e) Stage and airflow through a stage in axial flow compressor
A stage is a pair of rotating airfoil and stationary airfoil in an axial flow compressor. As the air passes through the rotating airfoil (also called a blade or rotor), its velocity increases. High velocity air then passes through the stationary airfoil (also known as the stator or just vanes) where it is retarded converting the kinetic energy due to velocity increase into static pressure.
f) Reasons for twisting axial flow compressor rotor blades
The rotor blades are usually twisted from the root to the tip, and therefore changing the angle of incidence of the airflow, in order to increase the pressure towards the tip of the blades. This also allows for control of pressure change along the blade.
g) Two methods of attaching rotor blades to a compressor drum
Compressor blades are usually fixed to the drum by use of mechanical feature referred to as roof fixing. The main objective here is to use the lightest fixing means possible so that the overall weight of the disc does not change much. There are two methods for fixing the blades onto the drum.
i) Axial fixing: This is whereby, on the disc, a series of slots are machined in order to fix the dovetail or fir-shaped rotor blades. This method is both complex and costly although it is also robust to handle foreign materials within the compressor. ii) Circumferential fixing: This method is relatively cheaper and simpler since it is easy to machine an annular groove
and long, thick pins are inserted lengthwise into the bone tissue. The pins are held in place by
Pivot – The rounded pointed surface of one bone articulates with a ring formed partly by another bone and partly by a ligament. This type of joint allows rotation only around its own longitudinal axis.
In all cases a fixed constraint was applied at either end of the D6 brace. The hydrophone is constrained within the surface of the hole (surface-to-surface contact) to allow for movement within the hole but disallowing penetration; the area of the hydrophone that was linked to the D6 brace via welding has been constrained to the surface of brace D6 (using surface-to-surface gluing). This gluing represents the welding between the hydrophone and the surface of brace D6.
This section start from joints 4 to 8. For joints 4,6,7,8, they are with the dip of angle of 75-90, and
This holds the disc in place while it is spun and shaped. To stop it from flapping while spinning, the maker uses pliers to turn the edges in. They then press a lever against the disc to shape it into a flare. This is a very delicate task, and must be performed by a professional because the shape of the flare effects the tone of the instrument. Once the shape has been perfected, they use a torch to braze, or connect, the bell stem to the flare. The now connected stem and flare are turned on a mandrel, a machine used to shape things, and presses against the seam with a wooden tool to smooth it out. The mandrel simply clamps down the brass piece to keep it secure during this
This technique is implemented with the support of a titanium or gold bar that anchors a set of acrylic teeth in the decayed place. The bar is a fixed and can only be detached by a dentist. With the help of this advanced denture technique, we offer you with full fixed teeth in a day even though you don’t have enough bones for this denture treatment.
One of the single best structure to lose unwanted embody fat and gain angle hooligan that crapper boost your metabolism is to process the amount of angle accelerator in your diet.
Invisalign - This is dental grade plastic aligners that are used to gently push teeth into proper alignment. This treatment is best for minor
• Repositioning the teeth so that there is room for the molar to come through. This may be done with orthodontic appliances, such as braces.
Bisecting the angle technique: The vertical angulation of the tube head is directed so that the central ray is perpendicular to an imaginary line that bisects the angle formed by the long axis of the tooth and the plane of the film.
Mechanical stage - The mechanical stage is the part of the microscope that you will put your slide on. It holds the slide and enables it to move around.
corrected forces. Specific data on these corrections may be found in Tables 7 and 8 in the Appendix.
A bolted connection with slotted holes on the horizontal leg will be best for greatly reducing uplift stresses on the fascia and allows flexibility on the geometry of the connection
A carotid angioplasty with stenting. This is a nonsurgical interventional procedure. A wire mesh (stent) is used to widen the blocked carotid arteries.
The Association for the Study of Internal Fixation (AO) formed in 1958 to improve and standardize the state of internal