Performance Improvement of a Centrifugal Compressor by Passive Means

Table 2

Configurations tested.

τ (%)	2.2%	5.1%	7.9%
Basic configuration; (without passive device)	Config. 1	Config. 9	Config. 12
With TG only	Config. 3	Config. 10	Config. 11
With PS only	Config. 6	Config. 7	Config. 14
With TG + PS	Config. 5	Config. 8	Config. 15
With TG^* only	Config. 2	—	—
With TG^** + TG	Config. 4	—	—
With TG^*** only	—	—	Config. 13

TG: turbulence generator on the casing at 15 mm upstream of inducer tip leading edge.
TG^*: turbulence generator on the casing at 30 mm upstream of inducer tip leading edge.
TG^**: turbulence generator on the hub at 30 mm upstream of inducer hub leading edge.
TG^***: turbulence generator on the casing at 400 mm dia.
PS: partial shrouds on the tip of the blade.