Particle impact prediction of an archimedes screw runner blade for micro hydro turbine

Energy is one of the important sources in the world and important for developing countries. In rural and remote areas, transmission and distribution of energy generated from fossil fuels can be difficult and expensive and producing renewable energy such as water turbine can locally offer a viable alternative. The subject study is conducted to investigate the flow behaviour of water inside the turbine and predict the impact of particle towards blade surface. For this reasons, computational fluid dynamics (CFD) methods are used. The three-dimensional flow of fluid is numerically analysed using the Navier-Stokes equation with standard k-ε turbulence model by applying some boundaries condition such as steady state flow condition, isentropic flow and isothermal temperature. The numerical results such as velocity streamlines, flow pattern and pressure contour for flow of water entering the blade are compared with the experimental results which obtained by other researches. This study shows that the prediction of particle impact occurs mostly on the entering surface blade and along the leading edge of the screw runner. Any modification on the design of the screw runner blade can be analyse for further study

Archimedes screw pump efficiency based on three design parameters using computational fluid dynamics software – Ansys cfx

Utilization of Archimedes screw pumps as water lifting pumps has become widespread in past decade due to frequent occurrences of floods in Malaysia. The problem of insufficient drainage in various urban areas exacerbates the impact of heavy rainfall, prompting efforts to mitigate this issue with minimal maintenance cost and low impact to the environment. Thus, this study is aiming to study the design parameters of screw pump to obtain the optimal efficiency of the Archimedes screw pump specifically for flood mitigation in Malaysia. The main design parameters affecting pump's efficiency are rotor profile, pitch length, length of the pump, rotational speed, inclination angle, and material selection. However, only three design parameters were considered in the study, that are the angle of inclination, the number of blades, and the angular velocity of the rotating pump. These three design parameters are selected as many previous findings focusing on varying angle of inclination with number of blades with constant rotational speed. Thus, this study will find the highest efficiency when these three design parameters are integrated with variation of rotational speeds at 25, 30 and 40 RPM. Basically, screw pump is designed using SOLIDWORKS and simulations with specific boundary conditions are conducted using the ANSYS-CFX software, which utilizes computational fluid dynamics (CFD) techniques. These boundary conditions are based on previous study by Rosly et al in 2016. The inlet flow rate of 0.002 m3/s and diameter of the screw pump are constant while the other three main parameters are varying within the acceptable ranges which are reported from prior studies. The outcomes found that the highest torque is generated by a single rotating blade at 5.65 Nm which rotates at 30 RPM at 30° angle of inclination. Meanwhile, the highest efficiency of 24.04% is obtained with a single rotating blade at 40 RPM with 20° angle of inclination. Based on the findings, it is concluded that these three main design parameters of screw pump may not be sufficient to obtain the optimal efficiency for the specific boundary conditions used in the simulation study. Thus, several combinations of design parameters should be considered in the future to increase the screw pump's efficiency

Archimedes screw turbine model simulation on the effect of external and internal design parameters in power generation

Year after year, electricity demand increases due to the world's rapid growth, which uses electricity as its main source of energy. In order to overcome the challenge of generating electricity from conventional energy resources that contribute to the greenhouse effect, renewable energy is in demand. One of the alternatives to generating electricity in a clean environment is the Archimedes screw turbine (AST). The objective of this research study is to investigate the AST slope inclination angle, diameter ratio, and number of bladed screws based on previous design concepts for power generation and determine the power output and highest efficiency based on the internal and external parameters. This research is aimed at studying the AST design concept for generating electricity. The design concept was analysed based on the geometric parameters, which were then validated between the simulation and actual data. Three parameters considered in this research were the slope inclination angle, α ratio of diameter, Dr and number of bladed screws, N. Each parameter affects the AST power generation significantly. The simulation of the AST design concept was carried out using ANSYS CFX. The simulation was divided into several steps, such as validation between the simulation and experimental data, and simulation of the AST using three different parameters at a constant flow rate and rotational speed. A total of 36 simulations were run based on constant flow rate with a number of bladed screws of 1,2 and 3, with a diameter ratio of 0.25,0.5 and 0.6 combined with a slope inclination angle of 20°, 25°,35° and 40°. From the simulation, the highest power of 2.3W was produced at 1 bladed screw, 0.5Dr and 40°, whereas the highest efficiency (79.42%) occurred at 3 bladed screws, 20° and 0.25Dr. Each of the designs of the parameter studies impacted the power production and efficiency of AST

Parametric Study on Efficiency of Archimedes Screw Turbine

Production of electrical power through the use of the gravitational force and flowing water or electricity generated by power derived from the potential energy and running water is called hydroelectricity. The subject study is conducted to identify the potential parameters and desirable design for Archimedes Screw Turbine that has high power efficiency. Therefore, computational fluid dynamics (CFD) methods are used. By applying some boundaries condition such as steady state flow condition, isentropic flow and isothermal temperature, the simulation of water flow in the screw turbine can be shown and can be analyzed. This study shows that the higher number of helixes will decrease the efficiency of the screw turbine. Any modification in the design of the screw runner blade can be analyze for further study

Prediction of Particle Impact on an Archimedes Screw Runner Blade for Micro Hydro Turbine

Energy is one of the most important sources in the world especially for developing countries. The subject study is conducted to predict the behaviour of particle due to errosion from the river through the achimedes screw runner and predict the impact of particle toward blade surface. For this reason, computational fluid dynamics (CFD) methods are used. The three-dimensional flow of fluid is numerically analyzed using the Navier-Stokes equation with standard k-ε turbulence model. The reinverse design of archimedes screw blade was refered with the previous researcher. Flow prediction with numerical results such as velocity streamlines, flow pattern and pressure contour for flow of water entering the blade are discussed. This study shows that the prediction of particle impact occurs mostly on the entering surface blade and along the leading edge of the screw runner. Any modification on the design of the screw runner blade can be analyze for further study

Investigation on the Effect of Drive Train System for Archimedes Screw Turbine

Nowadays, the Archimedes screw turbine has become one of alternative in generating electricity. It is low in terms of cost and sourceful as the Earth is covered more than 70% of water. The objective of this study is to investigate the effect of the drive train system that may influence, power generated from the Archimedes screw turbine. This paper focused on studying the relationship between drive train system and rotational speed. An experiment was conducted with two different types of drive train system to compare the rotational speed of the turbine at the same flow rate range from 0.012 m³/s to 0.016 m³/s (diameter of driver Pulley A is 102mm and diameter of driver Pulley B is 150mm). By increasing the diameter of the driver pulley up to 150mm, the maximum power generated of 0.444 Watts at low rotational per minutes (RPM) of 70. In conclusion, increase the diameter of driver pulley requires low RPM to produce maximum power output

The Effect of Substantive Parameters On The Efficiency Of Archimedes Screw Microhydro Power: A Review

Due to the increasing demands in electricity and decreasing in fossil fuels sources, then hydropower are being developed and most of the project involve with large dams construction and may cause the people live surrounding to be flooded. Hence, the construction of Archimedes screw runner blade turbine can be the best option to generate energy without cause too much environmental impact like a fish friendly turbine and low maintenance cost. This review focus on the parameters that affected the performance of turbine. Besides the review also presented a methodologies based on parameters studied by previous researcher and from that review, it has been found that the uses of external parameter have an effect on the internal parameter in terms of efficiency. In further investigation, another parameter such as gap leakage, velocity of water, blade thickness should be considered to investigate the relationship of efficiency

Predicting Errosion Pattern on Archimedes Screw Runner Blade of Hydro Power

One of the fundamental studies of Micro hydro power with low head is the Archimedes screw runner. This research focuses on the study of behaviour of fluid flow acting on the Archimedes screw runner blade and prediction of erosion pattern from fluid flow. The CAD model of the Archimedes screw blade was re-inversely design from past researcher. In order to determine the flow pattern, computational fluid dynamic, CFD was used to obtain the pressure distribution along blade structure. Analysis of three-dimensional with steady state flow was done with a standard k-ε as the turbulence model. The result obtained from pressure pattern shows that the highest value of coefficient of pressure obtained at the blade tip. This result shows that the prediction of crack may occur mostly at the blade tip. Further studies of blade design can be improved by reducing crack