Hydraulic Performance Optimization on Inlet-Outlet of Pumped Storage Plant

2013 ◽  
Vol 405-408 ◽  
pp. 491-494
Author(s):  
Ya Nan Gao ◽  
Jun Nan Yi ◽  
Rui Cun Zhao ◽  
Li Fen Chen ◽  
Xu Min Wu
Keyword(s):  
Numerical Simulation ◽  
Performance Optimization ◽  
Flow Distribution ◽  
Head Loss ◽  
Hydraulic Performance ◽  
Flow Coefficient ◽  
Head Loss Coefficient ◽  
Uniform Flow Distribution ◽  
Orifice Flow ◽  
Pumped Storage

This paper, using 3-D numerical simulation and the hydraulic model tests, presents an analysis on hydraulic performance of pumped storage plant inlet/outlet. It discusses the uneven flow coefficient, coefficient of orifice flow distribution and head loss coefficient of inlet/outlet in different sizes. The optimized size has a uniform flow distribution, with less to produce unwanted eddies.

Optimal design and performance analysis of hydraulic ram pump system

2018 ◽  
Vol 232 (7) ◽  
pp. 841-855 ◽  
Author(s):  
Xinlei Guo ◽  
Jiazhen Li ◽  
Kailin Yang ◽  
Hui Fu ◽  
Tao Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Optimal Design ◽  
Performance Analysis ◽  
Head Loss ◽  
The Novel ◽  
Pump System ◽  
Head Loss Coefficient ◽  
Distribution Uniformity ◽  
And Performance ◽  
Eccentric Distance

Hydraulic ram pump is an automatic water-pumping equipment generally used to pump drinking and irrigation water in mountainous and rural areas having short of power. In the past, it has been analyzed and optimized by fabricating various prototypes and conducting experiments and comparisons. This process is time and labor consuming and detailed flow features cannot be determined except efficiency, discharge, and period. In this paper, a method for the optimal design and performance analysis of hydraulic ram pump system with numerical simulation and physical experiment is presented to shorten the number of prototypes and develop high-performance product. The proposed evaluation indexes include head loss coefficient, drag coefficient, eccentric distance of pressure, and velocity distribution uniformity. Two types of structures, named front-enlargement and back-enlargement, were initially designed. According to the numerical simulation, the latter one has lower head loss coefficient and drag coefficient, larger eccentric distance of pressure and higher velocity distribution uniformity and was adopted in the novel hydraulic ram pump. Then, the design theory and method on adjustable and high-head experimental platform have been developed, so that the delivery head can be easily controlled and regulated in laboratory. Experiments were carried out for the delivery heads of 2.0 m and 2.7 m and comparisons were conducted with other products. The results show that, when the delivery head is less than 50 m, the efficiency of the new product ranges from 50% to 70% while the delivery flow is the largest. Its application in Liangshui River, Beijing, indicates that the novel hydraulic ram pump is a practical tool in fountain sight and for irrigation purpose without external power input.

Numerical Simulation for Hydraulic Characteristics of MLIS Hydropower Station

2013 ◽  
Vol 353-356 ◽  
pp. 2487-2491 ◽  
Author(s):  
Yuan Ding ◽  
Tong Chun Li ◽  
Min Zhe Zhou
Keyword(s):  
Numerical Simulation ◽  
Surface Water ◽  
Flow Velocity ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Head Loss ◽  
Hydropower Station ◽  
Hydraulic Characteristics ◽  
Multi Level ◽  
Intake Structure

Combined with a multi-level intake structure, using the standard two-equation turbulence model to carry on the three-dimensional numerical simulation for the hydraulic characteristics of this intake .The flow velocity, fluid flow distribution and head loss were analyzed and summarized. The vertical velocity distribution near the intake has been significantly changed after placed stop log gate, the flow velocity of the reservoir surface water near the intake increases significantly, more surface water enter the power plant unit, and the head loss increases greatly.

Towards Direct Numerical Simulation of Compressible Orifice Flow

2013 ◽  
Author(s):  
Bernhard Manhartsgruber
Keyword(s):  
Numerical Simulation ◽  
Stationary Flow ◽  
Parameter Tuning ◽  
Good Choice ◽  
Fluid Power ◽  
Model Complexity ◽  
Hydraulic Systems ◽  
Vast Number ◽  
Lumped Parameter ◽  
Orifice Flow

Simulation methods from simple lumped parameter approaches to complex computational fluid dynamics codes have become a widely used tool in the fluid power community. Certain tasks like the predicition of flow forces on the control spools in valves or the design of port plates in axial piston pumps are usually treated by the aid of numerical simulation. Like in many other cases, the underlying principle is the control of flow by orifices. The importance of orifice flow for hydraulic systems is reflected by the vast number of publications on various aspects of orifice flow in the fluid power literature. In lumped parameter simulations, the orifice equation giving the flow rate as a square root of the pressure drop is widely used even in transient cases where it is not clear whether the flow develops fast enough to justify the assumption of stationary flow. On the other end of the model complexity spectrum computational fluid dynamcis codes are used in the fluid power community. These very complex models require a high number of parameters for the tuning of turbulence models, wall models, and the like. The quality of the results heavily dependes on a good choice for these parameters. Additionally, the vast majority of turbulent flow simulations is done with the assumption of an incompressible fluid. Very often, the results from simulations deviate heavily from measurement results and only after parameter tuning a good match between model and simulation is achieved. This paper suggests the use of direct numerical simulations for simple and prototypical geometries in order to gain a better understanding for transient orifice flows lacking the fully developed flow assumed in traditional models.

Hydraulic Characteristics of the New Type Bulb Turbine With Micro-Head

2013 ◽  
Author(s):  
Lingyu Li ◽  
Yuan Zheng ◽  
Daqing Zhou ◽  
Zihao Mi
Keyword(s):  
Numerical Simulation ◽  
Cfd Simulation ◽  
Guide Vane ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Three Dimensions ◽  
Guide Vanes ◽  
Runner Blade ◽  
Cfd Method ◽  
Bulb Turbine

The head of low-head hydropower stations is generally higher than 2.5m in the world, while micro-head hydropower resources which head is less than 2.5m are also very rich. In the paper, three-dimensional CFD method has been used to simulate flow passage of the micro-head bulb turbine. The design head and unit flow of the turbine was 1m and 3m3/s respectively. With the numerical simulation, the bulb turbine is researched by analyzing external characteristics of the bulb turbine, flow distribution before the runner, pressure distribution of the runner blade surface, and flow distribution of the outlet conduit under three different schemes. The turbine in second scheme was test by manufactured into a physical model. According to the results of numerical simulation and model test, bulb turbine with no guide vane in second scheme has simpler structure, lower cost, and better flow capacity than first scheme, which has traditional multi-guide vanes. Meanwhile, efficiency of second scheme has just little decrease. The results of three dimensions CFD simulation and test results agree well in second scheme, and higher efficiency is up to 77% which has a wider area with the head of 1m. The curved supports in third scheme are combined guide vanes to the fixed supports based on 2nd scheme. By the water circulations flowing along the curved supports which improve energy transformation ability of the runner, the efficiency of the turbine in third scheme is up to 82.6%. Third scheme, which has simpler structure and best performance, is appropriate for the development and utilization of micro-head hydropower resources in plains and oceans.

Sign in / Sign up

Export Citation Format

Share Document