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3 Controlled pulse turbocharging

« Diesel Engine Pulse Turbocharging.

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Pulse turbocharging increases the available energy but also increases the instable flow through turbine. When in instability flow, how does the turbine work and how effective it is? The energy included in the waste gas flow can be obtained by applying instantaneous turbine energy equation and a cyclic integral (figure 2). In this way, turbine inlet air temperature, pressure and efficiency can be obtained.

Pulse turbocharging increases the available energy but also increases the instable flow through turbine. When in instability flow, how does the turbine work and how effective it is? The energy included in the waste gas flow can be obtained by applying instantaneous turbine energy equation and a cyclic integral (figure 2). In this way, turbine inlet air temperature, pressure and efficiency can be obtained.

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  • 9.
    Codan E, Vlaskos I, Kyrtatos N, Alexandr N (2005) The charging of a medium/high speed 5-cylinder diesel engine with controllable pulse turbocharging. In: Proceedings of the 10th Supercharging Conference, Dresden, Germany, September 2005
  • A turbocharger, or turbo (colloquialism), from Greek "τύρβη" ..

    For multi-cylinder engine, small diameter exhaust manifold from several cylinders connect to the turbine through an exhaust pipe. Figure 3 shows a 3-cylinder 4-stroke automotive engine system. Due to the phase angle of exhaust valves open between cylinders are 240°. There is a small overlapping angle between cylinders. So, pulse turbocharging mean turbine efficiency is lower than well-matched constant turbocharging system (work near the peak of turbine curve), but the pressure pulse sequence reach the turbine is stable. Actually, it eliminates the long time clearance loss; another key point should be taken into consideration, which is during the air valve overlapping (scavenging), exhaust pressure is close to cylinder pressure. For constant pressure turbocharging system, when the inlet and exhaust valve are opened, he fine pressure drop between inlet and exhaust air pipe is very important for 4 stroke engine with air valve overlapping, as well as for 2-stroke engine. Figure 4 shows the pressure curve of inlet and outlet air pipe, the pressure drop of inlet and outlet valve overlapping using shadow to show. Obviously, working under the condition of the figure shows, pressure drop is satisfying.

    For multi-cylinder engine, small diameter exhaust manifold from several cylinders connect to the turbine through an exhaust pipe. Figure 3 shows a 3-cylinder 4-stroke automotive engine system. Due to the phase angle of exhaust valves open between cylinders are 240°. There is a small overlapping angle between cylinders. So, pulse turbocharging mean turbine efficiency is lower than well-matched constant turbocharging system (work near the peak of turbine curve), but the pressure pulse sequence reach the turbine is stable. Actually, it eliminates the long time clearance loss; another key point should be taken into consideration, which is during the air valve overlapping (scavenging), exhaust pressure is close to cylinder pressure. For constant pressure turbocharging system, when the inlet and exhaust valve are opened, he fine pressure drop between inlet and exhaust air pipe is very important for 4 stroke engine with air valve overlapping, as well as for 2-stroke engine. Figure 4 shows the pressure curve of inlet and outlet air pipe, the pressure drop of inlet and outlet valve overlapping using shadow to show. Obviously, working under the condition of the figure shows, pressure drop is satisfying.