Azərbaycan xəZƏr dəNİz gəMİCİLİYİ” qsc azərbaycan döVLƏt dəNİz akademiyasi phş Kafedra: “Gəmi energetik qurğuları”

Impellers	Outer diameter of wheel, mm	Ball diameter of the wheel, mm	Wheel width, mm	Wheel blades diameter, mm
Wheel blade thickness, mm
Compressor impeller
Turbine impeller

Control questions

1. 
   What is the function of the supercharging system in internal combustion engines?
   

The function of the supercharging system in ICE is to provide more air inside the engine using the pressure generated from the exhaust gases.

2. 
   What methods are used to purge the upper part of marine internal combustion engines?
   

internal combustion engines use scavenging method to purge the exhaust gases from the upper part of the cylinder and replace them with fresh air for the next combustion cycle.

3. 
   What is the difference between pulsed and isobaric blowdown gas turbine systems and how are they implemented?
   

In pulsed blowdown, exhaust gases are expelled intermittently, creating pulses of high-pressure gas. Isobaric blowdown, on the other hand, maintains a more constant pressure during the exhaust phase.

4. 
   What makes gas turbochargers cool?
   

The air drawn from the atmosphere is used for cooling down the turbochargers in marine engines.

5. 
   What is the operating principle of gas turbochargers?
   

The operating principle of gas turbochargers involves utilizing exhaust gases from the engine to spin a turbine connected to a compressor. As the turbine spins, it drives the compressor, which compresses the incoming air before it reaches the engine's combustion chamber. This compressed air allows for a higher volume of air and fuel mixture, leading to improved combustion and increased engine power.

6. 
   What is the principle of operation of a centrifugal-type compressor?
   

A centrifugal compressor operates based on the principle of radial flow. Incoming air is directed into the center of the compressor impeller, where it is then accelerated radially outward by the spinning impeller.

7. 
   What is the principle of operation of an axial turbine?
   

An axial turbine operates on the principle of axial flow. In this design, air flows parallel to the axis of the turbine rotor. The rotor consists of multiple axial blades, and as high-velocity air passes through these blades, it imparts rotational motion to the rotor.

8. 
   What is the principle of operation of a radial turbine?
   

A radial turbine operates based on radial flow. In this design, incoming air enters the turbine in a radial direction, meaning it moves perpendicular to the axis of the rotor. The fluid flows through the radial blades, causing the rotor to spin as it changes the direction of the air flow. This rotation is then used to drive a shaft connected to the turbine.