Pages

Saturday, December 31, 2011

AIRFLOW CONTROL - A hydraulically operated bleed valve and inlet guide vane airflow control system.

Fig. 3-15 Typical variable stator vanes.
AIRFLOW CONTROL
30. Where high pressure ratios on a single shaft are required it becomes necessary to introduce airflow control into the compressor design. This may take the form of variable inlet guide vanes for the first stage plus a number of stages incorporating variable stator vanes for the succeeding stages as the shaft pressure ratio is increased (fig. 3-15). As the compressor speed is reduced from its design value these static vanes are progressively closed in order to maintain an acceptable air angle value onto the following rotor blades. Additionally interstage bleed may be provided but its use in design is now usually limited to the provision of extra margin while the engine is being accelerated, because use at steady operating conditions is inefficient and wasteful of fuel. Three types of air bleed systems are illustrated as follows: fig. 3-16 hydraulic, fig. 3-17 pneumatic and fig. 3-18 electronic.
MATERIALS
31. Materials are chosen to achieve the most cost effective design for the components in question, in practice for aero engine design this need is usually best satisfied by the lightest design that technology allows for the given loads and temperatures prevailing.


Fig. 3-16 A hydraulically operated bleed valve and inlet guide vane airflow control system.

Fig. 3-17 A pneumatically operated bleed valve system.

1 comment:

  1. I together with my buddies appeared to be studying the excellent advice located on the blog and so unexpectedly I had a horrible suspicion I had not expressed respect to the site owner for those techniques. These boys had been as a result joyful to learn them and now have in actuality been taking advantage of those things. Appreciate your getting considerably considerate as well as for deciding upon variety of smart subjects millions of individuals are really desperate to discover. My personal sincere regret for not saying thanks to you sooner. zehnder charleston radiator

    ReplyDelete