Flatback Titanium Compressor Wheel Components Faster Spool Up Optimized Structure

The marine turbocharger, also known as exhaust gas turbocharger, is the main equipment in the diesel engine boosting system. It consists of a single-stage exhaust gas turbine and a centrifugal compressor. They are mounted on the same shaft to form the moving part of the marine turbocharger/exhaust gas turbocharger - the rotor. The function of the marine turbocharger/exhaust gas turbocharger is to use the diesel exhaust energy to drive the turbine to drive the compressor on the coaxial to increase the air pressure into the cylinder, so that the diesel engine power is greatly improved. The exhaust turbocharger approximately doubles the power of the diesel engine, but its weight is only increased 10%.

Marine turbocharger/Exhaust gas turbochargers operate at high speeds, high exhaust gas temperatures, high air and exhaust gas flow rates, and high flow rates. Generally, the pressure of the exhaust gas is 0.25-0.45 MPa, and the exhaust gas temperature is 500-600 °C. The speed varies with the size of the Marine turbocharger / supercharger. The maximum speed of the large-sized supercharger is 10000 r/min, and the maximum speed of the small-sized supercharger can reach 40,000~50000r/min. Therefore, the marine turbocharger/exhaust gas turbocharger is a precision machine.

Turbocharger design features:

Turbo compressor impeller (also called compressor wheel) belongs to one part of turbocharger with the design features as below:

• Supercharger is a axial-flow turbocharger.

• Turbochargers adopts inboard plain bearing, uncooled casings and lubricated by the engine's lube oil system.

• For engine power output range from 1,650 to 24,500 kW per turbocharger;

• Axial flow turbine inboard plain bearing design;

• Lubricated by the engines lube oil system;

• Suitable for a wide variety of fuels, heavy fuel, diesel oil, biofuel and gas operation;

• Simple and durable design;

The description of turbo compressor impeller:

The turbo compressor impeller (compressor wheel) is of aluminium alloy or the more expensive titanium. Manufactured from a single casting, it is located on the rotor shaft by splines.

Aluminium impellers have a limited life, due to creep, which is dictated by the final air temperature. Often the temperature of air leaving the impeller can be as high as 200°C.

The life of the impeller under these circumstances may be limited to about 70000 hours. To extend the life, air temperatures must be reduced. One way of achieving this is to draw the air from outside where the ambient air temperature is below that of the engine room.

Efficient filtration and separation to remove water droplets is essential and the impeller will have to be coated to prevent corrosion accelerated by the possible presence of salt water.