The draught produced by a steam jet issuing from a nozzle placed in th...
In steam jet draught, draught is produced by a steam jet issuing from a nozzle placed in the chimney. Steam jet draught was used in locomotive boilers.
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The draught produced by a steam jet issuing from a nozzle placed in th...
The correct answer is option 'A', steam jet draught.
Explanation:
A draught is defined as the flow of air or gas through a chimney or flue. It is used to create a pressure difference that encourages the flow of air or gas in a specific direction. In the case of a steam jet draught, the draught is produced by a steam jet issuing from a nozzle placed in the chimney.
Let's understand the process of steam jet draught in more detail:
1. Steam Jet: The steam jet is generated by passing high-pressure steam through a specially designed nozzle. The nozzle is designed to convert the pressure energy of the steam into kinetic energy, creating a high-velocity steam jet.
2. Nozzle Placement: The nozzle is placed in the chimney or flue of a boiler or furnace. The location of the nozzle is crucial as it determines the direction and intensity of the draught.
3. Chimney: The chimney is a vertical structure that provides a passage for the exhaust gases or flue gases to escape into the atmosphere. It also creates a natural updraft due to the temperature difference between the inside and outside air.
4. Steam Jet Interaction: When the high-velocity steam jet is released from the nozzle into the chimney, it interacts with the surrounding air and gases. The high-speed steam jet creates a low-pressure region, causing the air and gases inside the chimney to be drawn towards the nozzle.
5. Air and Gas Flow: The air and gases inside the chimney are drawn towards the nozzle by the low-pressure region created by the steam jet. This creates a flow of air and gases through the chimney, facilitating the removal of exhaust gases from the boiler or furnace.
6. Advantages: The steam jet draught has several advantages. It can increase the efficiency of combustion by providing a constant supply of fresh air to the boiler or furnace. It can also enhance the removal of exhaust gases, reducing pollution. Additionally, it can provide better control over the draught conditions, allowing for improved combustion and heat transfer.
In conclusion, the draught produced by a steam jet issuing from a nozzle placed in the chimney is called a steam jet draught. It utilizes the high-velocity steam jet to create a low-pressure region, which draws air and gases through the chimney, facilitating the removal of exhaust gases and enhancing combustion efficiency.
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