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An apparatus for improving the performance of a radial compressor 36 forming part of an inlet system of an engine 10 is disclosed in which the configuration and positioning of a flow management device 137 used to generate pre-whirl is optimized so as to produce a pressure drop below a maximum accept

An apparatus for improving the performance of a radial compressor 36 forming part of an inlet system of an engine 10 is disclosed in which the configuration and positioning of a flow management device 137 used to generate pre-whirl is optimized so as to produce a pressure drop below a maximum acceptable level. An inlet duct ‘I’ connected to the radial compressor 36 has a tapered end portion so that a flow management device 137 of a larger diameter d2 can be accommodated than the diameter d1 of an inlet port ‘IP’ to the radial compressor 36.

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1. An engine inlet system, comprising: a compressor having an inlet port;an inlet duct having at least one bend and a tapering section connected to the inlet port; anda flow management device having radially-extending, fixed vanes coupled upstream of the tapering section and downstream of the at lea

1. An engine inlet system, comprising: a compressor having an inlet port;an inlet duct having at least one bend and a tapering section connected to the inlet port; anda flow management device having radially-extending, fixed vanes coupled upstream of the tapering section and downstream of the at least one bend to impart a swirling motion at the inlet port having a negative swirl magnitude of between about 0.1 and 2.0. 2. The inlet system of claim 1 wherein effective flow area of the flow management device is based on an inside diameter of the flow management device minus an area occupied by the vanes. 3. The inlet system of claim 1 wherein effective flow area of the flow management device is greater than the smallest flow area that prevents an unacceptable back pressure at the largest expected flow rate. 4. The inlet system of claim 1 wherein the cross-sectional area of the inlet duct minus an area occupied by the vanes is greater than a predetermined area. 5. The inlet system of claim 1 wherein the cross-sectional area of the inlet port decreases uniformly as distance from the compressor decreases. 6. An inlet system for an engine, comprising: a radial compressor mounted in a compressor housing including inlet and outlet ports;a tapering inlet duct having a bend connected to the inlet port; anda flow management device having radially-extending fixed vanes spaced from the inlet port downstream of the bend to impart a negative swirl having a non-dimensional swirl number of between about minus 0.1 and minus 2.0 to the gas entering the inlet port. 7. The inlet system of claim 6 wherein the radial compressor is one of a compressor of a turbocharger and a compressor of a supercharger. 8. An internal combustion engine, comprising: an inlet manifold for supplying air to the engine;a radial compressor;an inlet port to the radial compressor;an outlet port from the radial compressor coupled to the inlet manifold;an inlet duct connected to the inlet port to provide air to the radial compressor, wherein the inlet duct has at least one bend; anda flow management device having a number of radially-extending fixed vanes positioned in the inlet duct upstream from the inlet port and downstream of the at least one bend to impart a swirling motion to the gas entering through the inlet port having a magnitude that falls within a range of negative swirl of between about 0.1 and 2.0, wherein the inlet duct tapers such that the cross-sectional area of the inlet duct decreases as the distance from the inlet port decreases, the flow management device having an effective cross-sectional area greater than a predetermined area and positioned upstream relative to where the inlet duct tapers. 9. The engine of claim 8 wherein the effective flow area is based on an inside diameter of the flow management device minus an area occupied by the vanes. 10. The engine of claim 8 wherein the predetermined area is the smallest flow area that prevents an unacceptable back pressure at the largest expected flow rate. 11. The engine of claim 8 wherein the cross-sectional area of the inlet duct minus an area occupied by the vanes is greater than the predetermined area.