A unique gas injection technique has been developed which has rapid response and is capable of supplying gas flowrates up to 5 kg/s at pressures of 3.45times;106N/m2. Rise times to equilibrium pressure varied from 7 to 15 ms over the operating range. The reliability, excellent repeatibility, and uniform pressure have shown the system to be superior to previously utilized expansion tube gas injection techniques associated with very short duration impulse test facilities. The achievement of precise timing control of the valve opening permitted a complex electronic sequencing of facility events. An additional feature of automatic gas supply shuthyphen;off resulted in significant cost savings when rare gases were used as injectants.
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