What is the largest SMD value that is required to sustain combustion.

In summary, when using kerosene as a fuel in a gas turbine engine, the largest SMD that the atomizers have to provide for engine start-up and to sustain combustion depends on various factors such as droplet size, ignition energy, and injection velocity. Increasing the droplet size may require a higher ignition energy and longer ignition time, while premixing with a fuel lean mixture may also require more ignition energy. If using an existing setup with an atomizer producing large droplets, increasing the ignition energy may be necessary. Additionally, a 10% increase in SMD could result in a need for 3-4 times higher ignition energy in an already functioning setup.
  • #1
sgvaibhav
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Using kerosene as a fuel in a gas turbine engine.
What can be the largest SMD that the atomizers HAVE to provide for engine start-up and to sustain combustion?

SMD : Sauter Mean Diameter or also known as D32 in drop size distributions model.
 
Last edited:
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  • #2
This is a difficult question to answer. Some guidelines: if your droplets are larger, you need a higher ignition energy. Also, you might need to adjust the ignition time, which should be probably longer.
The effective ignition energy depends on the droplet injection velocity, so the atomizer pressure. When there's premixing, a fuel lean mixture will need more ignition energy.

So, if you have an existing setup with an atomizer producing too large droplets, then increase the ignition energy. For an existing and working setup, if you increase the SMD by 10% you'll easily need 3-4 times higher ignition energy.
 

Related to What is the largest SMD value that is required to sustain combustion.

1. What is an SMD value?

An SMD value, or Specific Minimum Density, is a measure of the minimum amount of energy required to ignite and sustain combustion in a material.

2. How is the SMD value determined?

The SMD value is determined through laboratory testing using standardized methods, such as the ASTM E 136 test. This involves subjecting the material to a controlled heat source and measuring the time it takes for the material to ignite and sustain combustion.

3. What factors affect the SMD value?

The SMD value can be affected by a variety of factors, including the chemical composition of the material, its physical properties, and the environmental conditions (such as temperature and humidity) in which it is tested.

4. What is the significance of the SMD value in fire safety?

The SMD value is an important factor in determining the potential fire hazard of a material. Materials with lower SMD values are more likely to ignite and sustain combustion, making them more hazardous in fire situations.

5. What is the largest SMD value that is required to sustain combustion?

The largest SMD value required to sustain combustion varies depending on the specific material being tested. However, in general, a higher SMD value indicates a lower risk of combustion, so the largest possible SMD value is desirable for fire safety purposes.

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