Design and Manufacturing of Jet to free Stream Simulator to Experimental Study of Interaction of Oblique Jet in Crossflow

Subject Areas :

Moslem Ahmadi ¹ , Mohamad Hojaji ² , Saeed Toolani ³

1 - Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 - Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
3 - Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

Received: 2015-12-13 Accepted : 2015-12-13 Published : 2015-02-01

Keywords: Wind tunnel design, Injection simulator, Jet in cross flow, Jet (injection) angle,

Abstract :

The study of interactions of jet into cross flow at different longitudinal and transverse angles of jet was studied. The following components were designed and constructed: a low velocity wind tunnel to produce the uniform flow, a flat plate with a traverse injection system to simulate the jet injection, and a spatial rake to measure the total pressure. The tests were carried out at longitudinal (α) and transverse angles (β) of 60, 75, and 90 degrees and a velocity ratio of 2.5. The free stream and jet stream velocities were set at 20 and 50 meters per second and were constant for all the tests. Results showed that flow field development could be controlled through injecting oblique jets. Decreasing β caused the following results: 1) improved the effects of injection along the mixing direction, 2) increased jet penetration along the plate width direction, and 3) increased the flow wake. In addition, decreasing α led to a slight increase downstream of the nozzle, but failed to produce a significant change in to total pressure coefficient.