1Ph. D Scholar, Department of Mechanical Engineering, Amity University, Haryana, India
2B. Tech, Department of Mechanical Engineering, Amity University, Haryana, India
3Assistant Professor, Department of Mechanical Engineering, Amity University, Haryana, India
Online published on 8 November, 2017.
An investigation has been carried out for determining the performance of rectangular duct with inverse aspect ratio (ratio of width to height). The objective of this investigation is to frame a rectangular duct by joining the edges of two rectangles with inverse aspect ratio, to identify the pattern of flow, pressure recovery & calculation of various parameters like Reynold's number, centreline velocity, average velocity and static pressure. For performing the experiment one rectangular duct with aspect ratio 3 and centreline length 30 cm has been taken. There are 5 pressure tapping at equal intervals on each wall of the duct i.e. top, bottom, left and right. For analysing the performance of the duct graphs are drawn between P/P0 (ratio of pressure at each tapping to the pressure at the tapping at the inlet of the diffuser) and x/L (ratio of consecutive distance of each pressure tapping from the pressure tapping at the inlet of the diffuser to the centreline length of the diffuser) at 6 different velocities 28.05 m/s, 27.63 m/s, 25.68 m/s, 24.29 m/s, 19.83 m/s and 11.28 m/s. From the observations it can be concluded that pressure recovery in the left and right walls is almost same & pressure recovery in the top and bottom walls is almost same but pressure recovery is more in left and right walls with respect to top and bottom walls. Top and bottom walls act as nozzle whereas left and right walls act as diffuser.
Aspect ratio, Pressure recovery, Nozzle, diffuser, Reynold's number
