Controlled flow regime transition in a dual bell nozzle by secondary radial injection

Parametrical Investigation of Transverse Injection in a Dual-Bell Nozzle During Altitude-Varying Conditions

“…In the case of radial secondary fluidic injection, significant gains could be found even for relatively small secondary mass flow rate. Indeed, a small percentage of the mainstream mass flow was sufficient for the secondary injection to increase the transition nozzle pressure ratio [27] when the injection was located downstream of the inflection point.…”

“…The presence of the injection gives birth to a separation shock, in addition to the regular shock pattern visible in conventional dual-bell nozzle studies. Using the radial secondary injection, the flow will remain detached on a longer NPR range and bring one towards the optimum transition point [12,27]. Furthermore, radial secondary injection also has a positive impact on the nozzle stability and it reduces lateral forces generation as indicated in [28].…”

“…5). The test facility was the same as described in [27]. EDITH is one of the rare nozzle testing facility offering nozzle exit pressure variations.…”

“…Geometrical details of the DBN profile obtained by an in-house code based on the method of characteristics are presented in Fig. 2, and the reader can find further details in [27,28]. The nozzle flow visualisation was made possible via the Z-Schlieren system described in [27] and a Canon EOS60D camera, recording images at a frequency of 50 Hz.…”

“…2, and the reader can find further details in [27,28]. The nozzle flow visualisation was made possible via the Z-Schlieren system described in [27] and a Canon EOS60D camera, recording images at a frequency of 50 Hz.…”