Abstract
Stringent emission and fuel economy standards have led to the widespread use of turbocharged spark-ignition internal combustion engines in light-duty cars and trucks. However, advancements in impeller design and casing treatments to improve compressor performance and efficiency have introduced high-frequency noise. In particular, the elevation in tonal noise at the blade pass frequency (BPF) has become a significant contributor to the total sound pressure level in some of the modern automotive compressors. Due to high compressor rotational speeds, BPF noise occurs at relatively high frequencies where sound may propagate as multi-dimensional acoustic waves within the compressor ducting. The present work describes a compact experimental setup to examine the azimuthal non-uniformity of noise with the help of a rotating compressor inlet duct on a steady flow turbocharger gas stand. The rotating duct houses dynamic pressure transducers to capture time-resolved, in-duct acoustic pressure at different azimuthal locations. This experimental setup thereby facilitates the comparison of acoustic pressures at these angular locations for identical compressor steady flow operating conditions, while also scanning the compressor map of a contemporary turbocharger.
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