燃烧科学与技术
燃燒科學與技術
연소과학여기술
JOURNAL OF COMBUSTION SCIENCE AND TECHNOLOGY
2014年
1期
51-57
,共7页
燃烧不稳定性%贫燃预混火焰%旋流%极限环
燃燒不穩定性%貧燃預混火燄%鏇流%極限環
연소불은정성%빈연예혼화염%선류%겁한배
combustion instability%lean premixed flame%swirling flow%limit cycle
在低污染模型燃烧室上，从实验角度研究了常温常压下贫燃预混旋流火焰燃烧不稳定性。主要着眼于当量比、旋流数和掺混段结构对于燃烧不稳定性的影响。结果表明，当量比对燃烧的稳定性具有重要影响，随着当量比的提高，燃烧经历了稳定-不稳定-极限环，振荡的频率变化不大，而脉动压力幅值显著增大，最终达到极限环状态。旋流强度增大会导致压力脉动增大，进入不稳定的最小当量比降低。实验所采用的开孔掺混方式与开放式的自由混合方式相比，对燃烧不稳定压力脉动有减小的效果。
在低汙染模型燃燒室上，從實驗角度研究瞭常溫常壓下貧燃預混鏇流火燄燃燒不穩定性。主要著眼于噹量比、鏇流數和摻混段結構對于燃燒不穩定性的影響。結果錶明，噹量比對燃燒的穩定性具有重要影響，隨著噹量比的提高，燃燒經歷瞭穩定-不穩定-極限環，振盪的頻率變化不大，而脈動壓力幅值顯著增大，最終達到極限環狀態。鏇流彊度增大會導緻壓力脈動增大，進入不穩定的最小噹量比降低。實驗所採用的開孔摻混方式與開放式的自由混閤方式相比，對燃燒不穩定壓力脈動有減小的效果。
재저오염모형연소실상，종실험각도연구료상온상압하빈연예혼선류화염연소불은정성。주요착안우당량비、선류수화참혼단결구대우연소불은정성적영향。결과표명，당량비대연소적은정성구유중요영향，수착당량비적제고，연소경력료은정-불은정-겁한배，진탕적빈솔변화불대，이맥동압력폭치현저증대，최종체도겁한배상태。선류강도증대회도치압력맥동증대，진입불은정적최소당량비강저。실험소채용적개공참혼방식여개방식적자유혼합방식상비，대연소불은정압력맥동유감소적효과。
An experimental study was conducted on combustion instability in a lean-premixed swirl-stabilized com-bustor at atmospheric pressure and temperature. The primary objectives were to study the influence of equivalence ratios,swirl number,geometry of premixed sector on combustion instability. The result also revified the influence of equivalence ratios on combustion instability,demonstrating that the combustion process consisted of stable,pause oscillation,instable steps with little variation of frequency and great expansion of peak value of oscillation pressure, finally achieving limit cycle. With the rise of swirl number,the pulsation of oscillation pressure increased signally while the lowest equivalence ratio of combustion instability decreased gradually. Compared with the open geometry of premixed section,the polyporous structure of premixed section could reduce the oscillation pressure in combustor and premixed section.
