千瓦級浮游式黑潮發電渦輪機參數化設計及水動力性能之分析

Abstract

近年來，台灣面臨了傳統發電方式對環境的污染、核電安全的疑慮，尋求替代性發電方式有迫切需要。台灣四面環海，擁有豐沛的海洋能源資源，黑潮尤具開發優勢。但台灣在海洋能源開發技術未臻成熟，且建設費用龐大，因而，適當的設計與分析工具的建立甚為重要。本研究利用台大邱逢琛老師研究室所開發的浮游式黑潮發電機(FKT)作為設計原型，將其建築在參數化設計的構思上，並利用商用計算流力軟體Star-CCM+及自行開發之浮體靜水性能計算程式進行相關的計算模擬。 為求解浮游式黑潮發電機(FKT)於海水中實際運轉時的位置與姿勢，並依據不同的作業狀況進行模擬，於程式執行上，需確認能滿足重力、浮力、流體動力及繫纜力等作用力達到靜力平衡的條件：三個軸向之合力與合力矩皆等於零 。而為取得流體動力，利用計算流力軟體Star-CCM+計算機組於各角度下的水動力性能。接著，利用已經建立的參數化設計，改變特定參數建立一系列模型進行分析。於本研究中，找出機艙、翼形浮體及翼形浮體隔艙之最佳化設計，分析設計模型並搭配壓載艙配置，建立一套作業程序，使機組能滿足沉浮於水面上進行維修，沉沒於海中躲避長浪等要求。

Taiwan faces the big challenge on the energy problem recently, because traditional methods of electricity generation results in environmental pollution. In particular, nuclear power raises safety issues such as radiation and excess waste. Taiwan is surrounded by the ocean, and possesses abundant resources of ocean energy. Kuroshio is the best one to develop in Taiwan, but the lack of the offshore technology and the enormous cost are the difficulties to build up the technology. Therefore, developing the suitable tool to design and analyze is the important tactics. In this research, we choose the Floating Kuroshio Turbine (FKT) which was designed by Dr. Chiu as the original model. We let the FKT modeled in parametric way and simulated by the buoyancy program. In order to estimate the position and posture of FKT underneath the ocean, we need to simulate FKT under different kind of conditions and make sure the reliability in real working environment. Consider the total force balance and total torque balance of gravity force, buoyancy force, hydrodynamic force and towing force in the program. To build the chart of hydrodynamic, we use CFD software to solve the hydrodynamic performance of FKT under every pitch angels. Then, we use three parameters to analyze the performance and find out the best design of FKT to discuss the relation between parameters and performance. In the process of developing FKT, we can design the suitable model to fulfill all the demands.