軸流泵空化狀態(tài)下軸向推力下降研究
發(fā)布時(shí)間:2018-10-18 10:49
【摘要】:基于RANS方程,結(jié)合切應(yīng)力輸運(yùn)湍流模型計(jì)算某對(duì)旋軸流式噴水推進(jìn)泵無(wú)空化狀態(tài)時(shí)的流體動(dòng)力性能。在此基礎(chǔ)上,嵌入基于Rayleigh-Plesset方程的混合物均相流空化模型,對(duì)空化條件時(shí)該對(duì)旋軸流泵流體動(dòng)力性能進(jìn)行數(shù)值計(jì)算。結(jié)果發(fā)現(xiàn),空化引起對(duì)旋軸流泵軸向推力下降,泵的軸向推力空化特性曲線與揚(yáng)程空化特性曲線相似,但是軸向推力的下降點(diǎn)比揚(yáng)程的下降點(diǎn)推遲5.1%,而臨界點(diǎn)則推遲了2.6%;首級(jí)葉輪和次級(jí)葉輪的軸向推力均存在空化臨界點(diǎn);在臨界點(diǎn)之前,首級(jí)葉輪的軸向推力逐漸上升,而次級(jí)葉輪的軸向推力逐漸下降。
[Abstract]:Based on RANS equation and shear stress transport turbulence model, the hydrodynamic performance of a counter-rotating axial flow water jet propulsion pump without cavitation is calculated. On this basis, a mixture homogeneous flow cavitation model based on Rayleigh-Plesset equation is embedded to numerically calculate the hydrodynamic performance of the counter-rotating axial flow pump under cavitation conditions. The results show that the axial thrust decreases due to cavitation, and the cavitation characteristic curve of axial thrust is similar to that of head. However, the descending point of axial thrust is 5.1 delayed than that of head, and the critical point is 2.6. The axial thrust of first stage impeller and secondary impeller has cavitation critical point; before the critical point, the axial thrust of first stage impeller increases gradually. The axial thrust of secondary impeller decreases gradually.
【作者單位】: 江蘇大學(xué)京江學(xué)院;江蘇大學(xué)流體機(jī)械工程技術(shù)研究中心;
【基金】:江蘇省自然科學(xué)基金面上研究項(xiàng)目(BK20151342)
【分類號(hào)】:U664.34
本文編號(hào):2278892
[Abstract]:Based on RANS equation and shear stress transport turbulence model, the hydrodynamic performance of a counter-rotating axial flow water jet propulsion pump without cavitation is calculated. On this basis, a mixture homogeneous flow cavitation model based on Rayleigh-Plesset equation is embedded to numerically calculate the hydrodynamic performance of the counter-rotating axial flow pump under cavitation conditions. The results show that the axial thrust decreases due to cavitation, and the cavitation characteristic curve of axial thrust is similar to that of head. However, the descending point of axial thrust is 5.1 delayed than that of head, and the critical point is 2.6. The axial thrust of first stage impeller and secondary impeller has cavitation critical point; before the critical point, the axial thrust of first stage impeller increases gradually. The axial thrust of secondary impeller decreases gradually.
【作者單位】: 江蘇大學(xué)京江學(xué)院;江蘇大學(xué)流體機(jī)械工程技術(shù)研究中心;
【基金】:江蘇省自然科學(xué)基金面上研究項(xiàng)目(BK20151342)
【分類號(hào)】:U664.34
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