Ahmed Mahmood Abdullah Daabo

University of Mosul · College of Petroleum & Mining Engineering

Small-Scale Turbines (SSTs) are among the most important energy-extraction-enabling technologies in domestic power production systems. However, owing to centrifugal forces, the high rotating speed of SSTs causes excessive strains in the aerofoil portions of the turbine blades. In this paper, a structural performance analysis is provided by combinin...

This study is geared toward generating highly stabilized partially premixed flames at various levels of turbulence and partially premixing. Therefore, with the help of the laser-induced breakdown spectroscopy (LIBS) technique, a new burner was constructed and employed to quantitatively estimate the mixture equivalence ratio (Φ) within the flame. Tw...

From an environmental and economic perspective, converting harmful waste materials into value-added products is very important. This work explores using an equal mixture of chicken waste (CW) and chicken bones (CBs) as a raw material for creating more valuable products. The CW (chicken skin and fat) were de-fatted, and their solid residue leftover...

Despite the fact that concentrated solar power technology was first studied about 55 years ago, it is only in recent times that this knowledge has attracted the attention of both investors and researchers all over the world. The turbine is considered to be one of the most important components of any power cycle, and it always needs to be improved t...

Energy demand in the present scenario is rising to meet the increasing demands of energy usage. On the other hand, the use for renewable energy sources now becomes essential to mitigate the climate change as well as to reduce gradual depletion of fossil fuels. Among these renewable energy sources, solar energy particularly solar thermal systems hav...

The current research paper focuses on the physico-chemical optimization’s parameters for the Microwave Assisted Extractive/ Oxidative Desulfurization (MAEOD) of a real Algerian diesel. The oxidative desulfurization was carried out using vanadyl acetyl acetonate as catalyst, hydrogen pyroxide (30%) as oxidant and an acid Bronsted Ionic Liquid (IL) i...

The scope of this study was twofold: to define the most suitable Egypt's biodiesel source, and to assess the impact of this biodiesel source with the addition of carbon nano additives on diesel engine performance and emissions. Environmental Key Performance Indicators were used as metrics to identify the appropriate biodiesel source with respect to...

The solar dish-micro gas turbine system is a new alternative to the existing technologies for small-scale power production (< 100 kW) in rural off-grid areas. In these solar-only systems, the short-term thermal energy storage in the solar receiver reduces the effect of natural fluctuations of the solar flux and ensures the stable working fluid (WF)...

Despite the fact that concentrated solar power technology was first studied about 55 years ago, it is just in recent times that this knowledge has achieved the attention of both investors and researchers all over the world. The turbine is considered to be one of the most important components of any power cycle, and it always needs to be improved to...

axial turbine operated with the Brayton cycle, at various boundary conditions, by using the numerical integration finite element method and 3D computational fluid dynamics; the stresses on the rotor blade, in particular, were investigated. Firstly, the turbine was designed with a power output of 0.5–1 kW and efficiency of 81.3%. Then, together the...

Studies on improving the performance of clean and renewable energy, such as those focusing on concentrated solar energy, have intensified in recent years. This research paper studies the effect of the cylindrical cavity thermal receiver shape on the performance of a small scale solar Brayton cycle application. Moreover, it determines the optimum sh...

Developing small scale turbines pauses challenges in terms of increased stresses due to high rotational speed leading to increase in component thicknesses and turbine overall weight. Therefore this study assesses both; the structural and aerodynamic performance of a Small Scale Radial Turbine SSRT by integrating finite-element methods FEM and Compu...

The existing literature pays limited attention to the design and 3D analysis of small-scale axial and radial–outflow turbines that can be utilised in Organic Rankine Cycles (ORC) for power generation with a low–temperature (<100 °C) heat source and low mass flow rate. Turbine efficiency significantly affects an ORC’s efficiency because the turbine...

A low cost solar collector with a dish reflector and spiral absorber is examined in this work. This collector is investigated experimentally and numerically with a developed thermal model in the Engineering Equation Solver (EES). Numerical simulations are performed by the commercial software OptisWorks. The solar ray distribution inside these recei...

In the current work two types of turbines, axial and radial turbine, with their three configurations, Single Stage Axial, Dual Stage Axial and Single Stage Radial turbines, for solar Brayton cycle applications have been parametrically investigated with the aim of figuring out their performance in terms of efficiency and power output. The mean line...

Day after day the interest in the renewable clean energy is increasing because of the enormous advantages that it has. One of the main forms for the renewable energy is the solar which has been used through power systems such as the Concentrated Solar Power (CSP), which shows a remarkable enhancement recently. The current study examines different a...

Numerical simulation was carried out to optimize the design of a small-scale radial turbine. One-dimensional (1D) Mean Line (ML) approach and three-dimensional computational fluid dynamic (3D CFD) simulations, using 3D Reynolds-Averaged Navier-Stokes (RANS) models with the shear stress transport (SST) turbulence model in ANSYS®15-CFX, were employed...

Small scale open solar thermal Brayton cycle with Concentrated Solar Power (CSP) system can provide an efficient, clean, sustainable and low cost energy conversion system to produce different forms of energy such as electricity. The current paper investigates various configurations of open cavity solar receivers including cylindrical, conical and s...

Most studies on the organic Rankine cycle (ORC) focused on parametric studies and selection working fluids to maximize the performance of organic Rankine cycle but without attention for turbine design features which are crucial to achieving them. The rotational speed, expansion ratio, mass flow rate and turbine size have markedly effect on turbine...

The researchers’ main target in this work is to demonstrate the performance of small-scale (5–45 kW) axial and radial compressed air turbines which are able to operate at specific boundary conditions. These boundary conditions were chosen to be compatible with a small-scale solar powered Brayton cycle. The evaluation is dependent on the turbines’ e...

Concentrated Solar Power (CSP) can be used as an efficient low cost energy conversion system to produce different types of energy, such as electricity, through the use of concentrated parabolic dish systems. In the study of CSP, most of the researchers focus on the heat losses and their relationships to the receivers' geometries. The present study...

The demand for energy is continually increasing day after day; but at the same time, investigations around the world into sustainable sources of power are growing in number. Concentrated Solar Power (CSP) can act as an efficient low cost energy conversion system to produce electricity which could lead to reducing the continuous demand on convention...

Eccentricity problem is considered as one of the most important and common repeated problems in rotary shafts in all machines. This will lead to generation of vibration and extra loads on bearings. Also a non-uniformity can occur in distribution of applied load on all the surface of the bearing which being concentrated on one or two sides of the be...