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Browsing by Author "He, Jianming"

Now showing 1 - 11 of 11
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    Data Analysis and Numerical Modeling of Flow in the 1:14 Scale LCC Model
    (St. Anthony Falls Hydraulic Laboratory, 1989-06) Song, Charles C. S.; Yuan, Mingshun; Wang, Qun; He, Jianming
    A 1:14 scale model of the Large Oavitation Ohannel (LOO) was built and tested by Voith Hydro, Inc. [l]. The velocity profiles on the central plane of symmetry was surveyed using Pitot tubes at stations P1 to P7 as shown in Fig. 1. Later, additional measurements were made with LVD at stations Ll to L4 [2]. These measurements indicated the existence of unusually thick boundary layers on the top wall at the test section and poor flow quality in the diffuser when the honeycomb for turbulence management was present. Some improvements on mean velocity profiles were found possible by either completely or partially removing the honeycomb.
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    Hydraulic Transient Analysis of TARP Phase II O'Hare Tunnel System under Different Operating Plans
    (St. Anthony Falls Laboratory, 1997-10) He, Jianming; Charles C. S., Song
    The 0' Hare System of the Tunnel and Reservoir Plan (T ARP), which serves 11.2 square miles of combined sewers, as shown in Fig. 1, is the smallest of the four systems comprising the 352-square mile combined sewer services area operated by the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC).
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    Hydraulic Transient and Steady State Flow Analysis Using the WHAMO Model For the Chicagoland Underflow Plan (CUP) Evaluations
    (St. Anthony Falls Laboratory, 2000-10) He, Jianming; Stefan, Heinz G.
    The purpose of this work is to review the WHAMO transient flow model with the independent MIXTRAN model. The MIXTRAN model also provides necessary boundary conditions for WHAMO model. The WHAMO model was used to analyze the small tunnel filling and dewatering system associated with final design analysis regarding the Chicagoland Underflow Plan (CUP). The subcontractor, CDM International Inc., carried out the WHAMO analysis and prepared a Technical Memorandum, which is attached to this report. The WHAMO analysis results were reviewed by the primecontractor, St. Anthony Falls Laboratory, The University of Mimlesota. The primecontractor also analyzed two cases, case 5 and case 5B of CDM report, using the MIXTRAN model and compared the results with that of the WHAMO model. Agreement between the results of WHAMO model and MIXTRAN model for these two cases is good.
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    Hydraulic Transient Study of Fall River Tunnel System
    (1994-12) He, Jianming; Song, Charles C.S.; Liu, Ying
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    Hydraulic Transient Study of Mainstream & Des Plaines TARP Phase II Systems
    (St. Anthony Falls Hydraulic Laboratory, 1994-07) Song, Charles C. S.; He, Jianming; Liu, Ying; Gong, Cuiling
    Numerical studies of hydraulic transients for the TARP Phase I system were conducted in 1988. and 1992. These studies revealed that due to storage and/or conveyance limitation of the TARP Phase I Mainstream system, inflow must be substantially reduced to avoid geysering problems induced by hydraulic transients. Different inflow control solutions to different cases of the TARP Phase I were suggested in the previous project reports. TARP Phase II is designed to add additional water storage and increase the conveyance ability. This study is to investigate the extent and nature of hydraulic transients in Mainstream/Des Plaines TARP Phase II and to evaluate its design performance using computer modeling. The fully dynamic transient mixed flow mathematical model (MXTRANS) developed at the University of Minnesota was used for this study. To evaluate the hydraulic performance of the TARP Phase II System, including the Phase I Mainstream tunnel, Phase II Relief tunnel, and Phase I Des Plaines tunnel with or without four planned reservoir stages, four groups of modeling configurations for the systems as listed below are being considered Group A: Stage I Mainstream (Mainstream alone) Tunnel System Group B: Stage II Mainstream (Mainstream. With Relief Tunnel) System Group C: Des Plaines With or Without Mainstream System Group D: Interconnected Des Plaines and Mainstream Systems (Mainstream with Relief Tunnel and Des Plaines Tunnel)
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    Hydraulic Transient Study of Mainstream Tunnel System and Control System
    (St. Anthony Falls Hydraulic Laboratory, 1994-10) He, Jianming; Song, Charles C. S.; Liu, Ying; Cuiling, Gong
    Numerical studies of hydraulic transients for the TARP Phase I system were conducted in 1988 and 1992. These studies revealed that due to storage and/or conveyance limitations of the TARP Phase I Mainstream system using the Keifer/Song maximum hydrograph, inflow must be substantially reduced to avoid geysering problems induced by hydraulic transients. In order to improve the hydraulic transient condition, TARP Phase II has been proposed to add additional water storage and increase the conveyance ability. A hydraulic transient study for the TARP Phase II system was also conducted recently. However, before the TARP Phase II is completed, a reasonable tunnel operation method for the current TARP Phase I system must be sought to minimize the potential of the hydraulic transient problems. This study is to investigate the extent and nature of hydraulic transients in the current TARP Phase I Mainstream tunnel under the existing flow control structures for different hydrographs.
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    Hydraulic Transient Study of Narragansett Bay Commission CSO Storage Tunnel
    (St. Anthony Falls Laboratory, 1999-11) He, Jianming; Song, Charles C. S.
    One concern of the tunnel system is the potential for hydraulic transients during the tunnel filling process. Under some conditions, strong storm inflow to a tunnel may generate severe hydraulic surge in the tunnel, and consequently water may shoot up from the dropshaft like a geyser, which may result in structural damage to surface facilities and other environmental problems. For example, in Minneapolis, USA, a severe storm in 1997 caused a geyser 17 m above the ground from the storm water tunnel. The purpose of this study is to examine the possibility of any geysering and other hydraulic transient problems during the tunnel filling process based on the proposed tunnel configuration design and inflow under different tunnel operating conditions using our wellestablished hydraulic transient computer simulation model (MXTRANS).
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    Hydraulic Transient Study of Narragansett Bay Commission Tunnel System
    (St. Anthony Falls Laboratory, 1995-08) He, Jianming; Song, Charles C. S.; Liu, Ying
    The purpose of this study is to evaluate the hydraulic transient status in the proposed Narragansett Bay Commission (NBC) Tunnel System in north central Rhode Island. The tunnel system is designed as an off-line storage facility. As shown in Fig. 1, the tunnel system consists of Main Spine Tunnel and Seekonk Tunnel, as well as 18 dropshafts. For a larger storm, the inflow must be controlled to prevent overfilling. At a circumstance of inflow control gate failure at some dropshafts, the flows exceeding the storage capacity of the tunnel may overflow into the Mosshasuck River through an "extreme event overflow". This structure is proposed to be located in the vicinity of OF 009/010.
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    Hydraulic Transient Study of Passaic River Flood Protection Tunnel
    (St. Anthony Falls Hydraulic Laboratory, 1994-09) He, Jianming; Song, Charles C. S.; Liu, Ying
    The purpose of this study is to evaluate the hydraulic transient status in the proposed Passaic River Flood Protection Tunnel. The tunnel system is designed to convey flood waters from the upstream areas of Passaic River directly into Newark Bay. The tunnel consists of two upstream inlets, the Pompton Inlet and the Spur Inlet, and a 42 ft diameter main tunnel. The main tunnel length is about 20.1 miles (from the Pompton inlet to the downstream end). The distance between the Spur inlet and the main tunnel is about 1.2 miles. The tunnel system will be excavated from 150 to more than 400 ft under ground. From the hydraulic transient point of view, there are the following possible safety concerns in this tunnel system, which need to be evaluated using hydraulic transient computer. simulation program. (1) Surge phenomena induced during the initial filling stage. (2) Water hammer phenomena due to a sudden pressure change. (3) The effects of the surge and water hammer on the inlets, workshafts, and downstream outlet.
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    Mainstream and Des Plains TARP Tunnel System A Hydraulic Model Study
    (St. Anthony Falls Laboratory, 2002-01) He, Jianming; Song, Charles C. S.
    Numerical studies of hydraulic transients for the Phase I Mainstream system of the Tunnel and Reservoir Plan (TARP) were conducted in 1988 [1] and 1992 [2]. These studies revealed that due to storage and/or conveyance limitation of the TARP Phase I Mainstream system, flow must be substantially reduced to avoid geysering problems induced b'y hydraulic transients. Later in 1994 [3], hydraulic transient studies of the preliminary design of Mainstream & Des Plaines TARP Phase II systems were also conducted under various tunnel operation conditions. It was found that a reservoir at the downstream end does little help to reduce the transient problem in the Mainstream system due to the conveyance limitation during the simulated storm event. The main objective of this study is to investigate the hydraulic event which occurred in the TRAP system on June 1, 1999, resulting in flooding of the Dewatering Valve Chambers at the Mainstream Pumping Station, and damage to. the. mechanical and electrical equipment therein. The study uses District operation data, reports and findings, photographs of the damage, rain data, as-built facility plans, and all other available, applicable information to characterize the event. In addition to identifying the underlying causes of the event, the study is also to investigate the methods of operation of the Mainstream and Des Plaines T ARP tunnel systems, separately and in combination, to optimize CSO pollution capture while avoiding adverse hydraulic transient phenomena such as tunnel geysering, severe pressure surges, etc. in T ARP facilities. The study is also to identify possible additional and/or revised control features of the TARP system necessary to achieve the aforementioned optimum operation.
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    Numerical Simulation of Cavitating and Non-cavitating Flows over a Hydrofoil
    (St. Anthony Falls Laboratory, 1997-04) Song, Charles C. S.; He, Jianming; Zhou, Fayi; Wang, Ge
    The compressible hydrodynamic approach previously developed for small Mach number non-cavitating flows has been extended to simulate cavitating flows as well as non~cavitatingflows. The extension is made possible by assuming a complex equation of state relating density and pressure to cover the liquid phase and the gas phase. Thus, the cavitation phenomenon is regarded as a single-phase flow phenomenon enabling the elimination of the cavity closure condition. The numerical model is an unsteady 3~ dimensional flow model based on a large eddy simulation approach. It is applied to typical thin hydrofoils and thick hydrofoils at non~cavitating conditions and various cavitating flow conditions, including moving cavity, stable sheet cavity and sheet cavity/cloud cavity cyclical flow conditions. Computations are carried out primarily for 2-dimensional foils, but 3-dimensional flow characteristics are also examined. The computational results are compared with some available data; good quantitative and qualitative agreements are indicated. It is considered very significant that the sheet cavitation/cloud cavitation phenomenon is found to be similar to the viscous boundary layer flow separation/vortex shedding and washout phenomenon in many respects. Cavitation is found to trigger boundary layer separation in otherwise non- separated flow.