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軸流泵裝置出水流道內(nèi)流脈動與流動噪聲試驗(yàn)分析
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國家自然科學(xué)基金項(xiàng)目(51609210),、江蘇省自然科學(xué)基金項(xiàng)目(BK20150457),、中國博士后科學(xué)基金項(xiàng)目(2016M591932),、江蘇省博士后科研計(jì)劃項(xiàng)目(1601161B),、流體及動力機(jī)械教育部重點(diǎn)實(shí)驗(yàn)室開放課題項(xiàng)目(szjj2016-078)和江蘇高校優(yōu)勢學(xué)科建設(shè)工程項(xiàng)目(PAPD)


Experiment Analysis on Flow-induced Pulsation and Noise in Outlet Conduit of Vertical Axial-flow Pumping System
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    摘要:

    為了研究立式軸流泵裝置出水流道內(nèi)流脈動及流動噪聲的變化規(guī)律,,采用在出水流道布置壓力傳感器和水聽器的試驗(yàn)方法研究分析了軸流泵裝置不同轉(zhuǎn)速,、不同流量時(shí)出水流道的內(nèi)流脈動及流動噪聲的時(shí)頻特性。結(jié)果表明:相同流量比時(shí),,各監(jiān)測點(diǎn)的脈動幅值均方根均隨轉(zhuǎn)速的增加而增加,。相同轉(zhuǎn)速時(shí),,各監(jiān)測點(diǎn)的脈動幅值均方根均隨流量比的增大而減小,不同流量比時(shí)各監(jiān)測點(diǎn)的脈動主頻存在差異性,;不同轉(zhuǎn)速相同流量比時(shí)同一監(jiān)測點(diǎn)的脈動主頻存在差異性;不同轉(zhuǎn)速不同流量比時(shí)各監(jiān)測點(diǎn)的脈動主頻以51Hz為主,,脈動主頻和脈動次主頻均未與轉(zhuǎn)頻呈整倍數(shù)關(guān)系,,脈動主頻和次主頻均在200Hz范圍內(nèi)。相同流量比時(shí)出水流道內(nèi)部流動噪聲的聲壓級隨轉(zhuǎn)速的增加而增加,,轉(zhuǎn)速對最優(yōu)工況時(shí)出水流道流動噪聲的聲壓級影響較明顯,。相同轉(zhuǎn)速時(shí),出水流道內(nèi)部的流動噪聲隨流量的增加呈先減小后增大的趨勢,。根據(jù)出水流道內(nèi)流脈動幅值分析,,應(yīng)盡量避免低揚(yáng)程泵裝置在小流量工況運(yùn)行。

    Abstract:

    The pressure pulsation and flow-induced noise of outlet conduit have become two of important problems which have negative effect on axial-flow pumping system reliability. In order to investigate the flow-induced noise and pressure fluctuation characteristics of outlet conduit in axial-flow pumping system under different operating conditions, the fluctuating pressure and noised signals were obtained by pressure transduces mounted at different positions and a hydrophone in middle of outlet conduit. The experimental data were further analyzed by using short-time Fourier transform method at speeds of 1450 r/min, 1800 r/min and 2200 r/min. The results showed that with the increase of rotational speed, the root mean square of the pulsating amplitude of each measuring point was increased in the same flow rate ratio. With the increase of flow rate ratio, the root mean square of pulsating amplitude was decreased for each measuring point at the same rotational speed, while there were differences in the dominant frequency of each measuring point in different flow rate ratios. The latter was adjacent to 51Hz for the same measuring point at different flow rate ratios with different rotational speeds. The dominant frequency and subdominant frequency were not multiple relation with rotational frequency. The dominant frequency and subdominant frequency was in the range of 200Hz. With the increase of rotational speed, sound pressure level of flow-induced noise was increased in the same flow rate ratio. With the increase of flow rate, the sound pressure level of flow-induced noise was decreased firstly and then increased at the same rotational speed. The rotational speed had great influence on sound pressure level of flow-induced noise under the optimal condition. The research result had reference value for study on pressure pulsation and flow-induced noise in outlet conduit of pumping system.

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楊帆,高慧,劉超,趙浩儒,湯方平.軸流泵裝置出水流道內(nèi)流脈動與流動噪聲試驗(yàn)分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2018,49(3):144-149,,165. YANG Fan, GAO Hui, LIU Chao, ZHAO Haoru, TANG Fangping. Experiment Analysis on Flow-induced Pulsation and Noise in Outlet Conduit of Vertical Axial-flow Pumping System[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(3):144-149,,165.

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  • 收稿日期:2017-07-21
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  • 在線發(fā)布日期: 2018-03-10
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