【摘要】：為了探討在導(dǎo)葉出口剩余環(huán)量影響下軸伸式出水流道的水力性能,對(duì)不同水力模型及不同葉片安放角下的后置軸伸式泵裝置采用全結(jié)構(gòu)化網(wǎng)格進(jìn)行了數(shù)值模擬計(jì)算,并與實(shí)驗(yàn)結(jié)果對(duì)比驗(yàn)證模擬結(jié)果的可信度。對(duì)軸伸式出水流道的水力性能進(jìn)行了分析,發(fā)現(xiàn)軸伸出水流道內(nèi)部流態(tài)受導(dǎo)葉出口剩余環(huán)量的影響較大,尤其是對(duì)小流量工況。水力損失系數(shù)不再是某一常數(shù),而是受流態(tài)分布相關(guān)的一變量。通過(guò)對(duì)比不同葉片安放角及不同比轉(zhuǎn)數(shù)葉輪的出水流道進(jìn)口斷面平均渦角與水力損失系數(shù)關(guān)系發(fā)現(xiàn),軸伸式出水流道的水力損失系數(shù)與進(jìn)口斷面的平均渦角存在一最優(yōu)值,本次模擬計(jì)算下2副葉輪的最優(yōu)平均渦角4°~5.3°下的水力損失系數(shù)為1.62×10~(-4)m·s~2/L~2。通過(guò)分析靜壓與總壓沿流線方向的變化趨勢(shì)明確了小流量工況下環(huán)量是引起水力損失的原因,而在大流量工況下流量是引起水力損失的主要原因。
[Abstract]:In order to investigate the hydraulic performance of the axial outlet flow channel under the influence of the residual ring quantity at the outlet of the guide vane, the full structured grid was used to simulate the hydraulic performance of the rear shaft extension pump device with different hydraulic models and different blade placement angles. The simulation results are compared with the experimental results to verify the reliability of the simulation results. The hydraulic performance of the axial outlet channel is analyzed. It is found that the internal flow pattern of the axial outlet flow channel is greatly affected by the residual ring volume at the outlet of the guide vane, especially for the small flow condition. The hydraulic loss coefficient is no longer a constant, but a variable related to the distribution of the flow state. By comparing the relationship between the average vortex angle of outlet passage inlet section and hydraulic loss coefficient of different blade placement angle and different specific rotation impeller, it is found that there is an optimum value between hydraulic loss coefficient and average vortex angle of inlet section. The hydraulic loss coefficient of the two impellers is 1.62 脳 10 ~ (-4) m ~ (-4) m ~ (-2) L ~ (-1) L ~ (2) L ~ (2) at the mean vortex angle of 4 擄~ (5.3) 擄. By analyzing the variation trend of hydrostatic pressure and total pressure along the streamline direction, it is clear that the ring volume is the cause of hydraulic loss under small flow condition, and the main cause of hydraulic loss under large flow condition.
【作者單位】： 揚(yáng)州大學(xué)水利與能源動(dòng)力工程學(xué)院;揚(yáng)州市勘測(cè)設(shè)計(jì)研究院有限公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51376155) 江蘇省自然科學(xué)基金項(xiàng)目(BK20150457) 揚(yáng)州大學(xué)科技創(chuàng)新培育基金項(xiàng)目(2015CXJ033);揚(yáng)州大學(xué)研究生科研創(chuàng)新項(xiàng)目(KYLX_1346)
【分類號(hào)】：O35
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本文編號(hào)：2215876