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EXPLAIN TWO STAGE CHARGE TURBOCHARGING SYSTEM?

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  • EXPLAIN TWO STAGE CHARGE TURBOCHARGING SYSTEM?

    EXPLAIN TWO STAGE CHARGE TURBOCHARGING SYSTEM?

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    In this system consists of differently sized turbochargers are used in sequence, but both operate continually. The first turbo boostspressure as much as possible. Subsequent turbos take charge from the previous stage and compress it further.

    This type of turbocharging is required for engines requiring a high degree of supercharging.

    The exhaust mass flow coming from the cylinder flows into the exhaust manifold first. Here it is possible to expand the entireexhaust mass flow using the high-pressure turbine (HP) or to redirect some of the mass flow through a bypass to the low-pressureturbine (LP). The entire exhaust mass flow is then utilized again by the low-pressure turbine (LP).

    The entire fresh air flow is first compressed by the low-pressure stage. In the high-pressure stage, it is compressed further, and then the charging air is cooled. Due to the pre-compression process, the relatively small HP compressor can reach a high-pressure levelso that it can force the required amount of air to flow through the system.

    At low engine speeds, i.e. when the exhaust mass flow rate is small, the bypass remains completely closed, and the entire exhaustmass flow is expanded by the HP turbine. This results in a rapid and high boost pressure rise. As the engine speed increases, the jobof expansion is continuously shifted to the LP turbine by increasing the cross-sectional area of the bypass accordingly.
    Last edited by deepak; 12-22-2017, 02:37 PM.

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