关键词: 罗茨机械增压器, 绝热效率, 容积效率, 轴功率, 噪声

Abstract: A performance test-bed of superchargers was created, the adiabatic efficiency, volume efficiency, shaft power consumption and noise of the independently developed ZNR2.4 Roots superchargers were studied. The variation rules of ZNR2.4 Roots superchargers with the speed and pressure ratio were obtained. The results show that the adiabatic efficiency is affected by the compression ratio and the adiabatic efficiency is the highest when the pressure ratio is near 1.3. The volume efficiency increases with the increase of speed, and it is higher than 70% when the speed is above 3 500 r/min. The shaft power increases with the increase of speed, and the maximum is 0.7 kW. The noise increases with the increase of speed, but the average sound pressure level is less than 85 dB(A), the maximum will not be more than 95 dB(A). The research results provide the experimental reference for the subsequent improvement and optimization of the Roots superchargers.

Key words: Roots supercharger, adiabatic efficiency, volume efficiency, shaft power, noise