A novel high temperature 1H NMR imaging probe for combustion studies: the behaviour of both a lit and unlit methane gas jet.
The design of a NMR probe suitable for very high temperature samples is described. The loop gap resonator is water cooled and tuned to 100 MHz for use in a 2.4 T horizontal bore magnet. The probe has been specifically designed for imaging of the combustion process. An experiment is described in this paper which shows the behaviour of a methane gas jet when both lit and unlit. The jet of gas may be observed in its unlit state flowing at up to 2 ms(-1) from a 1 mm diameter orifice using a Single Point Imaging technique. Images of the lit gas show loss of nuclear polarisation within 3 mm of the orifice. A residual amount of un-decomposed gas is visible in the first few millimetres of the flame neck. A computational fluid dynamics model is used to verify the distribution of molecular methane, as well as the temperature of the flame.
Physics Department, University of New Brunswick, NB, Canada E3B 5A3. paul.glover@nottingham.ac.uk
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PM
Glover
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Newling
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Poirier
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Balcom