聂孟喜
水工水力学,近海工程,港口工程,航运工程,水工结构工程
个性化签名
- 姓名:聂孟喜
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
水力学
- 研究兴趣:水工水力学,近海工程,港口工程,航运工程,水工结构工程
男,生于1945年,河南人,河川枢纽研究所。1964年9月至1970年9月,清华大学水利系水工结构专业本科;1980年9月至1982年12月,清华大学水利系水工水力学专业硕士研究生;1982年12月至1986年4月,清华大学水利系教师;1986年4月至1987年9月,CSCEC(伊拉克)技术专家;1992年12月至1993年12月,日本九州大学访问学者;1998年10月至1998年12月,澳门大学教授硕士课程;现任清华大学教授、博士生导师。研究方向:水工水力学,近海工程,港口工程,航运工程,水工结构工程。主要成果:先后完成黄河小浪底工程、三峡工程、山西省万家寨引黄工程、安徽响水涧工程,长庆油田以及海军和交通部委托的科研任务。获北京市优秀教学成果一等奖一项,中国水利协会优秀论文奖五项,清华大学科研成果推广应用经济效益显著奖一项,合作出版专著两部。在国内外核心期刊上,如:《中国科学》,ASCE,EI,《水利学报》,《清华大学学报》等发表论文四十余篇。
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主页访问
3505
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成果阅读
555
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成果数
10
聂孟喜, 王旭升, 张琳
海洋工程,2004,22(2):58~61,-0001,():
-1年11月30日
在时域内建立了单锚腿系泊系统在风、浪、流联合作用下动力响应的计算方法。在分析波浪荷载时,使用了设计波法和非线性Stokes五阶波,并由经验公式求出了船舶的风、流荷载作用力。系统的动力初始条件由准静态方法求得。由静态方法得到系泊力后,使用了四阶Runge-Kutta方法求解船舶的运动时历,并作为立管和浮筒动力计算的边界条件。由二维梁柱单元和集中质量法构建了立管和浮筒的数学模型,立管的运动方程用Wilson-θ法求解。模拟计算结果和试验结果进行了比较,吻合得较好,表明本方法能够用于计算单锚腿系泊系统的动力响应。
时域, 单锚腿系泊系统, 准静态方法, 集中质量法
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81浏览
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引用
聂孟喜
清华大学学报,1998,38(8):79~82,-0001,():
-1年11月30日
当一个孤立突体的上游泄流面被加糙后,其顶部的绕流流速由于受上游加糙体的影响和遮掩作用而变小,孤立突体引起的压力降落值也减小,受上游糙体的影响程度不仅取决于其与糙体的间距而且与糙体的高度有关。这表明粗糙壁面确有减蚀作用。在明流反弧段均匀加糙后,可增大反弧末端不平整突体的临界限制高度(例如在100m工作水头条件下,突体临界限制高度从3mm可增大到20mm),可降低施工的控制标准。
空蚀, 粗糙壁面, 压降, 遮掩, 不平整突体
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58浏览
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128下载
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聂孟喜, 吴广镐, 王晓明
水利学报,2002(5):91~96,-0001,():
-1年11月30日
在突扩突跌掺气设施中,为保证掺气效果,增加底空腔和侧空腔的长度,加设折流器是有效的工程措施。试验证明,折流器坡度和高度对空腔长度均有影响,较高的折流器增加空腔长度明显,且使底空腔与侧空腔贯通,有利于底空腔充分掺气,回溯水流使底空腔变短,有效空腔长度是影响掺气效果的重要因素。在空腔长度的计算中应综合考虑,顶板坡角,跌坎挑角和折流器体型的影响, 得出的计算公式有实际应用和理论意义。
掺气, 折流器, 底空腔, 侧空腔, 射流
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52浏览
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聂孟喜, 吴广镐
清华大学学报,2003,43(8):1116~1119,-0001,():
-1年11月30日
为深入研究突扩突跌掺气设施的掺气特性,在三峡工程深孔水工模型上对时均压强分布、掺气量、掺气浓度等进行了观测与分析。试验结果表明在侧墙形成4个区域,即:侧空腔区、压强骤变区、低压区和稳定区,侧空腔长度和侧墙时均压强均与折流器高度有关。在侧墙低压区有负压存在,其发生位置一般距孔口出口(等高程)约15m左右。在侧墙有少量掺气,掺气浓度在1.3%左右,掺气的主要原因是侧墙冲击点处产生的立轴漩滚对空气的卷吸作用。侧向折流器对掺气量有明显影响。侧、底空腔贯通时,侧空腔是一个重要的通气通道,是保证底空腔充分掺气的重要条件。此研究成果和结论可供突扩突跌掺气坎的设计和科研参考。
水工实验, 掺气, 折流器, 侧空腔, 底空腔
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65浏览
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【期刊论文】板桩码头计算机辅助设计系统(BZM TCADS)
聂孟喜, 李广大
港工技术,2000,6(2):28~31,-0001,():
-1年11月30日
对AutoCAD(ACAD)的开放式体系结构进行深入探索,利用ACAD提供的开发工具,结合板桩码头专业设计的特点, 研究开发了一套多功能、实用的计算机辅助设计系统。
计算机辅助设计(, CAD), , 开放式体系结构, 板桩码头
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65浏览
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【期刊论文】Outlet Conditions Causing Cavitation in the Invert of an Open Channel
聂孟喜, NIE Mengxi
TSINGHUA SCIENCE AND TECHNOLOGY, 1999, 20/22 (4): 1363~1366,-0001,():
-1年11月30日
This paper experimentally analyzes the causes of cavitation damage in the invert of an open channel. Results show that cavitation in the invert is mainly due to the maximum boundary shear occurring at the downstream tangential point of the invert, and the critical hydraulic condition causing cavitation occurs when the dimensionless parameter η=q/(gH3/2) is equal to 0.015. An improved configuration of the invert is then developed.
Cavitation, pressure drop, invert, irregularity, configuration
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【期刊论文】Fluctuant characteristics of two-phase flow behind a bottom aerator
聂孟喜, NIE Mengxi
SCIENCE IN CHINA (Series E), 2001, 44 (3): 291~297,-0001,():
-1年11月30日
Experimental observations show that the random process of two-phase flow behind an aerator is an ergodic process and its amplitude distribution is similar to a normal distribution. The maximum pressure fluctuation is at the re-attachment point where the jet-trajectory flow over the aerator reattaches to the bottom of the channel, and its amplitude is 2-3times larger than when there is no aerator. There is a dominant frequency of 1.24Hz in the model, but the coherence in the frequency domain is not obvious for other frequencies beside the dominant frequency. There is a large vortex at the re-attachment point behind the aerator but correlation among the measurement points is not obvious in the time domain.
pressure fluctuation,, bottom aerator,, ergodic process,, coherence function,, autocorrelation,, crosscorrelation function.,
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【期刊论文】Effect of Lateral Deflector on Outlet Cavity Lengths
聂孟喜, Meng-Xi Nie; Xu-Shenng Wang; and Guang-Hao Wu
,-0001,():
-1年11月30日
Experimental results indicate that an additional lateral deflector built on the outlet can incense the cavity length in aerators with a sudden vertical drop and lateral enlargement. Obsevation shows that the cavity length is affected by both the vertical and Lateral dimensions of the deflector. A larger deflector increases the cavity length substantially and connects the bottom cavity with the sidewall ones which results in more sufficient aeration. However. the backward flow on the bottom may reduce the length of bottom cavity and the effectiveness of aeration. Factors affecting the bottom cavity length, including the slope of the outlet, the bucket angle of sill. and the shape of lateral deflator, should be included in the estimation of the bottom cavity length. Based on test results. an equation has been proposed to predict the cavity length.
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【期刊论文】Comparison of Energy Dissipation with and without Aerators
聂孟喜, NIE Mengxi
TSINGHUA SCIENCE AND TECHNOLOGY, 2000, 22/24 (5): 222-225,-0001,():
-1年11月30日
Experimental results showed that a e rators increase the energy dissipation of the flow in the channel by reducing the velocity coefficientφin the deflector bucket and the jet-trajectory length, by increasing the nergy dissipation of the jet flow in the air and the diffusion length of the jet falling into the pooland by reducing the energy intensity of the jet falling into the pool. The energy dissipation prevents wash out downstream. When air is not entraine din the water flow, the aeratorsact as artificial irregularities in the channel. The energy dissipation due to the aerators in the channel without entrained air is greater than when air is entrained in the water flow. Correlations of the experimental data can be used to estimate the energy dissipation effect of the aerators on the outlets tructure for the three testcases.
energy dissipation, aerator, diffusion, jet-trajectory, open channel, energy intensity
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【期刊论文】CAVITATION PREVENTION WITH ROUGHENED SURFACE
聂孟喜, By Meng-Xi Nie
,-0001,():
-1年11月30日
Experiments show that a rough surface reduces the pressure drop and likelihood of cavitation downstream of the roughness. A rough surface upstreant of an irregularity significantly reduces the pressure drop caused by the irregularity. The effect of the rough surface is a function of the roughness d/s and can prevent cavitation damage. If an irrgularity is inevitable, increasing the roughness of the upstream surface in front of the irregularity will reduce the possibility of cavitation caused by the irregularity. For the curved open channel used in this study of the flow in a spillway, the critical height of the irregularity was increased six to eight times at the downstream tangential point of the curve, and the negative pressure caused by the irregularity was reduced enough to prevent cavitation.
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