Get Application of Combustion Principles to Domestic Gas Burner PDF
By H.R.N. Jones
The global use of gasoline as a gasoline has elevated dramatically because the past due Nineteen Sixties. in lots of international locations, this has been basically a result of improvement of common fuel assets as an alternative for the older and, in lots of circumstances, declining synthetic gasoline industries. this article offers with the $64000 advancements in burner layout, with out which neither the striking luck of conversion to average fuel, nor the more moderen more advantageous efficiencies, might have been accomplished. it truly is geared toward either the coed and the certified engineer. After a gap bankruptcy, which supplies correct definitions and a few easy combustion chemistry, layout features of the 3 most typically encountered kinds of burner (non-aerated, partly aerated and completely aerated) are mentioned intimately, including a few more odd burner structures. eventually, the final chapters contemplate the applying of those layout facets to numerous family home equipment, and specified emphasis is given to protection, ease of equipment operation and strategies of retaining excessive potency.
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Additional resources for Application of Combustion Principles to Domestic Gas Burner Design
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.
Application of Combustion Principles to Domestic Gas Burner Design by H.R.N. Jones