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Increased operating flexibility has been identified as an important feature of national gas pipeline engines. In order to increase engine operating flexibility and still maintain high operating efficiencies coupled with constrained pollutant emissions, the turbocharger needs to be able to operate at high efficiency and to be able to deliver required amount of air at over a large operating range. Unfortunately, the convention turbocharger for supplying that air depends on the engine speed so that large toque, to the compressor, is available only in narrow portion of the speed range. In order to increase the boost pressure at off design conditions, there exist today several ideas including variable geometry turbochargers. “Variable Geometry” is not a new idea. There exist today several schemes that have been proposed, or tried, to implement the idea of varying the flow no only in the turbine but also in the compressor by varying the physical features of the internal flow passage. The aim of this paper is to explore the idea of using the compressor as a variable diffuser vane on compressor performance and on the incidence losses. The CFD analysis has been carried out by modeling the compressor of one of the widely used turbocharger in the natural gas transmission industry. The three-dimensional compressible Navier-Stokes equation was modeled with the low Reynolds number turbulence model to capture precisely the losses in the near-wall regions. The model was validated and compared with the experimental collected on the NGML's Turbocharger Test and Research Facility. This paper demonstrates the impact of variable diffuser vanes on the compressor operating characteristics. It shows how the flow range and the off design and transient performance of a compressor can be improved by incorporating the variable diffuser vanes instead of fixed diffuser geometry. The paper concludes with the simulation of the compressor for different diffuser vane angle settings and the compressi
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