By H.R.N. Jones
The global use of gasoline as a gasoline has elevated dramatically because the past due Sixties. in lots of international locations, this has been essentially end result of the improvement of traditional gasoline assets as a substitute for the older and, in lots of instances, declining synthetic fuel industries. this article bargains with the $64000 advancements in burner layout, with no which neither the outstanding good fortune of conversion to normal fuel, nor the newer superior efficiencies, might have been accomplished. it's geared toward either the scholar and the certified engineer. After a gap bankruptcy, which supplies proper definitions and a few easy combustion chemistry, layout facets of the 3 most typically encountered forms of burner (non-aerated, in part aerated and entirely aerated) are mentioned intimately, including a few more odd burner structures. ultimately, the final chapters examine the applying of those layout points to varied household home equipment, and designated emphasis is given to protection, ease of equipment operation and techniques of holding excessive potency.
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Additional info for Application of Combustion Principles to Domestic Gas Burner Design
66. 3 has derived a number of equations which relate optimum area ratios to primary aeration, gas properties and the loss coefficients c d p and C L . In this section, the loss coefficients are discussed with particular reference to the design of the throat and mixing tube, and recommendations are made for minimizing friction losses within the burner. 85 can be expected. For flame ports, where the pressures and velocities are much lower, flow is usually laminar, and the discharge coefficient is relatively low.
As gas flow rate increases and flame thickness decreases (Stages 2 and 3), the flame forms at a more central and, due to the orifice shape, a lower position. Mixing occurs here by entrainment at the flame base as well as diffusion, so that stability is achieved by a balance between gas flow rate and mixture burning velocity. The entrained air flows parallel to the jet structure, such that at Stage 3, a counter-current gas/air flow is set up which ensures good mixing and excellent flame stability.
15. 35. 1 Diffuser frictional loss coefficient as a function of angle of taper. 7 The variation in primary aeration with length of the mixing tube. (From Prigg 40 after Berry et al. ) Although authors have identified two separate loss coefficients, it should be remembered that the two are interdependent. The longer the parallel throat, the flatter the velocity profile at the entry to the diffuser so that losses in the diffuser will be low. If a short throat is used, pressure losses can be very high in the diffuser unless a long shallow taper is used.