An aerodynamic jet steering scheme using a combination of blowing and suction near the exit plane of the primary jet is demonstrated. Previous studies involving synthetic jet actuators have shown that jet steering or vectoring is achieved when primary jet fluid is drawn into the suction slot, and that the vectoring force increases with primary jet speed. These studies were limited by the high-actuation frequencies required to maintain vectoring at high primary jet speeds. The present steady technique does not suffer from this limitation, and requires suction and blowing flow rates which are a small fraction of that of the primary jet. This arrangement is studied experimentally and numerically. The results are presented primarily in terms of turning angle. It is found that for sufficient blowing flow rates (similar to the suction flow rate) the resultant turning angle increases linearly with the suction flow rate regardless of Reynolds number (up to 21,000). For insufficient blowing, the jet may be turned in the opposite direction.
Experiments in Fluids – Springer Journals
Published: Feb 11, 2006
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