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Additional resources for Application of Combustion Principles to Domestic Gas Burner Design

Example text

3 The effect of Reynolds number on the discharge coefficient from a typical injector orifice and flame ports. 9) are achieved 40 when the orifice length is about the same as the diameter and when the angle of approach is about 35°. 2. Effect of Reynolds number. The discharge coefficient is dependent on flow conditions in the orifice as expressed in terms of the Reynolds number (Re)*. 3 shows that for a typical orifice with laminar flow (Re < 2000), c d is strongly dependent on Re, whereas for turbulent flow, c d may be considered to be virtually constant.

The greatest static pressure behind the burner ports for a particular gas rate from a given injector. e. 14) g(1+R). 15) where σ is the relative density of the gas. 16) This equation relates the optimum injector/throat area ratio to properties of the gas and gas/air mixture. 4). Note that if there were no losses (c dp =1; C L =0), then the optimum conditions would correspond to A t=A p. e. R is known), there is some merit in expressing R in terms of area ratios. 21) both provide quadratic equations in R which can be solved.

The qualitative conclusions do, however, hold for multiport burners, although precise correlation can be complicated by the interactions of adjacent flames. The earliest generally accepted model of flame lift, due to Lewis and von Elbe 4 , invoked a stabilizing region within the preheat zone of the flame in terms of the velocity gradient in the boundary layer. 9 shows the effect of increasing the gas velocity. The flame will be stable at a distance y from the stream boundary where the stream velocity u matches the burning velocity S.

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