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A fuel cell system having a gas-liquid separator that comprises (a) a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet; (b) a plurality of baffles arranged in longitudinally spaced serial relation in and along the passage and ea

A fuel cell system having a gas-liquid separator that comprises (a) a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet; (b) a plurality of baffles arranged in longitudinally spaced serial relation in and along the passage and each blocking a portion of the cross section of the passage; and (c) means mounting the baffles for relative movement to selectively vary the composite cross-sectional blockage defined by the baffles relative to a sensed parameter of the fuel cell system.

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1. A fuel cell system having a gas-liquid separator, said gas-liquid separator comprising:a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet; a plurality of baffles arranged in longitudinally spaced serial relation in and along

1. A fuel cell system having a gas-liquid separator, said gas-liquid separator comprising:a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet; a plurality of baffles arranged in longitudinally spaced serial relation in and along the passage and each blocking a portion of the cross section of the passage; and means mounting the baffles for relative movement to selectively vary the composite cross-sectional blockage defined by the baffles relative to a sensed parameter of the fuel cell system. 2. A fuel cell system having a gas-liquid separator according to claim 1 wherein each baffle is mounted for rotation about a central axis extending through the passage.3. A fuel cell system having a gas-liquid separator according to claim 2 wherein each baffle includes a central hub positioned on the axis and a plurality of circumferentially spaced vanes extending radially outwardly from the hub.4. A fuel cell system having a gas-liquid separator according to claim 3 wherein the vanes of each baffle block a given percentage of the cross-sectional area of the passage so that first and second successive baffles in the passage may be relatively rotated to define a composite cross-sectional blockage varying from the given percentage of the cross-sectional passage area to a larger percentage of the cross-sectional passage area.5. A fuel cell system having a gas-liquid separator according to claim 4 wherein the vanes of each baffle block approximately one half of the cross-sectional area of the passage so that first and second successive baffles in the passage may be relatively rotated to define a composite cross-sectional blockage varying from approximately one half of the cross-sectional passage area to essentially all of the cross-sectional passage area.6. A fuel cell system having a gas-liquid separator according to claim 1 wherein the separator further includes means operative to relatively move the baffles.7. A gas-liquid separator comprising:a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet: a plurality of baffles arranged in longitudinally spaced serial relation in and along the passage and each blocking a portion of the cross section of the passage; and means mounting the baffles for relative movement to selectively vary the composite cross-sectional blockage defined by the baffles, wherein the separator further includes means operative to relatively move the baffles; and the moving means comprises bimetal means drivingly associated with the baffles and operative to relatively move the baffles in response to environmental temperature variations. 8. A gas-liquid separator comprising:a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet; a plurality of baffles arranged in longitudinally spaced serial relation in and along the passage and each blocking a portion of the cross section of the passage; and means mounting the baffles for relative movement to selectively vary the composite cross-sectional blockage defined by the baffles, wherein the separator further includes means operative to relatively move the baffles; the separator is intended for use in conjunction with a fuel cell; and the moving means comprises an actuator drivingly associated with the baffles and means operative to generate a control signal for delivery to the actuator reflecting sensed parameters of the fuel cell. 9. A gas-liquid separator according to claim 8 wherein the sensed parameters of the fuel cell include one or more of the humidity of a compressed gas stream delivered to the fuel cell, the mass flow rate of the gas stream, the temperature a pressure within the fuel cell, and the electrical current produced by the fuel cell.10. A fuel cell system having a gas-liquid separator according to claim 4 wherein:the separator includes a central shaft positioned on the axis; and the central hubs are annular and are fitted over the shaft in serial stacked relation. 11. A fuel cell system having a gas-liquid separator according to claim 10 wherein:the separator further includes an actuator rotatably driving the shaft; and selected hubs of selected baffles are keyed to the shaft so that rotation of the shaft by the actuator relatively rotates the baffles. 12. A fuel cell system having a gas-liquid separator according to claim 10 wherein the baffles are modular units that may be readily slipped on and off of the shaft to vary the number of baffles in the separator and thereby vary the separation efficiency of the separator.13. A fuel cell system having a gas-liquid separator according to claim 12 wherein the housing is sectional and includes modular components which may be interchanged to vary the size of the housing in accordance with the number of modules employed.14. A fuel cell system having a gas-liquid separator according to claim 1 wherein the gas-liquid separator comprises a water separator.