Abstract

Blades are the very important components of wind turbines in order to convert wind energy to mechanical or

electrical energy. Therefore, the aerodynamic forces acting on the horizontal wind turbine blades have an important role in

their performance. The objective of this paper is to investigate the aerodynamic characteristics and power generation

properties for a NREL PHASE VI wind turbine blade. For this purpose, an analysis procedure based on the Blade Element

Method (BEM) is demonstrated for a horizontal-axis wind turbine model (HAWT), and the methodology approach is discussed

in detail throughout this paper. In this study, a Math Lab code has been developed for analyzing a model of Horizontal-Axis

Wind Turbine (HAWT) in order to display aerodynamic behaviour on the blade. The NACA S809 airfoil was selected for the

analysis of the wind turbine blade, where the tip and root losses proposed by Prandtl are also executed. The calculated results

are validated using Q-Blade commercial software at rated wind speed of 10 m/s and show that the BEM is a good method of

aerodynamic investigation of a HAWT blade

Abstract

This project investigated the stresses developed in a thick-walled cylinder for rocket motor case

under internal pressure. Stress analysis used the finite element method with ANSYS software for

rocket motor case selection. This study focus on structural elastic analysis of thick-walled pressure

vessels since it is a common design practice to aim at maintaining the induced stresses within the

elastic region. However, pressure vessels operate under complex environments such as high

pressure which may lead to gross plastic deformation and subsequent failure. In process, the

pressure vessel is pressurized beyond the yield point. As a result, the conventional elastic analysis

will not be applicable at internal pressures above the yield point. Therefore, it is important to

examine the structural integrity of a thick-walled pressure vessel in both elastic and plastic state

of the material.

In this study, FE static structural analysis of a presumably untracked thick-walled solid rocket

motor case has been presented, where stress distribution within the motor case wall and the

resulting material deformation were investigated using ANSYS 19.2. Motor case has been designed

with uniform model of the same internal and external diameter, and motor case with diameter

change at both sides is modeled to investigate the effect of the diameter change or shape

discontinuity on the resulting of stresses and deformation using ANSYS program by applying

internal pressure varying from 50 Bars to 350 Bar. Von Mises yield criteria were used by ANSYS

program and calculated Von Mises stresses were compared; the results are close for elastic

analysis. The results show that the Von Mises stresses was high for discontinues shape of motor

case compared by the uniform motor case (constant thickness).

It has been noted the wide spread of the use of composite materials due to their specific strength that made them the best alternative to many other materials,However, the high cost of synthetic fibers represents an obstacle to the use of composite materials in most applications. Therefore, research has tended to test natural fibers, which are the ideal solution for using composite materials in many industries such as furniture, flooring, decoration, and others. This paper concerned with the study of natural composite materials made of Libyan almond shells. Three different sizes of ground almond shells were studied: large size in the form of grains, medium size, and the small size (powder form). These crushed peels were mixed with the resinous polyester resin in four proportions: ratio of 80: 20, 60: 40, 40: 60, and 20: 80. Three basic tests were conducted to investigate the mechanical properties of the samplesIt has been noted the wide spread of the use of composite materials due to their specific strength that made them the best alternative to many other materials, However, the high cost of synthetic fibers represents an obstacle to the use of composite materials in most applications. Therefore, research has tended to test natural fibers, which are the ideal solution for using composite materials in many industries such as furniture, flooring, decoration, and others. This paper concerned with the study of natural composite materials made of Libyan almond shells. Three different sizes of ground almond shells were studied: large size in the form of grains, medium size, and the small size (powder form). These crushed peels were mixed with the resinous polyester resin in four proportions: ratio of 80:20, 60:40, 40:60, and 20:80. Three basic tests were conducted to investigate the mechanical properties of the samples: impact test, tensile test, and flexural test. The results showed that samples made of almond peels in a powder form exhibits the best results among all other kind of specimens for three mentioned tests of mechanical properties.

ABSTRACT

This article presents another method to improve the performance

and efficiency of a gas-fired power plant in Al-Zawia, Libya. In

order to improve power plant efficiency and increase power, the

principle of a heat recovery steam generator (HRSG), which is

mainly based on the waste heat energy of exhaust gases generated

by a simple gas turbine unit, is a method that can be used for

improvement. The present system was simulated using Aspen

HYSYS software. For validation purposes, the simulation results

were compared with the actual operating data, net power and

thermal efficiency of the cycle under the same conditions. These

results show a high level of agreement between theoretical and

practical data. This agreement enables and provides good

implementation to use this software to simulate an entire combined

cycle. In addition, operating parameters that influence power plant

performance were examined. The results show that the combined

cycle improved the thermal efficiency and net power output by

49.8% and 50%, respectively, under the same operating conditions.

The results also showed that compressor pressure ratio and inlet air

temperature have significant effects on thermal efficiency and net

power produced in both simple and combined power plants

Abstract:

This paper explores the utilization of ANSYS software to replace traditional stainless steel in

Liquid Natural Gas (LNG) cylinders with a lightweight composite material called E Glass Epoxy.

The goal is to reduce the cylinder's weight through finite element analysis using ANSYS, adhering

to Libyan market standards. Stresses under internal pressure are analyzed and compared with

analytical solutions for steel cylinders. The study highlights weight reductions for steel and

composite LNG cylinders, emphasizing the practicality, utility, and safety considerations in

addressing the challenges faced by the Indian Gas supply system, especially for housewives

dealing with heavy stainless steel cylinders.

This project aims to provide a user-friendly alternative, maintaining gas storage efficiency while

significantly reducing cylinder weight

Abstract--

This paper presents the study if could design of a hydroelectric power station utilizing dam resources in the Western Mountain

region of Libya. Monthly data spanning three years was analyzed for each dam, focusing on energy production comparisons between

Wadi Ghan and Wadi Majinin dams from 2010 to 2012. Key factors examined include dam size, height, and water storage capacity, all

impacting energy production efficiency. Designed with a targeted production capacity of 30 MW per day, the project incorporates pumps

to recycle discharged water, preventing loss and optimizing resources. Data analysis was conducted using Excel. The economic viability

of the project is promising, as the station will enhance regional electricity supply while reducing dependence on conventional energy

sources. As a renewable and clean source, hydroelectric power minimizes harmful emissions and mitigates negative environmental

impacts. Establishing the station is also expected to support local infrastructure, stimulate the economy, and create job opportunities. In

the operational phase, hydroelectric power generation is anticipated to have lower costs compared to traditional energy

sources.Furthermore, raising the dam's water level is projected to boost energy output by increasing storage capacity and enhancing

hydrostatic pressure on the turbines, thus improving turbine efficiency and overall energy generation. These optimizations align with the

project’s objectives, contributing to increased energy output, economic viability, and the enhanced performance of the hydroelectric power

station

It has been noted the wide spread of the use of composite materials due to their specific strength that made them the best alternative to many other materials, However, the high cost of synthetic fibers represents an obstacle to the use of composite materials in most applications. Therefore, research has tended to test natural fibers, which are the ideal solution for using composite materials in many industries such as furniture, flooring, decoration, and others. This paper concerned with the study of natural composite materials made of Libyan almond shells. Three different sizes of ground almond shells were studied: large size in the form of grains, medium size, and the small size (powder form). These crushed peels were mixed with the resinous polyester resin in four proportions: ratio of 80:20, 60:40, 40:60, and 20:80. Three basic tests were conducted to investigate the mechanical properties of the samples: impact test, tensile test, and flexural test. The results showed that samples made of almond peels in a powder form exhibits the best results among all other kind of specimens for three mentioned tests of mechanical properties.

In many missions of rotating machines such as compressors, engines, turbines and large centrifugal pumps use Journal bearings to support and guide rotating shafts due to the high load capacity of this type of bearing. The effect of operating conditions on heavy duty in the journal bearings will degrade machine performance, reduce life time and increase risk. The application of high-frequency Acoustic Emissions AE signals is used to carry information about the details of the micro-collision process. Furthermore, the AE for journal bearing diagnosis is gaining acceptance as a useful complementary tool for the condition monitoring. The experimental investigation has been conducted to demonstrate the effect AE characteristics of the journal bearing in different critical operating conditions. The parameters rotational speed and radial load as well as different lubricant viscosity are mainly measured. For the overcoming occurrence of the bearing failures a comprehensive monitoring method has developed between friction in asperity contact and energy release of AE signals for journal bearing. A mathematical model is applied in order to obtain an insightful understanding of the influences operating parameters on the energy of AE generated in rolling element bearing. The obtained results showed that the potential of AE technology and data analysis method applied for monitoring the asperities contact condition in journal bearings, which will be vital for developing a comprehensive monitoring system, supporting the optimal design by simulating the Stribeck curve and operation of journal bearings. 

Pressure vessels are an important part of the industrial world and therefore hold a special interest from mechanical engineers. The main objective of using the pressure vessels are used as containers to contain many of materials such as: liquids, air, gases, chemical compounds and fuel. In this study, a horizontal pressure vessel holding 10 m3 of pressurized Liquid Propane Gas (LPG) is designed, modeled, simulated and analyzed by following the American Society of Mechanical Engineers (ASME) standard for the design

Abstract

in this paper, (CFD) Computational Fluid Dynamics was used for a detailed burner design by the software Fluent (ANSYS). However, a number of numerical simulations were performed on a generic swirl burner and turbulence flow selection of a non-premixed which using syngas. However, non-premixed flames which characterized by relatively high temperatures, high NOx concentrations, and emission indices. The results showed that the presence of methane in syngas increases the peak flame temperature and the thermal NOx, significantly. Therefore, Investigation showed that effecting of H2, CO, and N2 contents in the fuel mixture level NOx emissions, thus the present compositions for pure methane are respectively influenced on syngas1 by (10% CH4, 45% H2, 45% CO) , syngas2 by (50% CH4, 10% H2, 40%N2) and syngas3 (60% CH4, 20% H2, 20%N2).