Abstract: The electric supercharger driven by a brushless motor with high-speed is developed to solve the problem of acceleration smoke caused by the turbocharger sluggish response. Its rotate speed is from 6.0 r/min to 24.0 kr/min, and the maximum flux is 0.1 kg/s. The structure design of the electric supercharger is novel, which makes it dispensable to set the lubricating installation and easy to assemble. The velocity distribution at the outlet of the electric supercharger is determined by hot-wire anemometry under various rotate speeds in steady state. Further more, the trends of the flux and charge rate with various speeds are analyzed. In addition, the transient response is detected from motor setup to smooth running within 10 s, 15 s, 20 s and 25 s respectively, and the characteristic of the transient flux is on pilot study. Research results indicate that the electric supercharger can respond rapidly with the great flux, and it is independent of the operating conditions of diesel engine. So it is a feasible way to reduce the smoke emission and improve the acceleration performance.

Key words: Flux characteristic, Electric supercharger, Hot wire anemometry, Transient state