2019 IEEE 6th International Conference on Engineering Technologies and Applied Sciences (ICETAS) | 2019
Experimental Investigation of Wall Pressure Distribution in a Suddenly Expanded Duct from a Convergent-Divergent Nozzle
Abstract
This study focusses attention on the flow development in the duct, whose diameter ratio is 1.6. Experimental investigation was done carried out in an open jet facility using the internal flow apparatus. Since the tiny jets were used as the control mechanism hence, it was mandatory on our part to study the flow development, nature of the flow field, and the wall pressure in an abruptly expanded axisymmetric passage. The objective was to be accomplished through this; the air injection was done through the circular orifice at four locations at the base in the recirculation zone. The nozzle exit Mach number was 2.5, and the area ratio was 2.56. The maximum length of the suddenly expanded duct was 10D, where D was 16 mm. Nozzles were operated with NPR in the range from 3 to 11. It is found that the active control in the form of blowing through micro-jets is from the present investigation, it is evident that for a given Mach number and NPR, one can identify the L/D.