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波纹状喷嘴蒸汽引射器性能分析

DOI: 10.13334/j.0258-8013.pcsee.2014.35.001, PP. 6255-6262

Keywords: 引射器,波纹状喷嘴,引射系数,涡量

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Abstract:

建立三维汽汽引射器数值模型,与普通喷嘴实验结果对比验证模型的准确性,对安装波纹状一次流喷嘴的引射器进行了分析。研究波纹的数目(Cn),波幅(h/D),波纹占喷嘴长度比率(l/L)和波纹扭曲角度(θ)对引射器的引射系数(ER)和临界背压(CBP)的影响。对引射器混合室内的涡量(流向和展向)分布进行了分析,发现涡强度越大,持续时间越长则引射系数越高,同时由于二次流流量加大和湍流的增强使机械能损失加大,从而导致临界背压下降;但当产生的展向涡过早与壁面接触时,则会导致接触点以后涡快速衰减,并导致引射系数和临界背压都下降。在所研究的波纹参数范围内,相比无波纹喷嘴,引射系数最大可提高13.9%,临界背压对应下降5.1%。

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