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

Effect of primary jet geometry on ejector performance: A cold-flow investigation,10.1016/j.ijheatfluidflow.2011.02.013,International Journal of Heat a

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Effect of primary jet geometry on ejector performance: A cold-flow investigation  
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The following cold-flow study examines the interaction of the diffracted shock wave pattern and the resulting vortex loop emitted from a shock tube of various geometries, with an ejector having a round bell-shaped inlet. The focus of the study is to examine the performance of the ejector when using different jet geometries (primary flow) to entrain secondary flow through the ejector. These include two circular nozzles with internal diameters of 15mm and 30mm, two elliptical nozzles with minor to major axis ratios of a/b=0.4 and 0.6 with b=30mm, a square nozzle with side lengths of 30mm, and two exotic nozzles resembling a pair of lips with axis ratios of a/b=0.2 and 0.5 with b=30mm. Shock tube driver pressures of P4=4, 8, and 12bar were studied, with the pressure of the shock tube driven section P1 being atmospheric. High-speed schlieren photography using the Shimadzu Hypervision camera along with detailed pressure measurements along the ejector and the impulse created by the ejector were conducted.
Journal: International Journal of Heat and Fluid Flow - INT J HEAT FLUID FLOW , vol. 32, no. 3, pp. 596-607, 2011
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