查詢結果分析
來源資料
頁籤選單縮合
題名 | Combustion Instability in a Combustion Chamber with a Slit V-Gutter=開口V形駐焰器之燃燒不穩定性研究 |
---|---|
作者姓名(中文) | 湯敬民; 潘國隆; 顏昌武; | 書刊名 | 中國機械工程學刊 |
卷期 | 20:1 1999.02[民88.02] |
頁次 | 頁59-65 |
分類號 | 446.11 |
關鍵詞 | V形駐焰器; 燃燒不穩定性; Combustion instability; Flame holder; |
語文 | 英文(English) |
中文摘要 | 本實驗探討前端開口之 V 形駐焰器在紊流尾焰內之燃燒不穩定現象,同時亦探討 在貧、富油極限因燃燒誘導振盪而造成尾焰熄滅時之控制機構。結果顯示,本實驗操作範圍 內各型 V 形駐焰器之振盪主頻為 43、 140 與 280 Hz 而傳統 V 形駐焰器所產生之振盪主 頻是在 43 Hz。駐焰器前端開口時,43 Hz 之振盪主頻與心形收縮會受開口所導入之偏折火 焰所抑制。因此,駐焰器前端適度的開口可改善火焰吹熄及低頻之燃燒不穩定性,但若過度 開口則將造成高頻振盪加大而使燃燒更不穩定。貧油燃燒時,偏折焰及其所偏向之剪流層火 焰面較另一側穩定,燃燒性能也會因反應物在渦漩中有較長之駐留及加熱時間而得到改善。 但當接近富油吹熄極限時,燃燒機構主要是為混合控制,尾焰之重新引燃產生於另一側之剪 流層;因為該處有較高的溫度及紊流強度。 |
英文摘要 | In this work we experimentally investigated the effect of a slit at the vertex of a V-gutter on combustion instability in the turbulent wake flame. Influences of blow-off mechanisms near both lean and rich limits on the combustion-induced oscillation were also studied. Results showed that a proper slit of the V-gutter could suppress the combustion instability and the flame quenching at low frequency. However, oscillations at higher frequencies might become main sources of combustion instability if the opening was overextended. In the fuel-lean condition, the diverted-jet flame was a stabler heat source and the main instability came from fluctuations of the reacting shear lear. The instability mode was similar to that a regular V-gutter under the same operating conditions. Near the rich limit, however, it was more difficult for the jet flame to exist in the wake, while the flame was always re-ignited from the shear layer opposite to the jet flow due to a stronger mixing mechanism. Thus, strong oscillations were induced by the unstable heat release both in fuel-lean and fuel-rich conditions with distinct mechanisms. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。