Yazar "Ghazal, Rabeea M." seçeneğine göre listele

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    Effects of nano-additives in developing alternative fuel strategy for CI engines: A critical review with a focus on the performance and emission characteristics
    (Elsevier, 2024) Hamzah, Ameer Hasan; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul; Ghazal, Rabeea M.; Alhamd, Abdulrahman E. J.; Bdaiwi, Mothana
    Compression ignition (CI) engines are widely used in transportation and industry due to their reliability and high thermal efficiency. On the other hand, the use of CI engines coincides with the emission of harmful pollutants, and to address these problems, researchers were interested in studying the use of different types of fuel and additives, such as biodiesel, ethanol, and nanoparticles. Generally, there are increasing views that adding Nanoadditives to fuel improves the thermo physical properties and helps enhance combustion characteristics. More so, the investment of Nano-fuel additives generally leads to premature combustion and accelerated ignition of the fuel charge inside the engine cylinder. What's more, the optimal amount of Nano fuel additives is associated with improvements in ignition characteristics and reduced exhaust emissions. This review concentrated on recent advancements in the use of nanoparticles, specifically different types from Nanoparticles, as a diesel fuel additive, including experimental and theoretical analyses. This study's findings can contribute to the development of a more efficient and environmentally friendly diesel engine technology. Finally, potential mechanisms underlying improvements in diesel properties and combustion are also reviewed and discussed.
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    Exergo-Economic and Parametric Analysis of Waste Heat Recovery from Taji Gas Turbines Power Plant Using Rankine Cycle and Organic Rankine Cycle
    (Mdpi, 2023) Kareem, Alaa Fadhil; Akroot, Abdulrazzak; Wahhab, Hasanain Abdul A.; Talal, Wadah; Ghazal, Rabeea M.; Alfaris, Ali
    This study focused on exergo-conomic and parametric analysis for Taji station in Baghdad. This station was chosen to reduce the emission of waste gases that pollute the environment, as it is located in a residential area, and to increase the production of electric power, since for a long time, Iraq has been a country that has suffered from a shortage of electricity. The main objective of this work is to integrate the Taji gas turbine's power plant, which is in Baghdad, with the Rankine cycle and organic Rankine cycle to verify waste heat recovery to produce extra electricity and reduce emissions into the environment. Thermodynamic and exergoeconomic assessment of the combined Brayton cycle-Rankine cycle/Organic Rankin cycle (GSO CC) system, considering the three objective functions of the First- and Second-Law efficiencies and the total cost rates of the system, were applied. According to the findings, 258.2 MW of power is produced from the GSO CC system, whereas 167.3 MW of power is created for the Brayton cycle (BC) under the optimum operating conditions. It was demonstrated that the overall energy and exergy efficiencies, respectively, are 44.37% and 42.84% for the GSO CC system, while they are 28.74% and 27.75%, respectively, for the Brayton cycle. The findings indicate that the combustion chamber has the highest exergy degradation rate. The exergo-economic factor for the entire cycle is 37%, demonstrating that the cost of exergy destruction exceeds the cost of capital investment. Moreover, the cost of the energy produced by the GSO CC system is USD 9.03/MWh, whereas it is USD 8.24/MWh for BC. The results also indicate that the network of the GSO CC system decreases as the pressure ratio increases. Nonetheless, the GSO CC system's efficiencies and costs increase with a rise in the pressure ratio until they reach a maximum and then decrease with further pressure ratio increases. The increase in the gas turbine inlet temperature and isentropic efficiency of the air compressor and gas turbine enhances the thermodynamic performance of the system; however, a further increase in these parameters increases the overall cost rates.
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    PREDICTION OF PREMIXED FLAMES CHARACTERISTICS OF LIQUEFIED PETROLEUM GAS (LPG) / HYDROGEN GAS MIXTURES
    (Taylors Univ Sdn Bhd, 2023) Ghazal, Rabeea M.; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul
    The laminar burning velocities of liquid petroleum gas (LPG)-hydrogen-air mixtures are emphasized. They play a crucial role in designing and predicting combustion progress and the performance of combustion systems that utilize hydrogen as fuel. This work uses laminar burning velocities of different compositions of Iraqi LPG-hydrogen-air mixtures (4 and 10 vol.%). The measurements have been taken at ambient temperature and pressure for various equivalence ratios (phi = 0.21 to 1.23). A counter combustor with a symmetrical premixed flame is suggested to enhance stability efficiency and temperature distribution and improve heat transfer with hydrogen gas addition at different percentages. The results have been demonstrated by an increase in the hydrogen concentration within hydrogen-LPG mixtures (0, 4, and 10%vol. of hydrogen) leads to a significant increase in both flame temperature (1070, 1100, and 1154 K) and burning velocities (26.7, 33 and 49.5 cm/s) respectively. Adding hydrogen to LPG makes it an excellent substitute for hydrocarbon fuels since it provides a stable flame and a large explosive area.