FAN SECTION<BR>The fan section is at the front of the engine and,<BR>downstream from the air inlet cowl, the section includes<BR>the fan and booster module and fan frame module.<BR>The purposes of the fan and booster are :<BR>- to accelerate air overboard to generate thrust.<BR>- to increase the pressure of the air directed to the<BR>High Pressure Compressor (HPC).<BR>After entering the air inlet cowl, the total engine airflow<BR>passes through the fan rotor, which increases the air’s<BR>kinetic energy.<BR>Most of the airflow is ducted overboard producing<BR>approximately 80 % of the total thrust. The remainder is<BR>directed through the booster, where it is pressurized<BR>before entering the HPC.
kinetic energy <BR>动能
fan section
FAN AND BOOSTER MODULE<BR>The Fan and Booster module consists of :<BR>- a spinner front cone<BR>- a spinner rear cone<BR>- a single stage fan rotor<BR>- a four stage axial booster<BR>The spinner front cone is designed to minimize ice buildup<BR>and is attached to the spinner rear cone.<BR>The spinner rear cone holds the blades axially in position<BR>of the fan disk.<BR>The fan disk supports the mid-span shrouded fan blades<BR>and a booster spool.<BR>The booster spool accommodates booster blade stages,<BR>numbers 2 thru 5.<BR>The booster vane assembly stages, numbers 1 thru 5,<BR>are stacked and mounted on the fan frame.
fan and booster design
FAN AND BOOSTER MODULE (CONTINUED)<BR>Spinner front cone<BR>Interference fit and single angular mounting positions are<BR>characteristics of the installation of the front and rear<BR>cone onto the fan disk.<BR>The spinner front cone has an offset hole on its rear<BR>flange, identified by an indent mark, to ensure correct<BR>alignment for installation onto the rear cone front flange.<BR>The rear flange has 6 mounting screw locations and 3<BR>threaded inserts, located every 120°, for installation of<BR>jackscrews used in removal procedures.
<P>interference fit </P>
<P>过盈</P>
<P>mounting screw <BR>安装螺钉</P>
<P>jackscrew</P>
<P>起重螺丝</P>
spinner front cone
FAN AND BOOSTER MODULE (CONTINUED)<BR>Spinner rear cone<BR>The front flange of the spinner rear cone has 6 line<BR>replaceable, crimped, self-locking nuts.<BR>The inner rear flange has 12 mounting screw holes, for<BR>installation onto the fan disk, and there are a further 6<BR>threaded holes for the installation of jackscrews used in<BR>rear cone removal procedures.<BR>Both front and rear flanges have an offset hole to ensure<BR>correct installation and they are identified by indent<BR>marks.<BR>The rear cone also has an integrated air seal that is<BR>glued to its inner rear flange.
rear cone
