Installation Depth and Incident Wave Height Effect on Hydrodynamic Performance of a Flap Type Wave Energy Converter: Experimental Analysis

Document Type : Original Article


Sea-Based Energy Research group, Babol Noshirvani University, Babol, Iran


The effect of installation depth and height of the incident wave on the hydrodynamic and economic performance of an oscillating wave surge converter (OWSC) wave energy converter is crucial. In this study, an OWSC by considering 1:8 scale has been studied under Caspian Sea wave conditions for 8 water depths from the semi-submerged to fully submerged. The study has been conducted to achieve the best draft ratio and evaluate the systems performance imposed to Caspian waves condition by experimantal method.The results are presented in three parts. The first part studied the converter's flow, power, and sensitivity to the installation depth on a laboratory scale. In the second part, the system results were converted to the main scale 1:8 by using Froude scaling method, and finally, the performance from an economic view evaluated. Results showed that the draft depth has a non-linear effect on the power. System’s power in the dimensionless draft depth of 0.59 is better, and can produce 61 kW. Also, it can pump up to 50 l/s of water. Likewise, suppose the system is used for electricity generation, In that case, it sells $22500 of electricity to the grid annually, and if it is used as a pump, it can supply water to 4710 households on average.


Main Subjects

  1. Alizadeh Kharkeshi, B., Shafaghat, R., Mohebi, M., Talesh Amiri, S. and Mehrabiyan, M., "Numerical simulation of a heavy-duty diesel engine to evaluate the effect of fuel injection duration on engine performance and emission", International Journal of Engineering, Transactions B: Applications, Vol. 34, No. 11, (2021), 2442-2451. doi: 10.5829/ije.2021.34.11b.08
  2. Henry, A.J., "The hydrodynamics of small seabed mounted bottom hinged wave energy conerverters in shallow water", Queen's University Belfast, (2009),
  3. Whittaker, T. and Folley, M., "Nearshore oscillating wave surge converters and the development of oyster", Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 370, No. 1959, (2012), 345-364.
  4. Folley, M., Whittaker, T. and Henry, A., "The effect of water depth on the performance of a small surging wave energy converter", Ocean Engineering, Vol. 34, No. 8-9, (2007), 1265-1274.
  5. Gomes, R., Lopes, M., Henriques, J., Gato, L. and Falcao, A., "The dynamics and power extraction of bottom-hinged plate wave energy converters in regular and irregular waves", Ocean Engineering, Vol. 96, (2015), 86-99.
  6. Xu, C., Wang, X. and Wang, Z., "Experimental study on the dynamics of a bottom-hinged oscillating wave surge converter", In 2016 5th International Conference on Sustainable Energy and Environment Engineering (ICSEEE 2016), 210-214. Atlantis Press.
  7. Ning, D., Liu, C., Zhang, C., Göteman, M., Zhao, H. and Teng, B., "Hydrodynamic performance of an oscillating wave surge converter in regular and irregular waves: An experimental study", Journal of Marine Science and Technology, Vol. 25, No. 5, (2017), 4. doi: 10.6119/JMST-017-0504-1
  8. Chow, Y.-C., Chang, Y.-C., Lin, C.-C., Chen, J.-H. and Tzang, S.-Y., "Experimental investigations on wave energy capture of two bottom-hinged-flap wecs operating in tandem", Ocean Engineering, Vol. 164, (2018), 322-331.
  9. Brito, M., Ferreira, R.M., Teixeira, L., Neves, M.G. and Canelas, R.B., "Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves", Renewable Energy, Vol. 151, (2020), 975-992.
  10. Alizadeh Kharkeshi, B., Shafaghat, R., Alamian, R. and Aghajani Afghan, A.H., "Experimental & analytical hydrodynamic behavior investigation of an onshore owc-wec imposed to caspian sea wave conditions", International Journal of Maritime Technology, Vol. 14, (2020), 1-12.
  11. Shafaghat, R., Fallahi, M., Alizadeh Kharkeshi, B. and Yousefifard, M., "Experimental evaluation of the effect of incident wave frequency on the performance of a dual-chamber oscillating water columns considering resonance phenomenon occurrence", Iranian (Iranica) Journal of Energy & Environment, Vol. 13, No. 2, (2022), 98-110. doi: 10.5829/IJEE.2022.13.02.01
  12. Alizadeh Kharkeshi, B., Shafaghat, R., Jahanian, O., Rezanejad, k. and Alamian, R., "Experimental evaluation of the effect of dimensionless hydrodynamic coefficients on the performance of a multi-chamber oscillating water column converter in laboratory scale", Modares Mechanical Engineering, Vol. 21, No. 12, (2021), 823-834.
  13. Yazdi, H., Shafaghat, R. and Alamian, R., "Experimental assessment of a fixed on-shore oscillating water column device: Case study on oman sea", International Journal of Engineering, Transactions C: Aspects, Vol. 33, No. 3, (2020), 494-504. doi: 10.5829/IJE.2020.33.03C.14
  14. Alizadeh Kharkeshi, B., Shafaghat, R., Jahanian, O., Alamian, R. and Rezanejad, K., "Experimental study on the performance of an oscillating water column by considering the interaction effects of optimal installation depth and dimensionless hydrodynamic coefficients for the caspian sea waves characteristics", Ocean Engineering, Vol. 256, (2022), 111513.