頁籤選單縮合
題 名 | 次音速流進氣道數值模擬分析=Numerical Analysis of Subsonic Intake FlowField |
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作 者 | 劉彥宏; 吳開宏; 鄭敦仁; | 書刊名 | 新新科技年刊 |
卷 期 | 3 2007.01[民96.01] |
頁 次 | 頁14-20 |
分類號 | 447.55 |
關鍵詞 | 進氣道; 總壓恢復係數; Intake; Total pressure recovery coefficient; |
語 文 | 中文(Chinese) |
中文摘要 | 本文針對次音速進氣道在不同管徑下,以計算流體力學方式對進氣道執行數值模擬,以研究進氣道在不同管徑下之流場特性。本文研究物理模型包含為原構型進氣道,再將管壁內縮1.5mm、2.0mm以及2.5mm四種構型下的流場數值分析。從數值結果可得知,當進氣道管壁內縮1.5mm、2.0mm與2.5mm時,其總壓恢復係數(Total Pressure Coefficient)分別為97.2%、96.1%與95.38%。由於總壓恢復係數直接影響渦輪引擎產生推力的多寡,所以總壓恢復係數為本文探討不同管徑對進氣道性能影響之重點。從本文數值結果可得知當管壁內縮2.0mm以後,總壓係數下降幅度變得更快,也就是發動機所能產生的推力變得更少;另外從進氣道出口速度分佈圖,可得知當管壁內縮速2.0mm以後,進氣道出口速度分佈不平均,使引擎發生湧振(Surge)的機會提高。本文依此結果得知,在考慮引擎性能與不發生湧振的前提下,建議進氣道管壁內縮最大極限值為2.0mm。 |
英文摘要 | The investigation on the flow characteristics of the subsonic intake is studied on the numerical simulation. This flow field study is concentrated on the effect of different diameter. The physical models in the research include four types: the proto-type and 3 types whose inner diameter shrinks 1.5mm、2.0mm and 2.5mm compared to the proto-type. The results show that total pressure recovery coefficient of the 3 above smaller intakes is 97.2%、96.1% and 95.38% individually. Since the amount of the total pressure recovery coefficient will affect the turbine engine thrust, so the performance index for the different size intake will be assessed by the total pressure recovery coefficient. Moreover, the result of the intake inner diameter shrinking 2.0mm shows that the decrease rate of the total pressure recovery coefficient will intensify, that is, the engine thrust will decrease more. The outlet velocity distribution of it also shows badly. That will increase the opportunity of surge. Therefore, from the consideration on the engine performance and surge, the max shrink amount of the intake amount of the intake inner diameter won't excess 2.0mm. |
本系統中英文摘要資訊取自各篇刊載內容。