發(fā)布時(shí)間：2018-04-23 10:18

  本文選題：壓氣機(jī) + 葉輪　； 參考：《車用發(fā)動(dòng)機(jī)》2016年01期

【摘要】：采用Numeca數(shù)值分析軟件分析了3種不同出口結(jié)構(gòu)形式的壓氣機(jī)葉輪性能,等出口大徑情況下徑流葉輪壓比最高,斜流葉輪壓比最低,效率方面則是半斜流葉輪最高。通過壓氣機(jī)流場(chǎng)分析發(fā)現(xiàn),各轉(zhuǎn)速小流量下,徑流葉輪在葉輪出口輪緣一側(cè)產(chǎn)生大范圍的回流,斜流葉輪則在輪轂一側(cè)產(chǎn)生較大范圍的回流,而半斜流葉輪兼有徑流葉輪和斜流葉輪設(shè)計(jì)特點(diǎn),輪轂和輪緣兩側(cè)的流場(chǎng)均得到明顯改善。在堵塞流量附近工況點(diǎn),半斜流葉輪和斜流葉輪出口相對(duì)馬赫數(shù)較徑流葉輪略小,利于堵塞流量的增加。通過軸向載荷分析發(fā)現(xiàn),由于斜流葉輪和半斜流葉輪相比等直徑的徑流葉輪壓比較低,導(dǎo)致由壓氣機(jī)輪背指向壓氣機(jī)進(jìn)口的軸向力減小,使得整個(gè)增壓器轉(zhuǎn)軸有向渦端運(yùn)動(dòng)的趨勢(shì),由此容易導(dǎo)致止推軸承壓端磨損嚴(yán)重;與此同時(shí),轉(zhuǎn)軸移動(dòng)也會(huì)使得葉輪與壓氣機(jī)蝸殼的軸向間隙增大,導(dǎo)致半斜流葉輪與斜流葉輪效率降低。
[Abstract]:The performance of three compressor impellers with different outlet structures was analyzed by Numeca software. The flow impeller pressure ratio is the highest, the inclined flow impeller pressure ratio is the lowest, and the efficiency is the highest in the case of equal outlet large diameter. Through the analysis of the compressor flow field, it is found that the flow impeller produces a large range of backflow on the side of the impeller outlet wheel, and a large range of reflux on the hub side of the inclined impeller under each rotating speed and small flow rate. The semi-oblique impeller has the characteristics of both the run-off impeller and the oblique impeller, and the flow field on both sides of the hub and rim is improved obviously. The relative Mach number at the outlet of semi-oblique impeller and oblique flow impeller is slightly smaller than that of runoff impeller at the working point near the clogging flow rate, which is beneficial to increase the clogging flow rate. Through the axial load analysis, it is found that the axial force from the back of the compressor to the inlet of the compressor is reduced because the pressure of the oblique impeller and the semi-oblique impeller is lower than that of the equal diameter flow impeller. The axial clearance between the impeller and the compressor volute will increase because of the tendency of the whole turbocharger shaft moving towards the vortex end, which will easily lead to serious wear on the thrust bearing end, and at the same time, the axial clearance between the impeller and the compressor volute will be enlarged. The efficiency of semi-oblique impeller and inclined impeller is reduced.
【作者單位】： 湖南天雁機(jī)械有限責(zé)任公司;
【基金】：湖南省科技重大專項(xiàng)(2014FJ1013)
【分類號(hào)】：TK403

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1 劉亮;葉輪出口參數(shù)對(duì)離心泵性能的影響[J];長(zhǎng)沙電力學(xué)院學(xué)報(bào)(自然科學(xué)版);1995年04期

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本文編號(hào)：1791534