Abstract: As the main contributor to the overall noise level of air-conditioners, the noise from the compressor is essential to be analyzed and suppressed. The wall pressure pulsations of accumulator are obtained through numerical simulations based on finite volume method, which shows that the highest pressure pulsation locates at the inlet of compressor and the lowest pressure pulsation is in the cavity of accumulator. Then the flow velocity phase difference of two pipes is utilized and the single-pipe accumulator with two branches is utilized for replacing the two-pipe suction accumulator. Numerical computation shows that turbulent pressure pulsations are greatly attenuated. The noise measurement shows the 1.2 dB(A) reduction for the single-pipe accumulator, which validates the numerical calculation and theoretical analysis.

Key words: Accumulator, Acoustic performance, Pressure pulsation, Two-cylinder compressor