Flame length and flame height

[VIGNESHWARAN NARAYANAN PhD]

Hello, 

Is there any easy way to measure flame length and flame height of a compartment fire? 

Can you please let me know?

Its excruciatingly time consuming process using smokeview 

Regards 

Vignesh 

[ashutos...@gmail.com]

Flame height is obtained as the extension till where the heat release rate is 99% of the total heat release rate of the fire. For doing that, HRRPUL, when integrated till the flame height should equal 99% of the total HRR. I have seen this being told in response to one of the earlier queries. Let us wait for other comments from learned members of FDS community.

[VIGNESHWARAN NARAYANAN PhD]

Thanks Ashutosh,

But my query is, How can we obtain flame height from FDS. Do we have a device that can do the purpose?. 

Have a good day

Thanks & Regards

Vigneshwaran Narayanan

Fire Researcher

+27797162451

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[ASHUTOSH BHARTI]

Yes. Place devices named "HRRPUL" along the flame extension.

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[VIGNESHWARAN NARAYANAN PhD]

Thanks, But I believe to add this device one must be aware of flame length. In my case, I am not sure. How about using HRRPUV (as I know where to expect flames) and then use 99% fraction to determine flame effectiveness?

Have a good day

Thanks & Regards

Vigneshwaran Narayanan 

Fire Researcher

+27797162451

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[ASHUTOSH BHARTI]

The flame length need not be known in advance. You can get HRRPUL at any number of points along the flame. Just try using DEVC XB=...,...,...,...,...,..., QUANTITY='HRRPUL', POINTS=...

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[VIGNESHWARAN NARAYANAN PhD]

Thanks. I also happen to find another method where HRRPUV was mentioned with 95%-97% of HRR is considered as Flame lengths

Have a good day

Thanks & Regards

Vigneshwaran Narayanan PhD

Fire Researcher

+27797162451

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