Studies on Nozzle Flow at Beneficial and Adverse Flow Conditions and Effectiveness of Flow Control Management

The present study focuses on developing the flow pattern in a suddenly expanded duct of diameter 25 mm. Accordingly, CD nozzles were designed using isentropic relations. Mach numbers of the current study are 1.48, 1.6, 1.8, and 2. Experiments were done at the design NPR, adverse pressure, and the beneficial pressure. When the tests are done, using dynamic control is ineffective at Mach 1.8 at design NPR. For Mach 2, the flow control is useful. It increases the pressure when the same flow management technique is used for a fixed level of over-expansion of 0.277, and control efficacy is insignificant. The flow field is identical with no control and control. When the investigation was done for an under-expanded case, the dynamic control increased the pipe pressure.