What is the use of inlet guide vanes?
Inlet Guide Vanes (IGVs) and Inlet Butterfly Valves (IBVs) perform an important task—to regulate the airflow and pressure that enters a centrifugal compressor’s first stage of compression. Historically, IBVs had been the industry standard for centrifugal compressors.
How do you calculate guide vane angle?
Work done per second per unit weight of the water striking the vane per second is given by equation.
- 1g[Vw1+Vw2]×uNm/N (+ve sign is taken as B is an accute angle)
- Vw1=20.53m/s.
- Vw2=GH−GF=Vr2cosϕ−u2=12.36cos7.03−11=1.26m/s.
- u=u1=u2=11m/s.
- 19.81[20.53+1.26]×11=24.43Nm/m.
What are nozzle guide vanes made of?
Nozzle guide vanes (NGVs) are important structural parts of gas turbines [1]. NGVs are typically made from Ni-based superalloys because they have to withstand very high temperatures and aggressive environments [2].
What is IGV angle?
Inlet Guide Vane Tracking (IGVT) The Inlet Guide Vane (IGV) is located in the compressor inlet of the gas turbine. The IGV varies opening angle to regulate how much air entering the compressor.
Why do some turbine engines use variable inlet guide vanes?
The variable guide vanes (VGV) of gas turbine engines are commonly utilized to expand operating range and to improve efficiency of the compressor. Guiding air flow using the VGVs in the compressor prevents aerodynamic instability by making proper incidence angle to the blades.
Why is Francis turbine used?
Francis turbines are used frequently in hydroelectric power plants. In these plants, high pressure water enters the turbine through the snail-shell casing (the volute). This lowers the pressure as the water curls through the tube, but the speed of the water is maintained.
What is guide vane angle at inlet?
The guide vane is used to undertake the flow from the impeller outlet and recycle tangential energy. For the design working conditions, the guide vane inlet angle matches the flow direction of the impeller outlet.
Do nozzle guide vanes rotate?
Contrarotating Turbine The remaining nozzle guide vanes are, in effect, turbine blades attached to a rotating casing, which revolves in the opposite direction to a rotating drum.
What is nozzle guide vane?
Nozzle guide vanes (NGVs) are static components mounted into the casings of gas turbine engines as e.g. aircraft turbines. Typically, nozzle guide vanes are designed to convert part of the gas flow’s heat and pressure energy into a tailored kinetic energy from which rotor blades can generate power.
What is the use of guide vanes in Francis turbine?
The guide vanes direct the flow from the spiral casing and the stay vanes towards the runner, regulating the desired discharge. A parametric design tool with normalized geometrical constraints was created in MATLAB, suitable for generating guide vane cascade geometries for Francis turbines.
What are the 5 main components of a Francis turbine?
Main Components of Francis Turbine
- Spiral Casing. Spiral casing is the inlet medium of water to the turbine.
- Stay Vanes. Stay vanes and guide vanes guides the water to the runner blades.
- Guide Vanes.
- Runner Blades.
- Draft Tube.
https://www.youtube.com/watch?v=w-Jfi0hZ65Y