三河口水利枢纽泄洪放空底孔事故闸门水力学及流激振动试验研究
|
摘要
本文针对三河口水利枢纽泄洪放空底孔事故闸门动水关闭过程门体的水力学及流激振动问题,按重力相似准则和水弹性相似准则研制了比尺为1∶20事故闸门的水力相似模型和完全水弹性相似模型。通过模型试验,研究了事故闸门动水闭门过程中门体水力荷载和流激振动响应特性。研究结果表明:闸门上游底缘倾角由47°增大为57°时,上游底缘的最小压强由-98. 0 kPa增大为271. 8kPa,有利于防止闸门底缘附近发生水流空化及减小闸门闭门力。研制的事故闸门水弹性模型试验模态结果与数值计算结果吻合较好。该事故闸门水弹性相似模型能够更直接的测量分析闸门的流激振动响应特性,为闸门的设计和运行提供技术支持,并可为类似工程事故闸门的结构优化设计及运行提供参考。
Aiming at the problems from the hydraulics and flow-induced vibration of the gate body during the dynamic water closing process of the emergency gate for the bottom discharge outlet of Sanhekou Water Control Project,a hydraulic similarity model and a complete hydro-elastic similarity model with the scale of 1 ∶ 20 are developed in accordance with gravity similarity criterion and hydro-elastic similarity criterion. Through the model experiments the hydraulic load and flow-induced response characteristics of the gate body during the dynamic water closing process of the emergency gate are studied. The study result shows that when the inclined angle of upstream bottom edge is increased from 47° to 57°,the minimum intensity of pressure at the upstream bottomedge is increased from-98. 0 kP a to 271. 8 kP a,and then is favorable to prevent flow cavitation to occur near the bottom edge of the gate and reduce the closing force of the gate. The modeling result of the developed hydro-elastic model of the emergency gate is better coincided with that of the numerical calculation concerned. The hydro-elastic similarity model of the emergency gate can directly measure and analyze the flow-induced vibration response characteristics,and then provide the relevant technical support for both the design and operation of the gate as well as a certain reference for the optimal structure design and operation of the emergency gate for the similar project.
Aiming at the problems from the hydraulics and flow-induced vibration of the gate body during the dynamic water closing process of the emergency gate for the bottom discharge outlet of Sanhekou Water Control Project,a hydraulic similarity model and a complete hydro-elastic similarity model with the scale of 1 ∶ 20 are developed in accordance with gravity similarity criterion and hydro-elastic similarity criterion. Through the model experiments the hydraulic load and flow-induced response characteristics of the gate body during the dynamic water closing process of the emergency gate are studied. The study result shows that when the inclined angle of upstream bottom edge is increased from 47° to 57°,the minimum intensity of pressure at the upstream bottomedge is increased from-98. 0 kP a to 271. 8 kP a,and then is favorable to prevent flow cavitation to occur near the bottom edge of the gate and reduce the closing force of the gate. The modeling result of the developed hydro-elastic model of the emergency gate is better coincided with that of the numerical calculation concerned. The hydro-elastic similarity model of the emergency gate can directly measure and analyze the flow-induced vibration response characteristics,and then provide the relevant technical support for both the design and operation of the gate as well as a certain reference for the optimal structure design and operation of the emergency gate for the similar project.
引文
[1] NAUDASCHER E,KOBUS H E,RAO R P R. Hydrodynamicanalysis for high-head leaf gates[J]. Journal of the Hydraulics Divi-sion,1964,90(3):155-192.
[2] AHMED T M. Effect of gate lip shapes on the down pull force in tun-nel gates[D]. Baghdad:University of Baghdad,1999.
[3]章晋雄,王磊,强杰,等.流量对事故闸门门体水力荷载影响数值模拟研究[J].水利水电技术,2017,48(11):107-112.
[4]中华人民共和国水利部.水利水电工程钢闸门设计规范:SL74—2013[S].北京:中国水利水电出版社,2013.
[5]章晋雄,吴一红,张东,等.高水头平面闸门动水关闭的水动力特性数值模拟研究[J].水力发电学报,2013,32(5):184-190.
[6]文森林,王才欢,杨伟,等.水工附环闸门闭门过程水力特性数值模拟研究[J].长江科学院院报,2017,34(10):68-73.
[7]张文远,杨帆,章晋雄,等.白鹤滩水电站泄洪洞工作弧门流激振动模型试验研究[J].噪声与振动控制,2018,38(S2):422-426.
[8]张文远,张东.金沙江溪洛渡水电站泄洪放空洞事故闸门模态分析及流激振动试验研究[C]//第三届全国水力学与水利信息学大会. 2017:243-248.
[9]刘鹏,高振海,严根华,等.大跨度上翻式拱形钢闸门振动特性及抗振优化[J].水利水电科技进展,2011,31(3):74-79.
[10]朱泽峰,朱召泉,方帅.基于ADINA的人字闸门流激振动分析[J].水运工程,2017(12):174-178.
[11]严根华.水工闸门流激振动研究进展[J].水利水运工程学报,2006(1):66-73.
[2] AHMED T M. Effect of gate lip shapes on the down pull force in tun-nel gates[D]. Baghdad:University of Baghdad,1999.
[3]章晋雄,王磊,强杰,等.流量对事故闸门门体水力荷载影响数值模拟研究[J].水利水电技术,2017,48(11):107-112.
[4]中华人民共和国水利部.水利水电工程钢闸门设计规范:SL74—2013[S].北京:中国水利水电出版社,2013.
[5]章晋雄,吴一红,张东,等.高水头平面闸门动水关闭的水动力特性数值模拟研究[J].水力发电学报,2013,32(5):184-190.
[6]文森林,王才欢,杨伟,等.水工附环闸门闭门过程水力特性数值模拟研究[J].长江科学院院报,2017,34(10):68-73.
[7]张文远,杨帆,章晋雄,等.白鹤滩水电站泄洪洞工作弧门流激振动模型试验研究[J].噪声与振动控制,2018,38(S2):422-426.
[8]张文远,张东.金沙江溪洛渡水电站泄洪放空洞事故闸门模态分析及流激振动试验研究[C]//第三届全国水力学与水利信息学大会. 2017:243-248.
[9]刘鹏,高振海,严根华,等.大跨度上翻式拱形钢闸门振动特性及抗振优化[J].水利水电科技进展,2011,31(3):74-79.
[10]朱泽峰,朱召泉,方帅.基于ADINA的人字闸门流激振动分析[J].水运工程,2017(12):174-178.
[11]严根华.水工闸门流激振动研究进展[J].水利水运工程学报,2006(1):66-73.