表底孔联合消力池三维流场数值模拟研究
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摘要
基于RNGk-ε紊流模型,针对消力池内纵向隔墩对比研究了常规隔墩式消力池与表底孔联合消力池三维流场的差异.数值模拟计算结果表明:拆除消力池内纵向隔墩有助于表底孔联合消力池利用表孔与底孔入池水流差异,使其在消力池上游区域激起强烈横向扩散和碰撞,形成由底至表不断发展的立轴旋滚,显著增强消力池内相邻水股剪切紊动耗散,尤其当底孔单独运行时消力池内过流宽度突变使入池水流形成显著三维水跃,沿程平均流速下降35%~49%,从而改善消力池内水流流态,取得较好的消能效果.
Based on RNG k-ε turbulent model,aiming at longitudinal pier,the conventional stilling basin and the compound stilling basin was studied to reveal the three dimensional(3 D) flow field difference.Numerical simulation results show that compared to the conventional stilling basin,the compound stilling basin without longitudinal pier can utilize the difference among the running inflow from the bottom and the surface outlet and force each flow to laterally offset or collide in the upstream region of the stilling basin,forming observably vertical vortex and significantly intensifying mutual shear turbulence.Under the condition of bottom outlet running alone,it's more remarkable that the running inflow would swiftly transforms into 3 D hydraulic jump in view of the sudden expansion section,and the flow pattern is observably improved with the velocity decreased by 35%~49%,achieving excellent results.
Based on RNG k-ε turbulent model,aiming at longitudinal pier,the conventional stilling basin and the compound stilling basin was studied to reveal the three dimensional(3 D) flow field difference.Numerical simulation results show that compared to the conventional stilling basin,the compound stilling basin without longitudinal pier can utilize the difference among the running inflow from the bottom and the surface outlet and force each flow to laterally offset or collide in the upstream region of the stilling basin,forming observably vertical vortex and significantly intensifying mutual shear turbulence.Under the condition of bottom outlet running alone,it's more remarkable that the running inflow would swiftly transforms into 3 D hydraulic jump in view of the sudden expansion section,and the flow pattern is observably improved with the velocity decreased by 35%~49%,achieving excellent results.
引文
[1]Habibzadeh A,Loewen M R,Rajaratnam N.Performance of baffle blocks in submerged hydraulic jumps[J].Journal of Hydraulic Engineering 2012,138(10):902-908.
[2]Habibzadeh A,Loewen M R,Rajaratnam N.Mean flow in a submerged hydraulic jump with baffle blocks[J].Journal of Engineering Mechanics,2014,140(5):70-75.
[3]Urban A L,Wilhelms S C,Gulliver J S.Decay of turbulence downstream of a stilling basin[J].Journal of Hydraulic Engineering,2005,131(9):825-829.
[4]Roberta P,Oreste F,Giuseppe D G.Hydraulic design of a USBR type II stilling basin[J].Journal of Irrigation and Drainage Engineering,2017,143(5):1-9.
[5]周招,王均星,赵明登,等.低水头非完全宽尾墩三维流场数值模拟[J].华中科技大学学报:自然科学版,2017,45(5):115-121.
[6]周招,王均星,梁砚,等.深尾水消力池非完全宽尾墩消能试验研究[J].水科学进展,2017,28(5):730-738.
[7]Chen J G,Zhang J M,Xu W L,et al.Numerical simulation of the energy dissipation characteristics in stilling basin of multi-horizontal submerged jets[J].Journal of Hydrodynamics,2010,22(5):732-741.
[8]Chen J G,Zhang J M,Xu W L,et al.Scale effects of air-water flows in stilling basin of multi-horizontal submerged jets[J].Journal of Hydrodynamics,2010,22(6):788-795.
[9]Chen J G,Zhang M,Xu W L,et al.Characteristics of the velocity distribution in a hydraulic jump stilling basin with five parallel offset jets in a twin-layer configu-ration[J].Journal of Hydraulic Engineering,2014,140(2):208-217.
[10]Omid M H,Varaki M E,Narayanan R.Gradually expanding hydraulic jump in a trapezoidal channel[J].Journal of Hydraulic Research,2007,45(4):512-518.
[11]杨敏,李会平,李树宁,等.跌坎消力池临底流速试验研究[J].天津大学学报,2013,46(4):342-346.
[12]Li N W,Liu C,Deng J,et al.Theoretical and experimental studies of the flaring gate pier on the surface spillway in a high-arch dam[J].Journal of Hydrodynamics,2012,24(4):496-505.
[13]Michael C J,Bruce M S.Physical and numerical comparison of flow over ogee spillway in the presence of tailwater[J].Journal of Hydraulic Engineering,2006,132(12):1353-1357.
[14]Sajjad M Z,Hosein F,Ebrahim Z,et al.Investigation of hydraulic parameters and cavitation in Kheir Abad flood release structure[J].Canadian Journal of Civil Engineering,2015,42:213-221.
[2]Habibzadeh A,Loewen M R,Rajaratnam N.Mean flow in a submerged hydraulic jump with baffle blocks[J].Journal of Engineering Mechanics,2014,140(5):70-75.
[3]Urban A L,Wilhelms S C,Gulliver J S.Decay of turbulence downstream of a stilling basin[J].Journal of Hydraulic Engineering,2005,131(9):825-829.
[4]Roberta P,Oreste F,Giuseppe D G.Hydraulic design of a USBR type II stilling basin[J].Journal of Irrigation and Drainage Engineering,2017,143(5):1-9.
[5]周招,王均星,赵明登,等.低水头非完全宽尾墩三维流场数值模拟[J].华中科技大学学报:自然科学版,2017,45(5):115-121.
[6]周招,王均星,梁砚,等.深尾水消力池非完全宽尾墩消能试验研究[J].水科学进展,2017,28(5):730-738.
[7]Chen J G,Zhang J M,Xu W L,et al.Numerical simulation of the energy dissipation characteristics in stilling basin of multi-horizontal submerged jets[J].Journal of Hydrodynamics,2010,22(5):732-741.
[8]Chen J G,Zhang J M,Xu W L,et al.Scale effects of air-water flows in stilling basin of multi-horizontal submerged jets[J].Journal of Hydrodynamics,2010,22(6):788-795.
[9]Chen J G,Zhang M,Xu W L,et al.Characteristics of the velocity distribution in a hydraulic jump stilling basin with five parallel offset jets in a twin-layer configu-ration[J].Journal of Hydraulic Engineering,2014,140(2):208-217.
[10]Omid M H,Varaki M E,Narayanan R.Gradually expanding hydraulic jump in a trapezoidal channel[J].Journal of Hydraulic Research,2007,45(4):512-518.
[11]杨敏,李会平,李树宁,等.跌坎消力池临底流速试验研究[J].天津大学学报,2013,46(4):342-346.
[12]Li N W,Liu C,Deng J,et al.Theoretical and experimental studies of the flaring gate pier on the surface spillway in a high-arch dam[J].Journal of Hydrodynamics,2012,24(4):496-505.
[13]Michael C J,Bruce M S.Physical and numerical comparison of flow over ogee spillway in the presence of tailwater[J].Journal of Hydraulic Engineering,2006,132(12):1353-1357.
[14]Sajjad M Z,Hosein F,Ebrahim Z,et al.Investigation of hydraulic parameters and cavitation in Kheir Abad flood release structure[J].Canadian Journal of Civil Engineering,2015,42:213-221.