(1995)A nonlinear simulation method of 3-D body motions in waves. J Soc Naval Architect 178:179-191. https://doi.org/10.2534/jjasnaoe1968.1995.178_179
Wu BJ, Wang X, Diao XH, Zhang YQ(2013)Response and conversion efficiency of a wave energy device consisting of double cylindrical floats with two degrees of freedom. Science China Physics,Mechanics Astronomy 43(8):978-986. https://doi.org/10.1360/132012-598
Yu YH, Li Y(2013)Reynolds-averaged Navier Stokes simulation of the heave performance of a two-body floating-point absorber wave energy system. Comput Fluids 73(6):104-114. https://doi.org/10.1016/j.compfluid.2012.10.007
Zhang WC, Liu HX, Zhang L, Zhang XW(2016)Hydrodynamic analysis and shape optimization for vertical axisymmetric wave energy converters. China Ocean Eng 30(6):954-966. https://doi.org/10.1007/s13344-016-0062-2
Zhou BZ, Wu GX(2015)Resonance of a tension leg platform exited by third-harmonic force in nonlinear regular waves. Philos Trans R Soc A Math Phys Eng Sci 373(2033):156-164. https://doi.org/10.1098/rsta.2014.0105
Zhou BZ,Wu GX, Teng B(2015)Fully nonlinear wave interaction with freely floating non-wall-sided structures. Eng Anal Bound Elem 50:117-132. https://doi.org/10.1016/j.enganabound.2014.08.003
Zhou BZ, Wu GX, Meng Q(2016)Interactions of fully nonlinear solitary wave with a freely floating vertical cylinder. Eng Anal Bound Elem69:119-131. https://doi.org/10.1016/j.enganabound.2016.05.004