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Chamber pressure skewness corrections using a passive relief valve system at the Pico oscillating water column wave energy plant
Renewable Energy ( IF 8.7 ) Pub Date : 2018-04-10
Kieran Monk, Victor Winands, Miguel Lopes

Power production levels at the Pico plant fall significantly short of pre-project estimates. Poor turbine performance compared to expectations from scale model testing accounts for much of this shortfall. Unanticipated chamber pressure skewness is also found to contribute to the deficit. This skewness manifests from wave shoaling because of the shallow chamber water depth from boulder collection and is worsened by intermittent chamber pressure losses caused by chamber wall defects. A passive non-return by-pass relief valve system for partially counteracting chamber pressure skewness is investigated. This functions by venting more of the unconvertible pneumatic over-power during the more intense but shorter duration exhalation half-wave cycles. At the same time, it retains more of the convertible pneumatic under-power in the weaker but longer duration inhalation half-wave cycles. This method reduces the degree of pressure skewness, which improves the system performance in higher energy excitation conditions. The passive relief valve specifications are optimised with a time-domain wave to wire model which is also used to project the expected plant performance enhancement in a range of wave conditions. Simulation results are compared to limited field tests results using a simple prototype passive valve system and good agreement is found.



中文翻译:

在Pico振荡水柱波能发电厂使用被动泄压阀系统对腔室压力偏斜进行校正

Pico工厂的电力生产水平大大低于项目前的估计。与比例模型测试的预期相比,涡轮机性能较差是造成此不足的主要原因。还发现了意料之外的腔压力偏斜导致了这种不足。这种偏斜现象是由于巨石收集产生的浅室水深而在波浪浅滩引起的,并且由于室壁缺陷造成的间歇性室压损失而加剧了这种偏斜。研究了用于部分抵消腔室压力偏斜的被动止回旁通溢流阀系统。通过在更剧烈但持续时间更短的呼气半波周期中释放更多不可转换的气动过功率来发挥作用。同时,在较弱但持续时间更长的吸入半波循环中,它保留了更多的可转换气动动力不足。这种方法降低了压力偏斜的程度,从而改善了在较高能量激发条件下的系统性能。被动泄压阀的规格通过时域波到线模型进行了优化,该模型还用于预测一系列波况下预期的工厂性能提升。使用简单的原型被动阀系统将模拟结果与有限的现场测试结果进行比较,并找到了很好的一致性。被动泄压阀的规格通过时域波到线模型进行了优化,该模型还用于预测一系列波况下预期的工厂性能提升。使用简单的原型被动阀系统将模拟结果与有限的现场测试结果进行比较,并找到了很好的一致性。被动泄压阀的规格通过时域波到线模型进行了优化,该模型还用于预测一系列波况下预期的工厂性能提升。使用简单的原型被动阀系统将模拟结果与有限的现场测试结果进行比较,并找到了很好的一致性。

更新日期:2018-04-11
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