Tailored Centrifugal Turbomachinery for Electric Fuel Cell Turbocharger

Table 1

Mass flow (MFP), pressure ratio (PR), efficiency (Efft), and turbine recuperation rate () for different operating conditions (OP) of a fixed geometry turbine (FGT) and a variable turbine (VGS).

		OP	H	B	L	L1	H1	L2	B2
Stack	PR	—	2.21	1.90	1.51	1.57	2.28	1.37	1.81
	MFP	(kg/s) K^0.5 Pa^−1	1.38	1.34	1.17	0.90	1.15	1.93	1.72
Fixed geometry turbine	PR	—	2.21	1.90	1.51	1.38	1.97	1.37	1.81
	MFP	(kg/s) K^0.5 Pa^−1	1.38	1.34	1.17	1.02	1.33	0.91	1.27
	Efft	—	0.75	0.75	0.74	0.68	0.71	0.52	0.70
		%	37.0%	38.6%	39.3%	28.0%	30.7%	9.0%	23.4%
VGS turbine	PR	—	2.21	1.90	1.51	1.57	2.28	1.37	1.81
	MFP	(kg/s) K^0.5 Pa^−1	1.38	1.34	1.18	0.90	1.15	1.93	1.72
	Efft	—	0.73	0.73	0.72	0.69	0.72	0.46	0.66
		%	36.3%	37.8%	38.5%	38.4%	36.6%	16.8%	30.0%