CAJ | 학술논문

本文提出一个利用分流技术强化超声速横侧射流混合及燃烧的新方法,即通过一个细小通道连通燃料喷口上下游,上游高压流体部分分流到下游,从底部抬高燃料穿透深度.应用修正可压缩性的 k-ε湍流模型,对不同喷射压力下冷态及燃烧流场进行数值模拟.有无采用分流技术的结果对比表明,分流技术能有效增大混合效率和燃烧效率,分流孔位置是一重要影响因素.观察到两类强化混合及燃烧的机制,合理布置分流孔位置可使燃烧效率相对提高 25% 以上.
본문제출일개이용분류기술강화초성속횡측사류혼합급연소적신방법,즉통과일개세소통도련통연료분구상하유,상유고압류체부분분류도하유,종저부태고연료천투심도.응용수정가압축성적 k-ε단류모형,대불동분사압력하랭태급연소류장진행수치모의.유무채용분류기술적결과대비표명,분류기술능유효증대혼합효솔화연소효솔,분류공위치시일중요영향인소.관찰도량류강화혼합급연소적궤제,합리포치분류공위치가사연소효솔상대제고 25% 이상.
This paper proposes a new method of mixing and combustion enhancement utilizing shunting technology in supersonic flow with transverse injection, viz. to connect the upstream and downstream areas of the fuel inlet through a small channel vent. Part of higher-pressure fluid upstream shunts into downstream area and elevates fuel penetration depth from the bottom. Numerical simulations of cold and combustion flow field under different injection pressures are performed applying the k - ε turbulence model with compressibility modification. The results of comparisons with and without shunting show that shunting technology can effectively increase the mixing and combustion efficiency and the locations of shunting holes is an important factor. Two types of mixing and combustion enhancement mechanism are observed. The combustion efficiency can be increased by 25% above relatively when the shunting holes are arranged reasonably.