damp gap

English to French Tech/Engineering Patents LEAN BURN COMBUSTOR WITH IMPROVED PRE-DIFFUSER GEOMETRY

The pre-diffuser is generally annular and includes radially inner and radially outer walls defining an outlet for the compressed air. A damp gap (g) is defined as axial distance between a mid-point between the radially inner and radially outer walls of the pre-diffuser at said outlet and a mid-point between the radially inner and radially outer annular walls of the combustor chamber at the meter panel, wherein a ratio g/d of the damp gap to the lean burn fuel injector head tip diameter is less than 1.30.

The pre-diffuser 90 is arranged upstream of the lean burn fuel injector head 54 at a distance g (damp gap) from the meter panel 68. The damp gap g is defined as axial distance between the outlet pre-diffuser mid-point 98 and the meter panel mid-point 69. The pre-diffuser 90 is distanced from the combustor chamber 60 such that the ratio g/d of the damp gap g to the lean burn fuel injector head tip diameter d is less than 1.30, for example less than 1.15, and greater than 0.65, for example greater than 0.85. In an embodiment, the combustor chamber 60 may have a ratio g/d of 1.05.