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Questions and Answers
What is another term for combustion?
What type of combustion can lead to high NOx emissions?
What is a combustion wave?
In premixed combustion, where are the fuel and oxidizer mixed?
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Which of the following steps is NOT part of the combustion reaction process?
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What happens when fresh fuel and oxidizer react in a combustion wave?
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Premixed combustion involves mixing ______ and oxygen before burning
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Nonpremixed combustion, also known as diffusion flames, involve mixing fuel and oxygen ______
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Partial combustion can result in leaving ______ residue which can cause pollution
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The combustion reaction involves an ______ step where fuel breaks down into smaller components
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Combustion reactions often produce carbon dioxide and ______ vapor
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An endothermic step: After breaking down, the resulting products combine again to form carbon dioxide and produce energy which helps maintain the temperature required for further reactions. Combustion is a process that releases ___________.
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A normal gas flame can reach up to 982°F (527°C), although blue flames from natural gas can go even higher. The ___________ of a flame affects its behavior.
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Different gases emit different colors depending on their composition and temperature. Gases emitting yellow and red tend to be hotter than those producing less intense colors. Flame ___________ can indicate the temperature of the flame.
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When the combustion process doesn't consume all available oxygen, it leaves behind partially burned fuel particles, known as soot or smoke. This is an example of ___________ combustion.
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The rate at which fuel ignites varies significantly between different fuels. For instance, the flaming speed of liquid propane is much faster than that of ___________.
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Study Notes
Combustion is a chemical process where a substance reacts with oxygen from the air to produce heat and light. It's also known as burning or ignition, depending on how it occurs. There are several types of combustion, which vary based on the rate of reaction, temperature, and pressure conditions.
One type of combustion is called premixed combustion, where fuel and oxidizer (usually air) are mixed together before they enter the combustor. This results in a uniform mixture throughout the combustor, allowing for efficient energy transfer. Another type is non-premixed combustion, where the fuel and oxidizer mix inside the combustor, leading to complex flow patterns. Non-premixed combustion can lead to high NOx emissions, so it's typically used in low-power applications.
Another aspect of combustion is the combustion wave. A combustion wave is a region within a mixture that has been transformed into products by reactions between fuel and oxidizer molecules. As the wave moves through the mixture, fresh fuel and oxidizer react until all of them have been consumed. This creates the flame, which we see when something burns.
The combustion reaction itself involves three main steps: heating, mixing, and burning. First, the fuel and oxidizer must be heated enough to react. Next, the two chemicals need to mix well together. Finally, once they meet, they undergo a fast exothermic reaction, releasing heat and light, which we perceive as fire.
In summary, combustion is a process where a substance reacts with oxygen from the air to produce heat and light. It comes in different forms such as premixed and non-premixed combustion, both involving different flow patterns and efficiency levels. The combustion wave is the moving region where fuel and oxidizer transform into products, creating the visible flame.
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Description
Explore the different types of combustion processes such as premixed and non-premixed combustion, along with the concept of combustion waves. Learn about the heating, mixing, and burning steps involved in combustion reactions.
