MAN Two Stage Turbo charging

By Keith Henderson at June 13, 2010 16:29
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Lower exhaust emissions of large bore diesel engines without after treatment, can be realized by increasing the mean effective pressure. One way to achieve a higher m.e.p. is to increase the boost pressure of the turbocharger however standard turbo designs are already at or approaching the limit of their capability to go from atmospheric pressure to the desired boost pressure in one unit: the solution is therefore to use two turbo stages. Simply, it comprises a low pressure turbine feeding via an inter cooler a second high pressure turbine which in turn passes through a second inter cooler to the engine. Control of a two stage turbo system including the suppression of compressor surging.is complex and is effected with the aid of variable nozzle rings (VTA) and bypasses. MAN Diesel & Turbo have recently announced their own series of two-stage turbos called the New TCX Generation. Using a configuration with the turbos at 90 degrees to each to provides a compact solution and reduce the amount of piping.
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