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頁籤選單縮合
題 名 | 氣渦輪燃燒室之噴霧燃燒數值模擬=Numerical Simulation of the Spray Combustion in Gas Turbine Combustors |
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作 者 | 李國楨; 江滄柳; | 書刊名 | 台電工程月刊 |
卷 期 | 599 1998.07[民87.07] |
頁 次 | 頁1-31 |
分類號 | 446.4122 |
關鍵詞 | 氣渦輪機; 噴霧燃燒; 數值模擬; 迴流; 渦漩器; Gas turbine; Spray combustion; Numerical simulation; Recirculation; Swirler; |
語 文 | 中文(Chinese) |
中文摘要 | 本文以數值模擬的方式,研究分析氣渦輪燃燒室中具渦漩之噴霧燃燒穩態流場。本 研究採用PSlC之方法,分別求解氣相燃燒紊流流場及噴霧油滴軌跡、油滴速度、油滴大小及 溫度變化。至於燃燒模式包括氣相紊流有限速率燃燒模式及油滴點火判斷燃燒模式。計算模 式乃自行發展之多相流邊界契合(Body-fitted)計算程式,此模式能解複雜邊界之多相紊流渦 漩反應流場。經應用於分析一噴霧渦漩燃燒室之流場獲知,入口渦漩強度(以渦漩數代表)會強 烈地影響噴霧油滴路徑及蒸發速度,因此,不僅影響整個流場結構,更影響其燃燒效率及溫度 分佈。而油滴粒徑大小分佈乃決定油氣產生位置及時機之重要參數,因此與渦漩強度有相同之 重要性。由本研究獲知,若欲避免不正常高溫或高壁溫之產生及維持最佳之燃燒效率,入口渦 漩強度、油滴粒徑大小分佈兩者相互關聯,而存在一最佳之操作狀況。此最佳操作狀況,可經 由詳細之數值模擬獲得,以確保高度的燃燒效率及安全的溫度限制。 |
英文摘要 | This paper presents numerical predictions of the spray-combustioon flow in a gas turbine combustor with a swirler. A computational model for the two-phase flow in an arbitrarily-shaped combustor is developed. PSIC (Particle-Source-in-Cell) is adopted in solving the spray-combustion flow with spray droplet trajectory, velocity, size and temperature in a turbulent combustion flow being predicted. Gas-phase combustion is modeled by a finite-rate chemical reaction with the consideration of turbulence-mixing effects, while a realistic droplet combustion model which includes a droplet ignition criterion is employed to determine the droplet burning status. The numerical results obtained from the present study reveal that the flame structure as well as the combustion efficiency of the combustor are strongly dominated by the inlet swirling strength, represented by the swirl number. The inlet droplet-size distribution which determines the position and timing of fuel-vapor generation is equivalently important. An optimal combination of inlet swirling strength and droplet-size distribution can thus be determined numerically based upon a high achieved combustion efficiency and a sufficiently cool chamber wall, where the maximum temperature is safely below the chamber wall's upper temperature limit. |
本系統中英文摘要資訊取自各篇刊載內容。