text: finely 
  atomized, evenly distributed spray of 
  fuel 
  through a wide range of flow rates. Very 
  specialized design is necessary to provide a 
  nozzle with 
  suitable characteristics. The 
  spray parrern and circulation in the combustion 
  chamber must make efficient use of the fuel by 
  complete combustion. The temperatures in 
  the combustion nucleus can exceed 1,700” to 
  1,SW’ C but the secondary air will dilute the 
  gas and reduce the temperature to some value 
  which can be tolerated in the turbine section. 
  A pressure drop will occur through the com- 
  bustion chamber to accelerate the combustion 
  gas rearward. 
  turbulence and 
  In addition, 
  fluid friction will cause a pressure drop but this 
  loss must be held to the minimum incurred by 
  providing complete combustion. Heat trans- 
  ferred through 
  the walls of the combustion 
  chamber constitutes a loss of thermal energy 
  and should be held to a minimum. Thus, the 
  combustion chamber should enclose the com- 
  bustion space with a minimum of surface area 
  losses. Hence, 
  to minimize heat and friction 
  the “annular” 
  typ: combustion chamber offers 
  certain advantages over the multiple 
  type combustion chamber. 