浮游式黑潮渦輪發電機轉子葉片性能及機組運動之模擬研究

Study on the Simulation for the Performance of Rotor Blades and Motions of a Floating Kuroshio Turbine

賴忠緯(Chung-Wei Lai)

指導教授 ： 邱逢琛

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201703301

摘要

本研究主要目的為利用OrcaFlex軟體來建立浮游式黑潮渦輪發電機組(Floating Kuroshio Turbine；FKT)的數值模型，並配合計算流體力學(Computational Fluid Dynamics；CFD)軟體ANSYS-FLUENT及WAMIT來進行FKT機組各零組件之流體動力係數計算，再將計算所得的結果導入OrcaFlex軟體中來完成FKT機組數值模型之建立並進行機組的佈放模擬。其中，並針對OrcaFlex軟體中對於轉子葉片的模擬進行修正，以期能在OrcaFlex 2D葉片元素法的架構下模擬出相近於3D計算流體力學所模擬出的葉片性能，以使OrcaFlex模擬FKT機組的運動有更高的精準度。
本研究依據修正後的2D葉片元素性能所建構的FKT機組數值模型，於流速1.1 m/s至1.5 m/s的條件下，設計機組於錨繫狀態下的動態模擬腳本，利用浮力引擎調整進水量以控制FKT機組的沉降與上浮，進行佈放與回收作業模擬。後續當FKT機組研發工作至一定階段，機組會先進行實海域的船拖試驗，因此本研究亦進行船拖受力與深度估算分析，來探討其受力狀況與沒水深度，並作為纜繩長度設計之依據，再與OrcaFlex船拖試驗模擬的結果比對，確認其有效性。
研究結果顯示修正2D葉片性能後的FKT機組，仍可藉由適當增加機組載重，在原設計的浮力引擎容量下達成FKT於錨繫狀態下的佈放與回收作業目標；而船拖受力與沒水深度估算分析結果與OrcaFlex的模擬的結果亦相當一致，同樣顯示可以藉由適當增加機組載重，在原設計的浮力引擎容量下達成FKT於船拖狀態下 的沒水深度目標。

關鍵字

浮游式黑潮渦輪發電機 ； 海流渦輪機 ； 計算流體力學 ； 流體動力 ； 葉片元素法 ； ANSYS-FLUENT ； WAMIT ； OrcaFlex ； 船拖試驗

並列摘要

The purpose of this study is to investigate the deployment and recovery operations for Floating Kuroshio Turbine (FKT) in moored conditions, and those in ship towing conditions by applying the simulation software OrcaFlex. The hydrodynamic coefficients of each element of FKT were calculated by CFD tools of ANSYS-FLUENT and WAMIT. Then these results were introduced into OrcaFlex to set-up the numerical model of FKT, and the simulations of the deployment and recovery operations for FKT in moored conditions, and those in ship towing conditions were carried out. In order to improve the accuracy of simulations, the setting data for the rotor blades in OrcaFlex, which simulates blades performance basing on 2D element method, were modified to fit the more accurate blades performance obtained by 3D CFD method.
In the present study, based on the FKT numerical model built by the modified 2D blade setting data and under the current speed conditions of 1.1 m/s to 1.5 m/s, we accordingly set up simulation scenarios of employing buoyancy engines to adjust water ballast for controlling the FKT’s ascending and descending for simulating the deployment and recovery operations. As the FKT develops to a certain extent, the towing test by ship in real sea must be first conducted. An analysis method to estimate the FKT’s towing force and submerged depth was proposed in the present study, and considered as the basis for cable length planning. Its validity was confirmed by comparing the estimated results with those obtained by OrcaFlex simulation.
The results of simulation based on FKT numerical model with the modified blade performance show that the FKT can achieve the goal depth of the deployment and recovery operation in moored condition under the original capacity of buoyancy engines by adding proper ballast weight for the FKT. Moreover, the simulation results also show that FKT can submerge to proper depth in ship towing condition under the original capacity of buoyancy engines by adding proper ballast weight for the FKT

並列關鍵字

Floating Kuroshio Turbine ； ocean turbine ； CFD ； Hydrodynamics ； Blade Element Method ； ANSYS-FLUENT ； WAMIT ； OrcaFlex ； ship towing test

參考文獻

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