The swirl number of secondary air has a great influence on the combustion. When swirl number is small(S<0.8), the fire is long, and may rush the back wall.

二次风旋流强度的变化对炉内燃烧影响较大，旋流数过小时（S<0.8），火焰将冲刷后墙；

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The influence of HALLO swirl system on the combustion process is studied. The characteristic parameters of TBD620V12 diesel engine′s combustion process are given.

根据分析结果，研究了HALLO进气系统对燃烧过程的影响，确定了TBD620V12柴油机燃烧过程的特征参数。

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Hence, the method of vortex control is available for removing swirl, decreasing total pressure loss, and improving flow field in S-shaped intake.

因此，抽气形式的有源涡控是抑制旋流、减少出口总压平均损失、改善S弯进气道出口流场的有效措施。

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The U.K.-based bank's effort to settle comes amid a swirl of global banking scandals and rising antibank sentiment in election-year Washington.

WSJ: HSBC Nears Accord With U.S. in Laundering Probe

So, despite a swirl of accusations since the killing on February 14th of Lebanon's former long-serving prime minister, Rafik Hariri, an event that sparked popular revolt against decades of domination by Syria, this week's arrest of four top Lebanese security officers (and some lesser fry) was a pleasant surprise.

ECONOMIST: Lebanon