Effect of exhaust gas turbocharging on the power concentration of modern diesel and gas engines and its realization with MAN B&W exhaust gas turbochargers

A consideration of the theoretic relations of the combustion and load changes with the power exploitation of an engine proves that an increase in power concentration is only reasonably possible by exhaust gas turbocharging. The individual development steps of the compressor and their specific characteristics are explained. As the realization of the present-day pressure ratios requires high material utilization, the operating stress must be exactly known. To comply with the rising engine requirements, the accurate matching of the turbocharger to the engine gains more and more importance. MAN B&W have developed a turbocharger production programme that covers the engine's requirements. One possibility to improve the dynamic operating behaviour of high-duty engines is sequential turbocharging, which makes high demands both on the acceleration behaviour and also on the thermal stability of turbochargers. MAN B&W carried out appropriate tests on the burner rig, and S.E.M.T. Pielstick finally implemented a corresponding test on a 20 PA6B STC engine.