Effect of primary jet geometry on ejector performance: A cold-flow investigation

► Using a shock tube the performance of an air-ejector is examined. ► Varying the shock tube geometry changes the performance of the ejector. ► Shock waves reflected from the ejector inlet effect its efficacy. ► In some instances flow separation occurs at the ejector inlet creating a vortex ring. ► Circular shock tube creates the highest ejector impulse compared to other shapes.