Effect of physical parameters on internal flow and thermal performance of a conical Hartmann-Sprenger tube - Case study

Hartmann-Sprenger tube is a device in which an under-expanded jet enters a closed-end tube which is placed in a specific distance from the nozzle. By producing an intensive heat inside the tube in some specific modes of operation, the device could be used for some important engineering applications such as acoustic igniters. In present study, thermal performances of a set of six different case studies with conical tubes and different physical specifications are investigated. The variable parameters are the pipe material, the pipe length, the gap distance and the end wall condition which could be closed or perforated. The experimental tests in conjunction with numerical analysis are performed to evaluate the effect of changes in physical parameters on temperature rise inside the tube. The oscillatory flow with strong shock waves is the major reason of temperature rise inside the tube. As the gap distance changes, no oscillatory flow and no sensible temperature rise could be observed. Existence of a tiny hole on the tube end wall reduces the temperature rise, as the shorter tube does. The frequency of oscillations is near the tube resonance frequency for longer tubes. Tubes which made of materials with lower thermal conductivity could produce higher temperatures.