Abstract
In the present paper, the experimental and numerical investigations are performed to clarify the mechanism of the side load in rocket nozzles using two types of nozzles-modified ideal nozzle and modified compressed truncated perfect (CTP) nozzle. In the experiment, the flow field is visualized by the Schlieren method and asymmetric flow patterns are observed. In the modified CTP nozzle, two types of the separation patterns are observed. One is "free shock separation" and the other is "restricted shock separation." The numerical simulations predict that the transition of separation pattern from the FSS to the RSS causes a large impulsive side load. It is also shown that the flow in a two-dimensional nozzle can be three dimensional due to flow separation on the side wall.
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