Radiation emitted in Gaseous Explosions. 83 



2G. These records also show that R* T varies with cylinder 

 ■dimensions in a similar way to that of K t (see § 13). For 

 purposes of rough calculation we may therefore write 



:R T = 0-00056 (0 max> - 700) \/~D \/ ~ 



= 0-0001 (tfnxax— 700) Vl^W (15) 



Summary. 



27. An attempt has been made in this paper to build up 

 formulae by means of which the emission of radiation during 

 explosion and subsequent cooling of inflammable mixtures 

 of coal-gas and air of various strengths in a cylindrical vessel 

 whose diameter is equal to its length and whose walls are 

 black may be estimated from the pressure time-curves for 

 these mixtures. An attempt has also been made to intro- 

 duce factors into these formulae so that the radiation may be 

 estimated roughly when the density is other than atmospheric, 

 and also when the explosive gaseous mixture is contained in 

 a cylindrical vessel of dimensions different from those of the 

 experimental vessel. 



The conditions governing the emission of radiation in 

 gaseous explosions are exceedingly complex and the formulae 

 set up can only be relied upon to give results correct to 

 within from 10 to 20 per cent. Nevertheless as no such 

 formulae have hitherto been set up their formulation it is 

 considered will serve a useful purpose in that they may be 

 used as a basis for gas-engine calculations. 



points only, and consequently the figures 480 and 190 may not be suffi- 

 ciently reliable to enable one to evaluate/(D) with an} r degree of accuracy. 

 In view of tbe fact that equation (14) gives results which are fairly well 

 in accord with values for R T found by experiment within the limits of 

 •density £ atmosphere and H atmospheres, it has been thought worth 

 while to include it in this paper. 



G2 



