Exam Question
Explain the modern methods of turbo charging available such as: (16)
(a) Pulse converter system
(b) Sequential turbo charging
(c) Two stage turbo charging
(d) Variable geometry turbochargers
Class 2 (2nd Engineer)
MEKM
📅 Feb 2024
Reference Answer
Modern methods of Turbocharging:
(a) Pulse Converter System:
In medium-speed engines, pulse systems are commonly used. Their main advantage is rapid response to load changes, but this comes at the cost of reduced efficiency due to long intervals between gas inlet and partial gas loss (inherent in multi-inlet turbine designs). To improve performance, a pulse converter system partially converts pulse energy into kinetic energy before the gas reaches the turbine, while still retaining some pulse energy. Exhaust gas enters a pre-set manifold, connected via a carefully designed pipe to a two-branched manifold feeding a single turbine. This pipe design minimizes pressure pulse transmission between exhaust pipes, preventing one cylinder's exhaust from interfering with another's scavenging process. Pulse converters also simplify exhaust piping by eliminating the need for complex multi-entry turbocharger casings.
(b) Sequential Turbocharging:
(a) Pulse Converter System:
In medium-speed engines, pulse systems are commonly used. Their main advantage is rapid response to load changes, but this comes at the cost of reduced efficiency due to long intervals between gas inlet and partial gas loss (inherent in multi-inlet turbine designs). To improve performance, a pulse converter system partially converts pulse energy into kinetic energy before the gas reaches the turbine, while still retaining some pulse energy. Exhaust gas enters a pre-set manifold, connected via a carefully designed pipe to a two-branched manifold feeding a single turbine. This pipe design minimizes pressure pulse transmission between exhaust pipes, preventing one cylinder's exhaust from interfering with another's scavenging process. Pulse converters also simplify exhaust piping by eliminating the need for complex multi-entry turbocharger casings.
(b) Sequential Turbocharging:
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