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There is a good flow structure with good swirling flow before combustion that makes fuel more suitable for starting combustion.
The two strategies can be used together to achieve non-sooting combustion.
These regime maps can be used to understand the combustion modes at play in turbulent sequential combustors, as shown with 3-D large eddy simulations (LES) with semi-detailed chemistry.
Also the representation of the combustion trajectory in 3D space corresponding to equivalence ratio, flame temperature, and oxygen fraction provides new insight into optimal combustion management.
The combustion model shows potential to be used for MILD combustion regime and confirms its capability to be extended to multi-stream mixing cases.
The results reveal three different regimes of combustion.
Book ChapterDOI
01 Jan 2018
10 Citations
The knowledge obtained reveals the fundamentals and special features of oxy-fuel combustion and functions as a foundation for deeper exploration of oxy-fuel combustion.
It is established that the 2D approach to solving combustion problems leads to significant deviations of the obtained results from real ones and can be used only for a preliminary evaluation of the characteristics of the combustion process.
The simulations provide insights to some experimental observations usually associated with MILD combustion.
As such, this formulation represents a general description for the selection of combustion models, thereby overcoming potential limitations of flame-topology indicators and regime-specific combustion models.

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Is sliced coconut husk can be used in gasifiers?
5 answers
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What is smoke point?
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The smoke point is a critical parameter in combustion studies, representing the fuel flow rate where soot production is balanced by oxidation. It serves as a measure of flammability, with the smoke point of a material indicating its propensity to release thermal radiation and incomplete combustion products. Various factors influence the smoke point, such as pressure, diluent type, and dilution level, affecting the sensitivity of soot production to changes in oxidation rates. Methods for measuring smoke points exist for gaseous and liquid fuels, but not for solid fuels. Experimental studies have been conducted on the smoke point of acetylene flames, showing variations in flame height, fuel flow rate, and residence time with pressure changes. Smoke point measurements are crucial for understanding combustion characteristics and safety considerations in various applications.
What is smoke point in vegetable oils?
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The smoke point in vegetable oils refers to the temperature at which the oil begins to decompose, leading to the formation of possibly toxic compounds. This decomposition occurs due to the breakdown of triglycerides in the oil when exposed to high temperatures. The smoke point is a critical parameter as it indicates the threshold at which the oil's chemical structure starts to change, impacting its flavor, nutritional value, and safety. Vegetable oils are commonly used in various applications, and understanding their smoke points is essential for determining their suitability for different cooking methods. Specialized devices have been developed to accurately measure the smoke point of edible oils, ensuring precise and rapid detection.
What is cold point in canning and what are the factors affecting cold point?
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The cold point in canning refers to the location within the canned food where the lowest temperature is reached during the heating process. Factors affecting the cold point include the installation of equipment, operational procedures, and the reliability of testing facilities. Additionally, the accurate estimation of heat fluxes plays a crucial role in determining the cold spot location for conduction heated canned foods, ensuring the safety of the product based on precise thermal process lethality calculations. In the context of lamp tube processing, cold point equipment utilizes mechanisms like heating spark plugs and air cylinders controlled by a system to manage the temperature and pressure within the tube, enhancing production efficiency and product quality. Properly identifying and addressing the cold point is essential for maintaining food safety and quality in canned and processed products.
How does the combustion of different percentage of ethanol gasoline blends affect fuel efficiency?
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The combustion of different percentages of ethanol-gasoline blends significantly impacts fuel efficiency. Research on ethanol-diesel blends showed that increasing ethanol content led to decreased thermal efficiency, increased fuel consumption, ignition delay, and combustion duration, along with reduced in-cylinder pressure and heat release rate. Conversely, blending unleaded fuel with ethanol improved engine efficiency, enhancing brake power, torque, thermal efficiencies, and reducing brake specific fuel consumption. Among various proportions tested, the E20 blend demonstrated the best performance in terms of brake power. Additionally, ethanol-diesel blends altered combustion and emission characteristics, with increased cylinder pressure and temperature, improved thermal efficiency, reduced CO and soot emissions, but decreased power and increased fuel consumption.
What is pure diesel?
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Pure diesel refers to diesel fuel that has undergone specific processes or is made from particular raw materials to enhance its quality or properties. This can include the use of pure oxygen in diesel engines to improve combustion efficiency and reduce emissions, the production of ultra-pure diesel fuels with improved stability and reduced corrosiveness through the addition of special substances, and the creation of pure biodiesel from raw materials like Hodgsonia macrocarpa oil, which meets national standards for technical performance and environmental friendliness. Additionally, the invention of a pure alcohol-based diesel oil additive allows for the efficient and clean production of alcohol-based diesel oil with enhanced combustion, cleanliness, and safety features.
What is the PM10 emission fraction from chimneys that operate with carbon?
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The PM10 emission fraction from chimneys operating with carbon can vary based on the combustion conditions and the type of carbonaceous material burned. Studies have shown that emissions from combustion of different carbon sources like biomass and coal contain varying amounts of PM10. For instance, emissions from the combustion of biomass such as palm fiber and rice stubble showed high organic carbon (OC) content, which is a major component of PM10. Additionally, carbonaceous particles like elemental carbon (EC) and char are significant contributors to PM10 emissions, with ratios of OC/EC exceeding 2.0 in industrial cities like Huangshi. Therefore, the PM10 emission fraction from chimneys operating with carbon can be influenced by the specific carbon source and combustion conditions, highlighting the importance of source identification and emission control measures.
What is meant by micro combustion?
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Micro combustion refers to the process of burning fuel on a very small scale, typically in micro burners or reactors. This technology aims to improve combustion performance by enhancing combustion stability, efficiency, and temperature distribution. Micro combustion systems consume small amounts of fuel, making them efficient alternatives to conventional testing methods. By mixing fuel and air at the smallest scale possible, micro combustion can achieve low NOx emissions comparable to premixed combustion while minimizing risks like autoignition and flashback. The use of microscale combustion reactors allows for the testing and differentiation of fuels based on their characteristics, such as octane number and ignition/extinction temperatures. Overall, micro combustion technology plays a crucial role in enhancing combustion performance, stability, and efficiency in various applications.
How is the effect of energy hitting carbon dioxide different from energy hitting sulfur dioxide?
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When energy interacts with carbon dioxide (CO2) and sulfur dioxide (SO2), distinct outcomes are observed. Research indicates that the dissociative processes involving the loss of CO2 from carbon-centered radicals are typically exothermic, while the loss of SO2 from similar radicals tends to be endothermic. However, factors like increased entropy and stereoelectronic effects can make the C-S scission thermodynamically favorable under specific conditions, influenced by structural nuances and the degree of fluorination in the radical precursor. This difference in the energetics of CO2 and SO2 dissociation highlights the intricate reactivity variations between these two molecules when subjected to energy, shedding light on their distinct behaviors in chemical processes.
How do exhaust gas analysis devices contribute to reducing emissions and improving fuel efficiency?
4 answers
Exhaust gas analysis devices play a crucial role in reducing emissions and enhancing fuel efficiency. By accurately measuring components in exhaust gases, these devices enable the correction of measured values for better analysis. They help in identifying viscous components in exhaust gases, allowing for precise adjustments in measured values based on these concentrations. Additionally, exhaust gas processing apparatus utilizing high-energy thermal plasma and high-temperature chambers can efficiently decompose harmful gases like perfluorinated compounds, contributing to emission reduction and efficient exhaust gas treatment. Overall, these devices and systems aid in optimizing combustion efficiency in internal combustion engines, leading to reduced emissions, improved fuel efficiency, and a more environmentally friendly transportation sector.
Is thermal gravimrtric analysis can be done on already burnt brciks ?
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Thermal gravimetric analysis (TGA) can be conducted on already burnt bricks to understand their composition and behavior. TGA involves heating a sample at a controlled rate to measure weight changes with temperature, providing insights into the material's characteristics. In the case of charred documents, TGA helps classify them based on stages like dehydrated, tarred, charred, and ashed, aiding in deciphering the writing on them. Additionally, TGA has been used to analyze the combustion characteristics of Refused Derived Fuels (RDF) like MSW char briquettes, showing that the burning profiles are influenced by various processing parameters. TGA can also be a valuable tool in developing analytical methods for assessing the composition and quality of feedstock used in pyro-gasification technologies, offering a cost-effective approach for real-time monitoring.