Fluid-Dynamic Supercharger 2008-01-0299

The current trend to downsize automotive engines calls for engine performance recovery via torque enhancement techniques, such as hybrid drive or supercharging. Traditional supercharging techniques using mechanical chargers or turbochargers are costly and have a limited time response [1]. This study investigates a fluid-dynamic supercharger (FDS) operated by compressed air which provides momentary supercharging during increased torque demand. FDS offers precise, computer-controlled boost of up to 11 psi (75 kPa) with instant response to demand. Compressed air for FDS operation can be generated using recovery of kinetic energy during vehicle deceleration. FDS is compact, simple, economical, and it does not require an intercooler. Simulations show that even with a down-sized engine, an FDS-equipped automotive vehicle would be “fun-to-drive.”