Experiment on a rectangular cross section scramjet combustor. Part 2: Effects of fuel injector geometry
| Autor: | Murakami, Atsuo, Komuro, Tomoyuki, Kudo, kenji |
|---|---|
| Jazyk: | japonština |
| Rok vydání: | 1993 |
| Předmět: |
fuel injection apparatus
燃料噴射装置 orifice オリフィス mixing efficiency boundary layer 燃焼試験 境界層 燃焼特性 保炎器 階段形 combution test combustion characteristic stepped shape 燃焼器 壁面 combustor スクラムジェット scramjet 圧力分布 燃焼効率 supersonic combustion pressure distribution 矩形断面 超音速燃焼 flame holder combustion efficienncy wall surface rectangular cross section 混合効率 |
| Zdroj: | 航空宇宙技術研究所報告 = Technical Report of National Aerospace Laboratory. 1220:1-25 |
| ISSN: | 0389-4010 |
| Popis: | 矩形断面スクラムジェット燃焼器において、混合効率と燃焼効率の向上をはかるため、ステップと燃料噴射孔の配置および燃料噴射孔下流の一定断面積部分(噴射器平行部)の長さを変えた実験を行った。最大壁圧すなわちprecombustion shockの強さは、噴射器平行部長さが増すと大きくなり、最大壁圧は噴射器平行部出口までの発熱量で決まる。precombustion shockが強すぎる場合は噴射燃料は合体化し、弱すぎる場合は噴射燃料は成層化して、いずれも混合効率、燃焼効率を低下させる。このため高い混合効率、燃焼効率を生成する最適な噴射器平行部長さが必要とされる。ステップおよび噴射孔配置を主流に対して傾斜させても混合効率、燃焼効率の向上は見られなかった。 An experimental study of a rectangular cross section scramjet combustor was carried out. The effects on mixing and combustion performances of the rearward-facing steps, fuel injection orifice arrangements and the length of the constant height section downstream of the step were examined. The peak wall pressure, namely the strength of the precombustion shock, increased as the length of the constant height section downstream of the injection orifices increased. The injected fuel jets coalesced if the precombustion shock was too strong, while they stratified if it was too week. Hence the mixing and combustion efficiencies of these two cases were low. To achieve better fuel mixing, the length of the constant height section must be selected so that it gives the most suitable strength of the precombustion shock. Sweep of the rearward-facing steps and the orifice arrangements had little effect on the mixing and combustion efficiencies. 資料番号: AA0004235000 レポート番号: NAL TR-1220 |
| Databáze: | OpenAIRE |
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