本文選題：自激脈沖射流 + 流場(chǎng)　； 參考：《排灌機(jī)械工程學(xué)報(bào)》2016年03期

【摘要】：利用自行研制的淹沒(méi)射流試驗(yàn)平臺(tái)進(jìn)行水下自激脈沖射流試驗(yàn),得到水下自激脈沖射流駐點(diǎn)壓力的徑向和軸向分布,通過(guò)建立相應(yīng)的物理模型和數(shù)學(xué)模型,對(duì)水下自激脈沖射流內(nèi)外流場(chǎng)進(jìn)行了數(shù)值模擬,得到裝置內(nèi)、外流場(chǎng)的壓力和速度分布,并對(duì)計(jì)算結(jié)果進(jìn)行試驗(yàn)驗(yàn)證.結(jié)果表明:自激脈沖射流在非淹沒(méi)條件下,有明顯的低頻脈沖發(fā)生,而在淹沒(méi)條件下,部分射流能量消耗在淹沒(méi)水流中,以致在腔室內(nèi)難以形成空化,沒(méi)有產(chǎn)生明顯的脈沖,且駐點(diǎn)壓力大幅度減小;不同水深的徑向壓力分布曲線(xiàn)基本是相同的,近似服從高斯正態(tài)分布;軸向駐點(diǎn)壓力均隨靶距的增大而減小,其衰減特性與連續(xù)射流及非淹沒(méi)情況相似,只是其在有圍壓情況下衰減速度更快;水下自激脈沖射流裝置的內(nèi)部流場(chǎng)存在軸心主射流低壓區(qū)、兩個(gè)對(duì)稱(chēng)的負(fù)壓區(qū)、碰撞高壓區(qū),并在靠近碰撞體的腔體處產(chǎn)生漩渦,其外流場(chǎng)和沖擊射流流場(chǎng)相似,但不存在射流核心區(qū).
[Abstract]:The radial and axial distributions of the static pressure of underwater self-excited pulsed jet are obtained by using the self-excited pulse jet test platform, and the corresponding physical and mathematical models are established. The internal and external flow field of underwater self-excited pulsed jet is numerically simulated, and the pressure and velocity distribution of the external flow field in the device are obtained, and the calculated results are verified by experiments. The results show that there are obvious low-frequency pulses in the self-excited pulse jet under non-submerged conditions, while in the submerged condition, some of the jet energy is consumed in the submerged water flow, so it is difficult to form cavitation in the chamber, and no obvious pulse is produced. The radial pressure distribution curve of different water depth is basically the same, which is similar to the normal distribution of Gao Si, and the axial static point pressure decreases with the increase of target distance. Its attenuation characteristics are similar to those of continuous jet and non-submerged jet, except that the attenuation rate is faster under confining pressure, and the internal flow field of underwater self-excited pulse jet device has low pressure region of axial main jet, two symmetrical negative pressure regions and high pressure zone of collision. The vortex is produced in the cavity near the collision body, and the flow field is similar to the impinging jet flow field, but there is no jet core region.
【作者單位】： 華北水利水電大學(xué)電力學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51309099) 水利部公益性行業(yè)科研專(zhuān)項(xiàng)經(jīng)費(fèi)項(xiàng)目(201201085) 華北水利水電大學(xué)創(chuàng)新計(jì)劃項(xiàng)目(HSCX2014118)
【分類(lèi)號(hào)】：TV131.6

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