JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
On the Characteristics of the Turbulent Diffusion Flames
(In Case of Using Town Gas as Fuel)
Seiya MukoharaOsami Nishida
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1977 Volume 12 Issue 4 Pages 300-305

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Abstract

As a combustion system in ships, turbulent diffusion flames are widely used. Yet such a combustion system involves various problems to be solved. One of them is that some ill effects are caused by the lowered quality of fuels, and another is how to burn such a fuel as is mixed with various noncombustible ingredients such as waste oil.
We, therefore, in order to make basic explications about these problems above, made various experiments, using town gas as fuel, under the condition that overall equivalence ratio (φ) is less than the stoichiometric equivalence ratio.
To sum up the results of our experiments, the most important points are as follows:
(1) The temperature of the flame reaches its maximum value in the central regions 5cm-25cm from the nozzle tip, while it lowers as the distance from the nozzle tip becomes greater.
(2) In regard to the gas analysing results of the axial distance, CO, H2 and unburnt hydrocarbon reach their peak value in the neighbourhood of the nozzle, but they become less in the rear-flow, and the combustion efficiency increases at the same time.
(3) Because the overall equivalence ratio is made by changing the quantity of the combustion air, the diffusible width of flame is affected nice distinction to be entrainment of air transfer across the flame surface.
It can be said that the experimental flames used in our experiments are not the pure diffusion flames, because we used town gas containing about 3.5 per cent oxygen.

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