共查询到13条相似文献,搜索用时 78 毫秒
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层燃炉中的“微爆燃”现象及其与炉拱的关系:炉拱理论的新进展 总被引:3,自引:1,他引:2
根据层燃炉冒正压的程度与燃煤挥发分含量有很大关系这一点,判定炉膛空间内未燃可燃气的“微爆燃”是一种未被发现的导致冒正压的原因。通过分析和验证“微爆燃”的机理及其与炉拱几何特性的关系,提出了消除微爆的各种方法。 相似文献
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采用气相色谱法研究了某6.5 t/h链条炉在3种不同配风方式(尽早配风、均匀配风和推迟配风)下煤层表面各气体组分沿链条长度的分布规律。结果显示:尽早配风和推迟配风相对均匀,配风整体氧量水平较低,推迟配风在煤燃烧的中后期促进焦碳燃烧,集中释放出大量CO和CO2,而且固体碳转化为气态碳(CH4,CO,CO2)的量最大,这说明其煤层燃尽率最高。对炉膛内气相燃烧的数值模拟进一步表明,推迟配风还有利于新型双人字型炉拱在前拱下部形成火焰漩涡,直接冲刷新煤,保证和加速新煤的引燃。 相似文献
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Spectral analysis of New MEXICO standstill measurements to investigate vortex shedding in deep stall
Spectral analysis was performed on the time series data computed from pressure measurements on the New MEXICO (Model Rotor Experiments under Controlled Conditions) rotor in standstill conditions. As a priori, 3D airfoil polars were recreated from standstill measurements and compared against 2D airfoil polars and flat plate theory results to verify the measurements. The spectral analysis revealed the presence of dominant shedding frequencies for certain ranges of the geometric angle of attack. Two dominant shedding modes were identified: One was associated with bluff body vortex shedding, and the other was associated with low Strouhal number shedding. No dominant shedding frequencies were observed for angles of attack beyond 50°. The research improves on our current understanding of the unsteady nature of the stall regime, along with providing insight into the existence of vortex‐induced vibrations on a wind turbine in standstill conditions. 相似文献
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Influence of the karman vortex street on the broadband noise generated from a multiblade fan 总被引:1,自引:1,他引:0
Introduction Multiblade fans are widelyused in domestic airconditioners, commercial sanitary apparatuses, etc. In the case of these fans, decreasing the fan noise is one of the important technical issues for its comfortable operation. The spectra of the fan noise showed that the noise is composed of a few types of aerodynamic noise. This noise comprises not only a discrete frequency noise due to the interference with the wake and the tongue of the scroll casing but also a broadband noise dist… 相似文献