Search results
Results from the WOW.Com Content Network
Cooling air for the turbine vanes undergoes a similar process. Cooling the leading edge of the blade can be difficult, because the pressure of the cooling air just inside the cooling hole may not be much different from that of the oncoming gas stream. One solution is to incorporate a cover plate on the disc.
In case of turbine blades, the leading edge has maximum temperature and thus heat load. Impingement cooling is also used in mid chord of the vane. Blades are hollow with a core. [41] There are internal cooling passages. Cooling air enters from the leading edge region and turns towards the trailing edge. [40]
The most common implementations of VGTs are Variable-Nozzle Turbines (VNT), Sliding Wall Turbines, and Variable Flow Turbines (VFT). Variable-Nozzle Turbines are common in light-duty engines (passenger cars, race cars, and light commercial vehicles). The turbine's vanes rotate in unison, relative to its hub, to vary its pitch and cross ...
Diagram of a typical gas turbine jet engine Frank Whittle Hans von Ohain. The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and a turbine (that drives the ...
The hot route may require changes in turbine blade/vane materials or better blade/vane cooling. The cold route can be obtained by one of the following: adding booster stages to the LP/IP compression; adding a zero-stage to the HP compression; improving the compression process, without adding stages (e.g. higher fan hub pressure ratio)
A Variable Geometry Turbocharger [4] has movable vanes which direct the flow of exhaust onto the turbine blades. Actuators are used to adjust the vane angles. Angle of vanes vary throughout the range of RPM to optimize turbine behaviour. At high engine speed, vanes are fully open and the exhaust is fully directed onto the turbine blades.
The simplest inlet to a centrifugal compressor is typically a simple pipe. Depending upon its use/application inlets can be very complex. They may include other components such as an inlet throttle valve, a shrouded port, an annular duct (see Figure 1.1), a bifurcated duct, stationary guide vanes/airfoils used to straight or swirl flow (see Figure 1.1), movable guide vanes (used to vary pre ...
It has to be maintained to prevent backflow in the turbine cooling circuits since cooling air from the HP compressor needs a lower pressure at the turbines in order to flow. [94] [95] Cooling air from the compressor (blue) has to flow to the turbine area (nozzle guide vane painted orange). This is enabled by the drop in pressure which occurs in ...