Abstract
Needle valve response to input signal is controlled – apart from the dynamics of the driving mechanical actuator – by interaction of fluidic and mechanic aspects. Despite the long history and ubiquitous use of needle valves, their aerodynamics has never been really systematically investigated. Recent uses for extreme conditions, such as those in the new field of additive manufacturing, put great relevance on accumulating aerodynamic research data. This third part of a trilogy presents results of pressure measurements on internal walls in configurations characterised by rounded needle tip and/or entrance into the exit channel.
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