Effects of Fluid Flow Characteristics and Heat Transfer of Integrated Impingement Cooling Structure for Micro Gas Turbine

Salleh, Hamidon; Khalid, Amir; Sulaiman, Syabillah; Manshoor, Bukhari; Zaman, Izzuddin; Amirnordin, Shahrin Hisham; Asyraf, Amirul; Razzaly, Wahid

doi:10.37934/cfdl.12.9.104115

Cited by 9 publications

(9 citation statements)

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“…The Reynolds number (Re) is used to determine the distribution and value of the heat transfer coefficient [18]. By calculating the density of heptane, pipe diameter, and reactant flow velocity with air viscosity, the Reynolds Number can be obtained as shown in Eq.…”

Section: Calculation Of Reynolds Number (Re)mentioning

confidence: 99%

The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors

Evita Leninda Fahriza Ayuni,

Andinusa Rahmandhika,

Daryono

et al. 2024

ARFMTS

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Micropower generator is a micro-scale energy source that has two main components, namely a micro/mesoscale combustor and thermophotovoltaics (TPV). The micro-scale combustor is one part that functions as a combustion chamber that produces heat in micropower plants. Heptane is used as fuel, while the combustor combustion chamber with a diameter of 3.5 mm is made from duraluminium-quart glass tube. Combustion stability in the combustion chamber is influenced by several factors, such as temperature, geometry, and combustion chamber design. In order to maintain flame stability, mesh is added to the combustion chamber. One way to minimize heat loss in the combustion chamber is to add an insulating layer to the combustion chamber. This research aims to prove the role of adding an insulating layer in flame stability in mesoscale burners. It is necessary to add an appropriate insulating layer to minimize heat loss so that it remains stable in the mesoscale burner. This experimental test shows that the temperature distribution when adding an insulation layer with a thickness of 3 mm has a higher temperature on the outside compared to a thickness of 6 mm. Meanwhile, the temperature inside the combustor chamber with a thickness of 6 mm is superior to that with a thickness of 3 mm. The flame limit of the combustor with a mesh distance of 5 mm for liquid heptane fuel was successfully stable at an equivalent ratio of ɸ0.97 – 1.5 with a maximum speed of 31.7.

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Section: Calculation Of Reynolds Number (Re)mentioning

confidence: 99%

The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors

Evita Leninda Fahriza Ayuni,

Andinusa Rahmandhika,

Daryono

et al. 2024

ARFMTS

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“…The heat convection across the cylinder wall is the dominant mode of heat dissipation in the MFPG system [17,44,45]. Therefore, in order to simplify the model and accelerate the calculation, the composition inhomogeneity and temperature gradient inside the combustion cylinder can be reasonably neglected [33,34].…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…Heat loss is another major factor leading to inefficiency or flame extinction of microengines [44][45][46]. As the engine dimension shrinks, the area-to-volume ratio increases, resulting in greater heat transfer loss per unit volume.…”

Section: Introductionmentioning

confidence: 99%

Parametric Simulations on Leakage and Performance of a Miniature Free-Piston Generator (MFPG)

Zhang

Liu

et al. 2021

Applied Sciences

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The miniaturization of electrical equipment and popularization of portable devices is an appealing motivation for the development of small-scale heat engines. However, the in-cylinder charge leaks severely as the engine dimension shrinks. The free-piston engine on a small scale provides better sealing than other miniature heat engines. Therefore, a miniature free-piston generator (MFPG) with a single-piston internal combustion engine (ICE) and a voice coil motor (VCM) was proposed in this work. A dynamic model with special attention on the heat transfer and leakage was established accordingly, upon which parametric studies of leakage and its effects on the performance of the MFPG system were performed. Four key parameters, including scavenging pressure, ignition position, combustion duration and piston mass, were considered in the model. The results showed that the mass leakage during the compression decreases with the rise of the motoring current. The indicated thermal efficiency can be improved by boosting scavenging pressure and increase motoring current. The critical ignition position is 2 mm before the top dead center. When ignition occurs later than that, the MFPG system is incapable of outputting power. The chemical to electric energy conversion efficiency is about 5.13 %, with an output power of 10~13 W and power density around 4.7~5.7 W/cc.

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“…Large power plants placed on dams, including Haditha dam in Anbar province, have been affected by reduced production of generated energy due to the low water level within the Euphrates River, as well as thermal and gas power plants, which require high flows for the operation of cooling systems such as The Zweia station in Anbar province (This type of station (small-generation plants) which is the subject of our research is one of the most successful solutions that must be studied and developed in Iraq. There is a greater impetus towards the renewable energy sources to increase the global energy produced [3][4][5][6][7][8][9]. Hydropower was introduced to be an alternative solution, especially since 71% of the land is covered with water, this means that an inexpensive and environmentally friendly electrical energy can be generated, and this energy can expand rapidly [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Modelling of Small Hydropower Turbine

Abdullah

Kamel

Khalil

2021

ARFMTS

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Recently, Archimedes screw turbines have been developed to operate as small hydropower stations, because of its reliability to operate with the low head( less than 5 m) and its low cost of design and operation. In the present study, the influence of the flow rate, shaft inclination angle, and the number of blades is studied using physical model and numerical model to determine the performance of Archimedes screw turbine at Ramadi Barrages in Iraq. The physical model was made of stainless steel with the following parameters: (the radius ratio is 0.536, the pitch is 70 mm, the shaft angles are 30? ,35? ,40? ,45?). The experimental work on the physical model is achieved with different flow rates and angles .The results showing that the highest efficiency is 81.4 % At the angle of 35? and the flow rate is 1.12 l/s . The maximum energy obtained is 25.13 w at the angle of 45?, the e flow rate is 2.065 l/s, and the efficiency was 72%. Also the results show that the increase in the number of blades increases the torque and efficiency of the turbine.

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Effects of Fluid Flow Characteristics and Heat Transfer of Integrated Impingement Cooling Structure for Micro Gas Turbine

Cited by 9 publications

References 0 publications

The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors

The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors

Parametric Simulations on Leakage and Performance of a Miniature Free-Piston Generator (MFPG)

Numerical and Experimental Modelling of Small Hydropower Turbine

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