本文關鍵詞：基于Hartmann諧振腔的霧化噴嘴聲場流場特性　出處：《航空動力學報》2016年09期 　論文類型：期刊論文

  更多相關文章： Hartmann諧振腔 超聲波霧化 氣動聲場 S-A湍流模型 氣動噴嘴

【摘要】：采用試驗與數(shù)值模擬相結合的方法研究了諧振腔孔徑、諧振腔深度、諧振腔與射流噴孔距離以及噴嘴壓比(NPR)對基于Hartmann諧振腔(HRT)的氣動式超聲波霧化噴嘴外部流場及聲場的影響.結果表明:當噴嘴壓比大于2時,噴嘴壓比增大對聲場頻率影響較小;當噴嘴壓比小于2時,諧振腔依然能夠產(chǎn)生高頻聲場,但其頻率較高噴嘴壓比時產(chǎn)生的小.當諧振腔深度小于1倍射流噴孔孔徑時,此時高頻聲場主要由射流的不穩(wěn)定性引發(fā),聲場頻率與諧振腔深度經(jīng)驗關系式此時并不適用;當諧振腔孔徑大于1.75倍射流噴孔孔徑時,聲場頻率大小有降低趨勢.諧振腔與射流噴孔距離與聲場頻率關系緊密,當諧振腔放置在自由射流壓力增大區(qū)域時,才可獲得理想高頻聲場.
[Abstract]:The aperture and depth of the resonator are studied by the combination of experiment and numerical simulation. The distance between the cavity and the Jet Jet and the nozzle pressure ratio (Hartmann) based on the Hartmann Resonator. The effect of flow field and sound field on the external flow field and sound field of the pneumatic ultrasonic atomizing nozzle is obtained. The results show that when the pressure ratio of the nozzle is greater than 2:00. The increase of nozzle pressure ratio has little effect on the frequency of sound field. When the nozzle pressure ratio is less than 2:00, the cavity can still produce high frequency sound field, but its frequency is smaller than that when the nozzle pressure ratio is higher. At this time, the high frequency acoustic field is mainly caused by the instability of the jet, and the empirical relationship between the frequency of the sound field and the depth of the resonator is not applicable at this time. When the aperture of the cavity is larger than 1.75 times of the diameter of the jet hole, the frequency of the acoustic field will decrease, and the distance between the cavity and the jet nozzle is closely related to the frequency of the acoustic field. The ideal high frequency sound field can be obtained only when the cavity is placed in the region where the free jet pressure increases.
【作者單位】： 廈門大學航空航天學院;
【基金】：國家自然科學基金(51406171) 中央高校基本科研業(yè)務費(20720150180) 福建省自然科學基金(2015J05111)
【分類號】：V233.2
【正文快照】： 對燃油噴嘴來說,在要求的工作范圍內(nèi),需要獲得盡可能細的油霧.當液體流量太大時(或液體黏性過大時),由于離心噴嘴噴口尺寸增加,噴嘴出口液膜增加,造成液體霧化質(zhì)量惡化,液滴的索太爾平均直徑(Sauter mean diameter,SMD)急劇增加.已有的研究表明:超聲波霧化噴嘴的霧化性能一般

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