Abstract
In the present paper, the experimental and numerical investigations are performed to clarify the mechanism of the side load in the 2 D dual bell nozzles using two types of nozzle models. In the experiments, the flow field was visualized by the schlieren method and asymmetric one-side-attached jet patterns were observed. The asymmetric flow field produced the asymmetric wall pressure distributions, resulting in the side load occurrence. The numerical simulations show that the jet oscillations result in the asymmetric jet patterns. The jet oscillations are induced by the alternate vortex shedding from the shear layer between the jet and the atmosphere, resulting in the asymmetric movements of the separation points on the 2 nd nozzle surfaces.
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