Performance Improvement of a Centrifugal Compressor by Passive Means

Table 4

Effect of tip clearance on 𝜓_max and 𝜂_max.

Details of configuration	τ (%)	𝜓max	𝜙 at 𝜓max	𝜂 at 𝜓max	𝜂max	𝜙 at 𝜂max
	2.2	1.188	0.169	44.5	47.1	0.217
Without passive means	5.1	1.173	0.156	39.9	45.4	0.237
	7.9	1.153	0.121	31.9	45.5	0.230
	2.2	1.191	0.132	38.8	47.6	0.250
TG only	5.1	1.172	0.121	34.7	48.0	0.250
	7.9	1.167	0.113	35.2	44.9	0.241
	2.2	1.204	0.139	44.8	49.7	0.237
PS only	5.1	1.186	0.109	36.6	49.4	0.241
	7.9	1.185	0.101	33.5	48.6	0.222
	2.2	1.205	0.135	40.0	50.0	0.207
TG + PS	5.1	1.192	0.146	40.9	49.3	0.237
	7.9	1.170	0.128	33.9	46.8	0.248