Hi everybody!!! How is it going?
As I promised few days ago, I already uploaded the files containing the information about the design projects as well as a form you should fill up with the information about your team... Check out the "Download Page"...
I promised an exercise too so there you go...
Take care...
Alfredo Alvarez!
EJERCICIO
Se desea diseñar un compresor centrífugo de una etapa, procurando una entrada del fluido sin prerrotación a través de un área de 25cm2. Para asegurar un diseño sub-sónico Umax=280m/s. El motor de accionamiento gira a 3000rpm. d2/d1=2,1. Si Beta2=50° y Vr1=200m/s, y ; defina:
a) Ángulo Beta 1
Se desea diseñar un compresor centrífugo de una etapa, procurando una entrada del fluido sin prerrotación a través de un área de 25cm2. Para asegurar un diseño sub-sónico Umax=280m/s. El motor de accionamiento gira a 3000rpm. d2/d1=2,1. Si Beta2=50° y Vr1=200m/s, y ; defina:
a) Ángulo Beta 1
b) El trabajo específico requerido
c) El Caudal de Operación Óptimo
c) El Caudal de Operación Óptimo
d) La Potencia del motor
e) El grado de reacción
e) El grado de reacción
6 comentarios:
hola esta buena esta pajina explican el funcionamiento de un impulsor en una bomba
http://www.youtube.com/watch?v=XkYW6725kAc
aliniacion de un sello mecanico de una bomba
http://www.youtube.com/watch?v=nNH4xgR2Iaw&feature=related
Hi everyone, here are some of topics about Turbo-Machines:
CAVITATION
Cavitation occurs when pressure in the suction line falls below vapor pressure, vapor is formed and moves along with the stream. These vapor bubbles or cavities collapse when they reach regions of higher pressure on their way through the pump. The most obvious effects of cavitation are noise and vibration.
PREVENTING CAVITATION
Cavitation is prevented by preventing vapor formation within a pump
TEST TO CONFIRM HIGH VELOCITY CAVITATION
Close pump discharge control valve to reduce flow .If pump noise significantly reduces and conditions become stable, cause is confirmed
A pump is defined as a device that moves a liquid by increasing the energy level of the liquid. The pumps are divided into two distinct groups. One group pumps the liquid by means of positive displacement - the other group pumps the liquid by means of dynamic action.
Positive displacement
Increase pressure by operating on a fixed volume in a confined space
Types
Screw, gear, reciprocating
Characteristics
• Constant volume
• Variable differential head
• Relatively insensitive to liquid properties
• Relatively insensitive to system changes
• Not self-limiting
Dynamic
Increases pressure by using rotary blades to increase fluid velocity
Types
Centrifugal axial
Characteristics
• Variable volume
• Constant differential head
• Sensitive to liquid properties
• Sensitive to system changes
• Self-limiting
CENTRIFUGAL PUMP APPLICATIONS
• The following is not meant to be a complete list of centrifugal pump applications, but an illustration the versatility of this type of pump.
Water Supply
Low-lift pumps
sampling pumps
wash water pumps
High-service pumps
Booster pumps
Ground Water Wells
vertical turbine line-shaft pump
submergible pump
Sewage Treatment
raw sewage pump
settled sewage pump
service water pump
dilute sludge and scum pump
Drainage and Irrigation
deep well turbine pump
submergible turbine pump
propeller pumps
volute pumps
Fire Pumps
vertical turbine pump
horizontal volute pump
Steam Power Plants
condensate pumps
heater drain pumps
condenser circulating pumps
boiler circulating pumps
ash-handling pumps
Petroleum
crude distillation pumps
vacuum tower separation pumps
catalytic conversion pumps
alkylation pumps
hydro cracking pumps
coking pumps
pipeline pumps
Pulp and Paper Mills
heavy-black-liquid pumps
digester-circulating pumps
low- and intermediate-concentration stock pumps
Mining
All applications for open pit and deep mines including control of seepage, rainwater, and service water.
Food and Beverage
Used throughout the industry except when metering is required or when high viscosities such as dough or cottage cheese must be handled.
Refrigeration, Heating, and Air Conditioning
cooler tower water circulating pumps
hot water circulating pumps
brine circulation pumps
refrigerant circulation pumps
Hey what's going on?,The following topics are about basic information the meaning of some equations for pumps design.
NET POSITIVE SUCTION HEAD AVAILABLE (NPSHA)
• Available NPSH is a characteristic of the pumping system. It is defined as the energy that is in a liquid at the suction connection of the pump.
NET POSITIVE SUCTION HEAD REQUIRED (NPSHR)
• Required NPSH is the energy needed to fill a pump on the suction side and overcome the frictional and flow losses from the suction connection to that point in the pump at which more energy is added. Required NPSH varies with pump design, pump size, and operating conditions and is supplied by the pump manufacturer.
BERNOULLI’S THEOREM
• Energy cannot be created or destroyed. The sum of three types of energy (heads) at any point in a system is the same in any other point in the system assuming no frictional losses or the performance of extra work.
BRAKE HORSEPOWER
• Brake horsepower is the total power required by the pump to do a specified amount of work.
VISCOSITY
• Viscosity is the internal friction of the liquid or that property that resists any force tending to produce flow. Absolute (or dynamic) viscosity is usually expressed in centipoise.
• Kinematic viscosity is the ratio of absolute viscosity to density and is expressed in centistokes (SSU). with temperature change, decreasing as the temperature is
increased.
• Many liquids such as water and mineral oil are considered Newtonian and do not change in viscosity with a change in rate of shear or agitation. Liquids such as grease, syrups, glues, and varnishes are called Thixotropic. These show a marked reduction in viscosity as the rate of shear is increased. Other liquids such as clay slurries, some starches and paints, and milk chocolate with filler are referred to as
Dilatant. They show an increase in viscosity as the rate of shear is increased.
• Viscosity is measured by viscometers such as Saybolt (U.S.), Bedwood (U.K.), and Engler (Germany).
Publicar un comentario