頁籤選單縮合
題名 | 興達電廠#1、#2海水循環泵葉輪段之流場分析=The Impeller Flow Field Analysis of Circulation Water Pump at Hsin-Ta Thermal Power Plant |
---|---|
作者 | 陳世雄; 唐文元; Chen, Shih H.; Tang, Wen-yuan; |
期刊 | 台電工程月刊 |
出版日期 | 19960600 |
卷期 | 574 1996.06[民85.06] |
頁次 | 頁106-119 |
分類號 | 448.14 |
語文 | chi |
關鍵詞 | 泵; 流體加學計算; 葉片; 定常分析; Pump; Computational fluid dynamics; Blade Steday state analysis; |
中文摘要 | 台電興達火力發電廠的海水冷卻循環泵產生破壞性葉片裂痕損害已有 一段時日,而且也非偶發單一事件。泵的價值昂貴,而葉片損壞不僅造成泵葉片 本身的損失,也可能造成泵殼體因撞擊而遭致更大的損害,同時因泵的停機也會 影響電廠的正常運轉,整體的經濟損失可能非常的大。 泵葉片的斷裂一般而言是由於葉片所承受的應力超過其最大容許值,而應力的產 生主要是來自旋轉過程中流體加在葉片的負荷以及離心力,離心力一般不難由簡 單的公式計算,而流體加在葉片表面的負荷則很難預估,主要是由於葉片的幾何 形狀較複雜,再加上旋轉運動,使葉片與流體問的相對運動呈極為三度空間的模 式。若再加上非定常(unsteady)的擾動,定常與非定常的交互作用使得估計葉片開 始產生裂縫的時間變得非常困難。 隨著計算機的進步以及數值方法的發展而使得許多葉輪機械的物理問題得以解 決。本研究以流體力學計算方法對興達電廠之實體泵進行三維流場的模擬,提供 葉片在正常的運轉狀況下定常之流體受力分佈,以及對流場的大概了解,以進行 有限單元應力分析,破壞分析及葉片壽命預測等,此項研究亦將為電研所日後分 析流體機械性能與壽命之基礎。 本研究以有限的幾何參數及運轉數據,經過電腦的三維葉輪外型模擬,以先進的 交談式網格建立法建立三維扭曲網格,再以三維有限差分法進行數值的解析。所 得結果顯示流體有傾向葉輪根部前緣流動的趨勢,並可能帶動微小貝殼類沖刷該 處造成局部刮痕,這或許是葉輪產生裂縫,進而發生葉片斷裂的原因之一。 |
英文摘要 | It lias been sometime since the first blade crack on the seawater cooling pump of TPC Hsinda Power station was found.This is not an isolate event. The value of the pump is high. Theblade cracks represent not only the loss of the blade itself, butmay also seriously damage the pump casing and othercomponents due to impact from the cracked blades. The pumpshut down may lead to significant power generation loss. Theoverall economical loss could be enormous. Generally speaking, the blade crack is a consequence ofthe stress on the blade surpass its maximum allowable limit.The stress comes mainly from the hydraulic forces exerted onthe blades and from the structural centrifugal force. It is notdifficult to predict the centrifugal force from simple formula-tions. The prediction of the hydraulic force is relativelydifficults simply because the configuration of the pump blade isthree-dimensional and the relative motion between the pumpand the fluid is quite complex. If the usteady perturbation dueto inlet turning duct or rotor - strut intercation isinvolved, theprediction of the blade fatigue life is much more difficult andrequiers careful study. The advancement of computer and numerical methodsmakes the better understanding of turbomachinery flow physicspossible. In the present study, the computational fluid dynamicmethod is adopted in the simulation of the three - dimensionalflow filed of the water pump. The loadings and flow field ofthe impeller under normal operating comdition is provided.The result will then be used infinite element analysis to predictits fatigue life. Hopefully the present study will be used as a guideline for future fluid, machinery performance and lifepredictions. The physical model of the pump is constructed usingcomputer from limited operation parameters and configurationdata. The mesh is generated using an interactive gridgeneration procedure. The flow solution is obtained by solvingfinite difference Euler equations. The results indicate that theflow has a tendency of moving toward the blade leading edge athub. Scratches could occur if tiny shells were carried into thepump. This may initate impeller cracks. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。