Hi may be you can use
a material with a transmit 1 pigment, an interior and a media emitting or
scattering for the flame.
don't forget to declare your object a hollow otherwise media don't work
I used that for a candle flame with a light in the flame


#declare flame=    material  // flamme_1
   {
      texture
      {
         pigment
         {
            color rgbt <1.0, 1.0, 1.0, 1.0>
         }
         finish
         {
            ambient 0.0
            diffuse 0.0
            phong 0.            specular 0.
         }
      }
      interior
      {
         media
         {
            scattering
            {
               1 ,  rgb <0.604167, 0.208333, 1.0> // isotropic scattering
            }
            density
            {
               spherical
               scale  1.5
            }
         }
         media
         {
            scattering
            {
               1 ,  rgb <0.5, 0.3125, 0.0> // isotropic scattering
            }
         }
      }
   }

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