Design of atmospheric gas burners. . f good orifices,injecting tubes, etc., has been lost by restricting the free flow of airinto the injector. This is equally true for industrial appliances,but as these are usually designed more nearly for the existing con-ditions, it is not necessary to make so much allowance in design forvarying conditions as in the case of domestic burners. 58 Technologic Papers of the Bureau of Standards 1. AREA OF AIR-SHUTTER OPENING REQUIRED The maximum rate at which a burner is to be operated must beknown. It is also necessary to know what the minimum size ofair-shutte
Design of atmospheric gas burners. . f good orifices,injecting tubes, etc., has been lost by restricting the free flow of airinto the injector. This is equally true for industrial appliances,but as these are usually designed more nearly for the existing con-ditions, it is not necessary to make so much allowance in design forvarying conditions as in the case of domestic burners. 58 Technologic Papers of the Bureau of Standards 1. AREA OF AIR-SHUTTER OPENING REQUIRED The maximum rate at which a burner is to be operated must beknown. It is also necessary to know what the minimum size ofair-shutter opening should be in order to get the required volumeof air into the burner. To form some opinion of the area of air-shutter opening required, a burner was operated with the airshutter in a position where it offered no resistance to the flow ofair, and the total volume of air injected was determined. By k*° \ \ § \ \ \ ftN it X \ \ \ \ *??» s N *J *§ S o &0 o.+ 20 2.+ 32 36 *0 Primary Air Opening(). $£ o /o so 30 40 so tio ro so go topPer Cent Loss of Air Inj&cf/on Fig. 29.—Velocity of air through shutter with different areas of shutter opening andrelation of air injection to velocity of air through shutter gradually closing the air inlet and observing the effect of the airinjection the values shown in Table 12 were obtained. These values have been plotted in the curves of Fig. 29, and showthe loss of injecting power with the decrease of the area of air inletfor the particular conditions stated in Table 12. No attempt todraw any definite conclusions from these curves is made, sincethere are a number of things to be taken into consideration. Theair injection will vary with the momentum of the gas stream, thesize of the burner, the design of the injector, and the area of the Design of Atmospheric Gas Burners 59 air-shutter opening. In general, one might say that to keep theloss of air injection down to i or 2 per cent, it is necessary to havethe shut
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