Affiliation:
1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China
2. Shaanxi Institute of Technology, Shaanxi, China
3. School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran
Abstract
Experimental and numerical analysis of active and passive flow control is an important topic of practical value in the study of turbulent flows. This paper numerically analyzed the effects of an air microjet on an adverse pressure gradient turbulent boundary layer over a flat plane. Experimental data were employed to verify the numerical modeling. Vortex formation and development were then studied by changing the microjet to inflow velocity ratio (VR) and microjet angles. According to the results, the best values of the angles [Formula: see text] and [Formula: see text] for various velocities were found to be 30° and from 60° to 90°, respectively. Moreover, at VRs = 1, 2, and 4, the [Formula: see text] values (the distance at which the complete vortex persisted in the flow) were 0.058, 0.078, and 0.18, respectively. Compared to VR = 1, the vortex strength for VRs = 2 and 4 grew by 3.5 and 6.8 times, respectively. When the microjet was added to the flow, the highest variation in the Reynolds stress along the x-direction from VR = 1–4 was 10%. The corresponding values along the y and z- directions were 15% and 2.7 times, respectively.
Reference21 articles.
1. Anderson JJFoa. Introduction to the fundamental principles and equations of viscous flow. 3rd ed. New York, NY: McGraw-Hill, 2001, pp.713–744.
2. Numerical study of minute vortex generator jets in a turbulent boundary layer
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献