Combustion Sustained: Starter Motor Torque/Inertia Selection

  • Thread starter Bonavaero
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In summary, the conversation discusses the selection of a starter motor for a gas turbine. It is questioned whether the minimum torque or inertia needed for the starter motor should overcome that of the compressor, the turbine, or both. The role of the gearbox in starting the engine is also mentioned. It is concluded that the starter motor is primarily for the compressor, as it must be spun to start the engine and create the necessary air pressure for combustion. Once the process becomes self-sustaining, the movement of the turbine will cause the compressor to move as well.
  • #1
Bonavaero
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In selecting starter motor for a gas turbine, which minimum torque or inertia is it supposed to overcome, it that of the compressor or the turbine, or both.
 
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  • #2
I would assume it would be the turbine. The gearbox would play an important role in getting the engine started.
 
  • #3
If you're spinning the shaft to start it, then you'll obviously need something to spin the shaft...the whole thing. In addition to that, the blades will be moving air, so that will increase the torque required.
 
  • #4
I would assume once the shaft is spinning at a moderate speed and the gas is let out to the combustor, the process becomes self sustaining?
 
  • #5
Oh yea. Jet engines are super easy to design. You'll be adding a high-pressure spool in a month.

edit: I should add this post may contain extreme levels of sarcasm.
 
  • #6
I assume starter motor are predominantly for compressors (even though turbine is attached from a coomon shaft) ; because after combustion start turbine start to move & carryout combustion one must move compressor such that air is sucked & compressed to combustor. However once process is self-sustained its the opposite; turbine movement causes compressor to move!
 

1. What is combustion sustained and how does it relate to starter motor torque?

Combustion sustained refers to the process of maintaining a continuous and stable combustion reaction within an engine. This is crucial for the engine to function properly. The starter motor torque is the force generated by the starter motor to rotate the engine's crankshaft and initiate the combustion process. Therefore, selecting the appropriate starter motor torque is essential for ensuring successful combustion sustained.

2. What is the significance of inertia selection in combustion sustained?

Inertia selection refers to the selection of an appropriate moment of inertia for the starter motor, which determines its ability to overcome the resistance of the engine and rotate the crankshaft. This is crucial for achieving successful combustion sustained as it affects the speed and efficiency of the starter motor in initiating the combustion process.

3. How is starter motor torque and inertia selection determined?

Starter motor torque and inertia selection are determined by various factors such as the type and size of the engine, the fuel used, and the desired speed and efficiency of the engine. This requires careful analysis and calculations by engineers and scientists to select the most suitable torque and inertia for the specific engine.

4. What are the risks of selecting incorrect starter motor torque and inertia for combustion sustained?

If the starter motor torque is too low, it may not be able to rotate the crankshaft and initiate the combustion process, leading to engine failure. On the other hand, if the torque is too high, it can cause damage to the engine components. Similarly, incorrect inertia selection can result in inefficient combustion and potential damage to the engine.

5. How can the appropriate starter motor torque and inertia be maintained for long-term combustion sustained?

Maintaining the appropriate starter motor torque and inertia for long-term combustion sustained requires regular maintenance and monitoring of the engine. Any changes in the engine's performance should be promptly addressed to ensure that the torque and inertia remain at optimal levels. Additionally, using high-quality and properly sized starter motors can also help in maintaining long-term combustion sustained.

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