基于二維叉排管束模型的刷式密封旋渦分離點分析
發(fā)布時間：2019-04-19 23:45
【摘要】：為了進一步研究刷絲束內(nèi)部氣體流動,建立了刷絲束截面的二維緊湊叉排管束模型,運用Fluent軟件對其進行氣體流動數(shù)值模擬.首先根據(jù)網(wǎng)格獨立性的判別標(biāo)準(zhǔn),分析了網(wǎng)格加密程度對刷式密封數(shù)值模擬結(jié)果的影響,并以氣流速度、壓降和氣體質(zhì)量泄漏率的相對變化率作為網(wǎng)格獨立性檢驗的參考量,得到獨立于計算精度的大致網(wǎng)格數(shù).其次,模擬分析了不同排距管束模型在各壓差下的氣體流動,得到分離點S與刷絲間距和上下游壓差之間的關(guān)系.計算結(jié)果表明:網(wǎng)格數(shù)在400 000左右時對數(shù)值模擬結(jié)果誤差在2%以下,網(wǎng)格獨立.分離點S位置在經(jīng)歷前1~2排刷絲束時逐漸向下游移動,最后趨于穩(wěn)定.隨著刷絲間距和上下游壓差的增大,分離點S均會沿著刷絲表面發(fā)生后移,且位置在高壓差條件下相對變化不大.
[Abstract]:In order to further study the gas flow inside the brush bundle, a two-dimensional compact cross-section model of the cross-section of the brush bundle is established, and the gas flow is numerically simulated by using Fluent software. Firstly, according to the criterion of grid independence, the influence of mesh density on the numerical simulation results of brush seal is analyzed, and the relative change rate of gas flow velocity, pressure drop and gas mass leakage rate is taken as the reference of grid independence test. The approximate mesh number independent of the computational accuracy is obtained. Secondly, the gas flow under different pressure difference is simulated and analyzed, and the relationship between the separation point S and the distance between brush and wire and the pressure difference between upstream and downstream is obtained. The results show that the error of the numerical simulation is less than 2% when the grid number is about 400,000, and the grid is independent. The S position of the separation point moves downstream gradually and tends to be stable at the end of the first 1 ~ (2) row of brush filaments. With the increase of brush-wire spacing and the pressure difference between upstream and downstream, the separation point S will move backward along the brush surface, and the position of the separation point will change little under the condition of high pressure difference.
【作者單位】： 昆明理工大學(xué)機電工程學(xué)院;
【基金】：云南省科技計劃項目(2012FB130) 昆明理工大學(xué)分析測試基金資助項目(2016M20152203034)
【分類號】：TB42
本文編號：2461402
[Abstract]:In order to further study the gas flow inside the brush bundle, a two-dimensional compact cross-section model of the cross-section of the brush bundle is established, and the gas flow is numerically simulated by using Fluent software. Firstly, according to the criterion of grid independence, the influence of mesh density on the numerical simulation results of brush seal is analyzed, and the relative change rate of gas flow velocity, pressure drop and gas mass leakage rate is taken as the reference of grid independence test. The approximate mesh number independent of the computational accuracy is obtained. Secondly, the gas flow under different pressure difference is simulated and analyzed, and the relationship between the separation point S and the distance between brush and wire and the pressure difference between upstream and downstream is obtained. The results show that the error of the numerical simulation is less than 2% when the grid number is about 400,000, and the grid is independent. The S position of the separation point moves downstream gradually and tends to be stable at the end of the first 1 ~ (2) row of brush filaments. With the increase of brush-wire spacing and the pressure difference between upstream and downstream, the separation point S will move backward along the brush surface, and the position of the separation point will change little under the condition of high pressure difference.
【作者單位】： 昆明理工大學(xué)機電工程學(xué)院;
【基金】：云南省科技計劃項目(2012FB130) 昆明理工大學(xué)分析測試基金資助項目(2016M20152203034)
【分類號】：TB42
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