Enhancement of Supersonic Mixing with the help of Pulsed Injection

````` Keeping enhancement of supersonic mixing as prime aim, pulsed injection into supersonic flow is experimentally investigated and is presented in this paper. In the present study, eight combinations of frequencies and pulse widths (ON time) were used and the results were compared with the results of continuous injection. To understand the effect of pulse width on mixing of gaseous injectant with the core supersonic flow under the various operating conditions, Mie scattering images were taken at various downstream locations from the point of injection. Mixing is quantified by calculating the mole fraction distribution and by estimating the five parameters namely Degree of Unmixedness (DU), Mixed Area (MA), Weighted Area of Mixing (WAM), Penetration Depth (PD) and Spread. It is found that pulsed injection gives better mixing than continuous injection and that mixing is enhanced as pulse width decreases.